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[Bug 1036427] Re: unreliability with Centrino Ultimate-N 6300 wireless connection, 802.11n

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Cut from Bug Description.

** Attachment added: "kernel-log"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1036427/+attachment/3768745/+files/kernel-log

** Description changed:

  My laptop has been experiencing occasional drops from the 802.11n
  wireless with the current kernel.  When this happens, the card cannot
  see any ESSIDs and spews the error "Request scan called when driver not
  ready."  If I try to unload and reload the module, I get an "unable to
  init EEPROM" error.
  
- Kernel log snippet follows below.  The modprobe -r/modprobe happens at
- 13:25:39.  Rebooting clears the error.
- 
- Aug 13 13:24:27 virgil kernel: [589839.617753] iwlwifi 0000:02:00.0: Queue 11 stuck for 2000 ms.
- Aug 13 13:24:27 virgil kernel: [589839.617762] iwlwifi 0000:02:00.0: Current SW read_ptr 237 write_ptr 240
- Aug 13 13:24:27 virgil kernel: [589839.635970] ------------[ cut here ]------------
- Aug 13 13:24:27 virgil kernel: [589839.636016] WARNING: at /build/buildd/linux-3.5.0/drivers/net/wireless/iwlwifi/iwl-io.c:127 iwl_grab_nic_access+0x7e/0x90 [iwlwifi]()
- Aug 13 13:24:27 virgil kernel: [589839.636019] Hardware name: 3249CTO
- Aug 13 13:24:27 virgil kernel: [589839.636021] Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff)
- Aug 13 13:24:27 virgil kernel: [589839.636120]  dm_crypt raid10 raid456 async_pq async_xor xor async_memcpy async_raid6_recov raid6_pq async_tx raid1 raid0 multipath linear dm_sna
- pshot ghash_clmulni_intel ums_realtek uas aesni_intel cryptd aes_x86_64 wmi i915 drm_kms_helper drm i2c_algo_bit video e1000e usb_storage
- Aug 13 13:24:27 virgil kernel: [589839.636156] Pid: 0, comm: swapper/0 Not tainted 3.5.0-8-generic #8-Ubuntu
- Aug 13 13:24:27 virgil kernel: [589839.636158] Call Trace:
- Aug 13 13:24:27 virgil kernel: [589839.636161]  <IRQ>  [<ffffffff81051bdf>] warn_slowpath_common+0x7f/0xc0
- Aug 13 13:24:27 virgil kernel: [589839.636176]  [<ffffffff81051cd6>] warn_slowpath_fmt+0x46/0x50
- Aug 13 13:24:27 virgil kernel: [589839.636196]  [<ffffffffa0403cd1>] ? iwl_grab_nic_access_silent+0xe1/0x120 [iwlwifi]
- Aug 13 13:24:27 virgil kernel: [589839.636213]  [<ffffffffa0403d8e>] iwl_grab_nic_access+0x7e/0x90 [iwlwifi]
- Aug 13 13:24:27 virgil kernel: [589839.636230]  [<ffffffffa040404b>] iwl_read_prph+0x3b/0xf0 [iwlwifi]
- Aug 13 13:24:27 virgil kernel: [589839.636249]  [<ffffffffa0414cc0>] iwl_trans_pcie_queue_stuck_timer+0xc0/0x180 [iwlwifi]
- Aug 13 13:24:27 virgil kernel: [589839.636268]  [<ffffffffa0414c00>] ? iwl_trans_pcie_reclaim+0x120/0x120 [iwlwifi]
- Aug 13 13:24:27 virgil kernel: [589839.636275]  [<ffffffff8106312d>] run_timer_softirq+0x13d/0x340
- Aug 13 13:24:27 virgil kernel: [589839.636279]  [<ffffffff8105a726>] __do_softirq+0xb6/0x1d0
- Aug 13 13:24:27 virgil kernel: [589839.636286]  [<ffffffff8108a2de>] ? sched_clock_idle_wakeup_event+0x1e/0x20
- Aug 13 13:24:27 virgil kernel: [589839.636292]  [<ffffffff81689a9c>] call_softirq+0x1c/0x30
- Aug 13 13:24:27 virgil kernel: [589839.636299]  [<ffffffff81015115>] do_softirq+0x75/0xb0
- Aug 13 13:24:27 virgil kernel: [589839.636303]  [<ffffffff8105aaf5>] irq_exit+0xa5/0xb0
- Aug 13 13:24:27 virgil kernel: [589839.636308]  [<ffffffff810853c2>] scheduler_ipi+0x62/0x120
- Aug 13 13:24:27 virgil kernel: [589839.636314]  [<ffffffff8103292a>] smp_reschedule_interrupt+0x2a/0x30
- Aug 13 13:24:27 virgil kernel: [589839.636321]  [<ffffffff8168964a>] reschedule_interrupt+0x6a/0x70
- Aug 13 13:24:27 virgil kernel: [589839.636323]  <EOI>  [<ffffffff8138fd5a>] ? intel_idle+0xea/0x150
- Aug 13 13:24:27 virgil kernel: [589839.636335]  [<ffffffff8138fd3b>] ? intel_idle+0xcb/0x150
- Aug 13 13:24:27 virgil kernel: [589839.636343]  [<ffffffff81525e19>] cpuidle_enter+0x19/0x20
- Aug 13 13:24:27 virgil kernel: [589839.636348]  [<ffffffff81526449>] cpuidle_idle_call+0xa9/0x240
- Aug 13 13:24:27 virgil kernel: [589839.636354]  [<ffffffff8101c48f>] cpu_idle+0xaf/0x120
- Aug 13 13:24:27 virgil kernel: [589839.636362]  [<ffffffff8164dbee>] rest_init+0x72/0x74
- Aug 13 13:24:27 virgil kernel: [589839.636369]  [<ffffffff81cf3bdf>] start_kernel+0x3b7/0x3c4
- Aug 13 13:24:27 virgil kernel: [589839.636373]  [<ffffffff81cf3677>] ? do_early_param+0x91/0x91
- Aug 13 13:24:27 virgil kernel: [589839.636378]  [<ffffffff81cf3356>] x86_64_start_reservations+0x131/0x135
- Aug 13 13:24:27 virgil kernel: [589839.636382]  [<ffffffff81cf345a>] x86_64_start_kernel+0x100/0x10f
- Aug 13 13:24:27 virgil kernel: [589839.636385] ---[ end trace 122a7e44f5b9b8e9 ]---
- Aug 13 13:24:27 virgil kernel: [589839.654714] iwlwifi 0000:02:00.0: Current HW read_ptr 255 write_ptr -1
- Aug 13 13:24:27 virgil kernel: [589839.654721] iwlwifi 0000:02:00.0: Loaded firmware version: 9.221.4.1 build 25532
- Aug 13 13:24:27 virgil kernel: [589839.672960] iwlwifi 0000:02:00.0: Start IWL Error Log Dump:
- Aug 13 13:24:27 virgil kernel: [589839.672968] iwlwifi 0000:02:00.0: Status: 0x0000005C, count: -1
- Aug 13 13:24:27 virgil kernel: [589839.672974] iwlwifi 0000:02:00.0: 0x37C03D80 | ADVANCED_SYSASSERT          
- Aug 13 13:24:27 virgil kernel: [589839.672977] iwlwifi 0000:02:00.0: 0xFFFF8801 | uPc
- Aug 13 13:24:27 virgil kernel: [589839.672980] iwlwifi 0000:02:00.0: 0x37C03D40 | branchlink1
- Aug 13 13:24:27 virgil kernel: [589839.672984] iwlwifi 0000:02:00.0: 0xFFFF8801 | branchlink2
- Aug 13 13:24:27 virgil kernel: [589839.672987] iwlwifi 0000:02:00.0: 0x37C03D48 | interruptlink1
- Aug 13 13:24:27 virgil kernel: [589839.672990] iwlwifi 0000:02:00.0: 0xFFFF8801 | interruptlink2
- Aug 13 13:24:27 virgil kernel: [589839.672993] iwlwifi 0000:02:00.0: 0x00000010 | data1
- Aug 13 13:24:27 virgil kernel: [589839.672996] iwlwifi 0000:02:00.0: 0x00000000 | data2
- Aug 13 13:24:27 virgil kernel: [589839.672999] iwlwifi 0000:02:00.0: 0x37C03D88 | line
- Aug 13 13:24:27 virgil kernel: [589839.673003] iwlwifi 0000:02:00.0: 0xFFFF8801 | beacon time
- Aug 13 13:24:27 virgil kernel: [589839.673006] iwlwifi 0000:02:00.0: 0xA043331A | tsf low
- Aug 13 13:24:27 virgil kernel: [589839.673009] iwlwifi 0000:02:00.0: 0xFFFFFFFF | tsf hi
- Aug 13 13:24:27 virgil kernel: [589839.673012] iwlwifi 0000:02:00.0: 0x2CB4B204 | time gp1
- Aug 13 13:24:27 virgil kernel: [589839.673015] iwlwifi 0000:02:00.0: 0xFFFF8801 | time gp2
- Aug 13 13:24:27 virgil kernel: [589839.673018] iwlwifi 0000:02:00.0: 0x00000000 | time gp3
- Aug 13 13:24:27 virgil kernel: [589839.673021] iwlwifi 0000:02:00.0: 0x00000000 | uCode version
- Aug 13 13:24:27 virgil kernel: [589839.673025] iwlwifi 0000:02:00.0: 0x37C03DF0 | hw version
- Aug 13 13:24:27 virgil kernel: [589839.673028] iwlwifi 0000:02:00.0: 0xFFFF8801 | board version
- Aug 13 13:24:27 virgil kernel: [589839.673031] iwlwifi 0000:02:00.0: 0x00000000 | hcmd
- Aug 13 13:24:27 virgil kernel: [589839.673034] iwlwifi 0000:02:00.0: 0xA043331A | isr0
- Aug 13 13:24:27 virgil kernel: [589839.673037] iwlwifi 0000:02:00.0: 0xFFFFFFFF | isr1
- Aug 13 13:24:27 virgil kernel: [589839.673041] iwlwifi 0000:02:00.0: 0x37C03D98 | isr2
- Aug 13 13:24:27 virgil kernel: [589839.673044] iwlwifi 0000:02:00.0: 0xFFFF8801 | isr3
- Aug 13 13:24:27 virgil kernel: [589839.673047] iwlwifi 0000:02:00.0: 0x00000020 | isr4
- Aug 13 13:24:27 virgil kernel: [589839.673050] iwlwifi 0000:02:00.0: 0xFFFFFFFF | isr_pref
- Aug 13 13:24:27 virgil kernel: [589839.673053] iwlwifi 0000:02:00.0: 0x37C03E00 | wait_event
- Aug 13 13:24:27 virgil kernel: [589839.673057] iwlwifi 0000:02:00.0: 0xFFFF8801 | l2p_control
- Aug 13 13:24:27 virgil kernel: [589839.673060] iwlwifi 0000:02:00.0: 0x37C03DB0 | l2p_duration
- Aug 13 13:24:27 virgil kernel: [589839.673063] iwlwifi 0000:02:00.0: 0xFFFF8801 | l2p_mhvalid
- Aug 13 13:24:27 virgil kernel: [589839.673066] iwlwifi 0000:02:00.0: 0x37C03DB8 | l2p_addr_match
- Aug 13 13:24:27 virgil kernel: [589839.673069] iwlwifi 0000:02:00.0: 0xFFFF8801 | lmpm_pmg_sel
- Aug 13 13:24:27 virgil kernel: [589839.673073] iwlwifi 0000:02:00.0: 0x00000020 | timestamp
- Aug 13 13:24:27 virgil kernel: [589839.673076] iwlwifi 0000:02:00.0: 0xFFFF8801 | flow_handler
- Aug 13 13:24:27 virgil kernel: [589839.746201] iwlwifi 0000:02:00.0: Log capacity -1 is bogus, limit to 512 entries
- Aug 13 13:24:27 virgil kernel: [589839.746212] iwlwifi 0000:02:00.0: Log write index -1 is bogus, limit to 512
- Aug 13 13:24:27 virgil kernel: [589839.746218] iwlwifi 0000:02:00.0: Start IWL Event Log Dump: display last 20 entries
- Aug 13 13:24:28 virgil kernel: [589840.479566] iwlwifi 0000:02:00.0: Queue 0 stuck for 2000 ms.
- Aug 13 13:24:28 virgil kernel: [589840.479577] iwlwifi 0000:02:00.0: Current SW read_ptr 210 write_ptr 211
- Aug 13 13:24:28 virgil kernel: [589840.479590] iwlwifi 0000:02:00.0: fail to flush all tx fifo queues
- Aug 13 13:24:28 virgil kernel: [589840.534283] iwlwifi 0000:02:00.0: Current HW read_ptr 255 write_ptr -1
- Aug 13 13:24:28 virgil kernel: [589840.534290] iwlwifi 0000:02:00.0: Loaded firmware version: 9.221.4.1 build 25532
- Aug 13 13:24:28 virgil kernel: [589840.570748] iwlwifi 0000:02:00.0: Start IWL Error Log Dump:
- Aug 13 13:24:28 virgil kernel: [589840.570761] iwlwifi 0000:02:00.0: Status: 0x00000054, count: -1
- Aug 13 13:24:28 virgil kernel: [589840.570765] iwlwifi 0000:02:00.0: 0x37D83D90 | ADVANCED_SYSASSERT          
- Aug 13 13:24:28 virgil kernel: [589840.570769] iwlwifi 0000:02:00.0: 0xFFFF8801 | uPc
- Aug 13 13:24:28 virgil kernel: [589840.570772] iwlwifi 0000:02:00.0: 0x37D83D50 | branchlink1
- Aug 13 13:24:28 virgil kernel: [589840.570775] iwlwifi 0000:02:00.0: 0xFFFF8801 | branchlink2
- Aug 13 13:24:28 virgil kernel: [589840.570778] iwlwifi 0000:02:00.0: 0x37D83D58 | interruptlink1
- Aug 13 13:24:28 virgil kernel: [589840.570782] iwlwifi 0000:02:00.0: 0xFFFF8801 | interruptlink2
- Aug 13 13:24:28 virgil kernel: [589840.570785] iwlwifi 0000:02:00.0: 0x00000010 | data1
- Aug 13 13:24:28 virgil kernel: [589840.570788] iwlwifi 0000:02:00.0: 0x00000000 | data2
- Aug 13 13:24:28 virgil kernel: [589840.570791] iwlwifi 0000:02:00.0: 0x37D83D98 | line
- Aug 13 13:24:28 virgil kernel: [589840.570794] iwlwifi 0000:02:00.0: 0xFFFF8801 | beacon time
- Aug 13 13:24:28 virgil kernel: [589840.570802] iwlwifi 0000:02:00.0: 0xA043331A | tsf low
- Aug 13 13:24:28 virgil kernel: [589840.570811] iwlwifi 0000:02:00.0: 0xFFFFFFFF | tsf hi
- Aug 13 13:24:28 virgil kernel: [589840.570819] iwlwifi 0000:02:00.0: 0x2CB4B204 | time gp1
- Aug 13 13:24:28 virgil kernel: [589840.570827] iwlwifi 0000:02:00.0: 0xFFFF8801 | time gp2
- Aug 13 13:24:28 virgil kernel: [589840.570830] iwlwifi 0000:02:00.0: 0x00000000 | time gp3
- Aug 13 13:24:28 virgil kernel: [589840.570833] iwlwifi 0000:02:00.0: 0x00000000 | uCode version
- Aug 13 13:24:28 virgil kernel: [589840.570837] iwlwifi 0000:02:00.0: 0x37D83E00 | hw version
- Aug 13 13:24:28 virgil kernel: [589840.570840] iwlwifi 0000:02:00.0: 0xFFFF8801 | board version
- Aug 13 13:24:28 virgil kernel: [589840.570843] iwlwifi 0000:02:00.0: 0x00000000 | hcmd
- Aug 13 13:24:28 virgil kernel: [589840.570846] iwlwifi 0000:02:00.0: 0xA043331A | isr0
- Aug 13 13:24:28 virgil kernel: [589840.570849] iwlwifi 0000:02:00.0: 0xFFFFFFFF | isr1
- Aug 13 13:24:28 virgil kernel: [589840.570852] iwlwifi 0000:02:00.0: 0x37D83DA8 | isr2
- Aug 13 13:24:28 virgil kernel: [589840.570855] iwlwifi 0000:02:00.0: 0xFFFF8801 | isr3
- Aug 13 13:24:28 virgil kernel: [589840.570859] iwlwifi 0000:02:00.0: 0x00000020 | isr4
- Aug 13 13:24:28 virgil kernel: [589840.570862] iwlwifi 0000:02:00.0: 0xFFFFFFFF | isr_pref
- Aug 13 13:24:28 virgil kernel: [589840.570865] iwlwifi 0000:02:00.0: 0x37D83E10 | wait_event
- Aug 13 13:24:28 virgil kernel: [589840.570868] iwlwifi 0000:02:00.0: 0xFFFF8801 | l2p_control
- Aug 13 13:24:28 virgil kernel: [589840.570871] iwlwifi 0000:02:00.0: 0x37D83DC0 | l2p_duration
- Aug 13 13:24:28 virgil kernel: [589840.570879] iwlwifi 0000:02:00.0: 0xFFFF8801 | l2p_mhvalid
- Aug 13 13:24:28 virgil kernel: [589840.570888] iwlwifi 0000:02:00.0: 0x37D83DC8 | l2p_addr_match
- Aug 13 13:24:28 virgil kernel: [589840.570899] iwlwifi 0000:02:00.0: 0xFFFF8801 | lmpm_pmg_sel
- Aug 13 13:24:28 virgil kernel: [589840.570909] iwlwifi 0000:02:00.0: 0x00000020 | timestamp
- Aug 13 13:24:28 virgil kernel: [589840.570916] iwlwifi 0000:02:00.0: 0xFFFF8801 | flow_handler
- Aug 13 13:24:28 virgil kernel: [589840.716729] iwlwifi 0000:02:00.0: Log capacity -1 is bogus, limit to 512 entries
- Aug 13 13:24:28 virgil kernel: [589840.716735] iwlwifi 0000:02:00.0: Log write index -1 is bogus, limit to 512
- Aug 13 13:24:28 virgil kernel: [589840.716739] iwlwifi 0000:02:00.0: Start IWL Event Log Dump: display last 20 entries
- Aug 13 13:24:28 virgil kernel: [589840.990654] ieee80211 phy0: Hardware restart was requested
- Aug 13 13:24:28 virgil kernel: [589840.990704] ieee80211 phy0: Hardware restart was requested
- Aug 13 13:24:28 virgil kernel: [589840.991559] ------------[ cut here ]------------
- Aug 13 13:24:28 virgil kernel: [589840.991604] WARNING: at /build/buildd/linux-3.5.0/drivers/net/wireless/iwlwifi/iwl-trans.h:518 iwl_dvm_send_cmd+0x130/0x140 [iwlwifi]()
- Aug 13 13:24:28 virgil kernel: [589840.991607] Hardware name: 3249CTO
- Aug 13 13:24:28 virgil kernel: [589840.991609] iwl_trans_send_cmd bad state = 0
- Aug 13 13:24:28 virgil kernel: [589840.991612] Modules linked in:<4>[589840.991710]  raid456 async_pq async_xor xor async_memcpy async_raid6_recov raid6_pq async_tx raid1 raid0 multipath linear dm_snapshot ghash_clmulni_intel ums_realtek uas aesni_intel cryptd aes_x86_64 wmi i915 drm_kms_helper drm i2c_algo_bit video e1000e usb_storage
- Aug 13 13:24:28 virgil kernel: [589840.991744] Pid: 1078, comm: kworker/u:0 Tainted: G        W    3.5.0-8-generic #8-Ubuntu
- Aug 13 13:24:28 virgil kernel: [589840.991746] Call Trace:
- Aug 13 13:24:28 virgil kernel: [589840.991758]  [<ffffffff81051bdf>] warn_slowpath_common+0x7f/0xc0
- Aug 13 13:24:28 virgil kernel: [589840.991763]  [<ffffffff81051cd6>] warn_slowpath_fmt+0x46/0x50
- Aug 13 13:24:28 virgil kernel: [589840.991784]  [<ffffffffa04011f0>] iwl_dvm_send_cmd+0x130/0x140 [iwlwifi]
- Aug 13 13:24:28 virgil kernel: [589840.991802]  [<ffffffffa04063e6>] iwl_send_add_sta+0xd6/0x120 [iwlwifi]
- Aug 13 13:24:28 virgil kernel: [589840.991822]  [<ffffffffa0408c4b>] iwl_sta_rx_agg_stop+0x12b/0x190 [iwlwifi]
- Aug 13 13:24:28 virgil kernel: [589840.991837]  [<ffffffffa03fb0ef>] iwlagn_mac_ampdu_action+0x2af/0x310 [iwlwifi]
- Aug 13 13:24:28 virgil kernel: [589840.991861]  [<ffffffffa03449b4>] ___ieee80211_stop_rx_ba_session+0xc4/0x230 [mac80211]
- Aug 13 13:24:28 virgil kernel: [589840.991881]  [<ffffffffa0344b79>] __ieee80211_stop_rx_ba_session+0x59/0x80 [mac80211]
- Aug 13 13:24:28 virgil kernel: [589840.991901]  [<ffffffffa0342b89>] ieee80211_sta_tear_down_BA_sessions+0x59/0x70 [mac80211]
- Aug 13 13:24:28 virgil kernel: [589840.991928]  [<ffffffffa0372f7b>] ieee80211_set_disassoc+0xeb/0x3f0 [mac80211]
- Aug 13 13:24:28 virgil kernel: [589840.991953]  [<ffffffffa03732cd>] ieee80211_sta_connection_lost.isra.16+0x4d/0xc0 [mac80211]
- Aug 13 13:24:28 virgil kernel: [589840.991978]  [<ffffffffa0375a62>] ieee80211_sta_work+0x162/0x370 [mac80211]
- Aug 13 13:24:28 virgil kernel: [589840.991998]  [<ffffffffa0348429>] ieee80211_iface_work+0x2c9/0x360 [mac80211]
- Aug 13 13:24:28 virgil kernel: [589840.992004]  [<ffffffff8107073a>] process_one_work+0x12a/0x420
- Aug 13 13:24:28 virgil kernel: [589840.992024]  [<ffffffffa0348160>] ? ieee80211_check_queues+0x100/0x100 [mac80211]
- Aug 13 13:24:28 virgil kernel: [589840.992029]  [<ffffffff810712de>] worker_thread+0x12e/0x2f0
- Aug 13 13:24:28 virgil kernel: [589840.992033]  [<ffffffff810711b0>] ? manage_workers.isra.25+0x200/0x200
- Aug 13 13:24:28 virgil kernel: [589840.992039]  [<ffffffff810761d3>] kthread+0x93/0xa0
- Aug 13 13:24:28 virgil kernel: [589840.992045]  [<ffffffff816899a4>] kernel_thread_helper+0x4/0x10
- Aug 13 13:24:28 virgil kernel: [589840.992050]  [<ffffffff81076140>] ? flush_kthread_worker+0x80/0x80
- Aug 13 13:24:28 virgil kernel: [589840.992054]  [<ffffffff816899a0>] ? gs_change+0x13/0x13
- Aug 13 13:24:28 virgil kernel: [589840.992056] ---[ end trace 122a7e44f5b9b8ea ]---
- Aug 13 13:24:30 virgil kernel: [589842.985291] iwlwifi 0000:02:00.0: Error sending REPLY_ADD_STA: time out after 2000ms.
- Aug 13 13:24:30 virgil kernel: [589842.985301] iwlwifi 0000:02:00.0: Current CMD queue read_ptr 26 write_ptr 27
- Aug 13 13:24:30 virgil kernel: [589842.985309] HW problem - can not stop rx aggregation for tid 0
- Aug 13 13:24:30 virgil kernel: [589842.989286] iwlwifi 0000:02:00.0: Queue 4 stuck for 2000 ms.
- Aug 13 13:24:30 virgil kernel: [589842.989297] iwlwifi 0000:02:00.0: Current SW read_ptr 26 write_ptr 28
- Aug 13 13:24:31 virgil kernel: [589843.025880] iwlwifi 0000:02:00.0: Current HW read_ptr 255 write_ptr -1
- Aug 13 13:24:31 virgil kernel: [589843.025890] iwlwifi 0000:02:00.0: Loaded firmware version: 9.221.4.1 build 25532
- Aug 13 13:24:31 virgil kernel: [589843.044141] iwlwifi 0000:02:00.0: Start IWL Error Log Dump:
- Aug 13 13:24:31 virgil kernel: [589843.044150] iwlwifi 0000:02:00.0: Status: 0x00000010, count: -1
- Aug 13 13:24:31 virgil kernel: [589843.044156] iwlwifi 0000:02:00.0: 0x37C03D90 | ADVANCED_SYSASSERT          
- Aug 13 13:24:31 virgil kernel: [589843.044160] iwlwifi 0000:02:00.0: 0xFFFF8801 | uPc
- Aug 13 13:24:31 virgil kernel: [589843.044163] iwlwifi 0000:02:00.0: 0x37C03D50 | branchlink1
- Aug 13 13:24:31 virgil kernel: [589843.044167] iwlwifi 0000:02:00.0: 0xFFFF8801 | branchlink2
- Aug 13 13:24:31 virgil kernel: [589843.044172] iwlwifi 0000:02:00.0: 0x37C03D58 | interruptlink1
- Aug 13 13:24:31 virgil kernel: [589843.044176] iwlwifi 0000:02:00.0: 0xFFFF8801 | interruptlink2
- Aug 13 13:24:31 virgil kernel: [589843.044180] iwlwifi 0000:02:00.0: 0x00000010 | data1
- Aug 13 13:24:31 virgil kernel: [589843.044186] iwlwifi 0000:02:00.0: 0x00000000 | data2
- Aug 13 13:24:31 virgil kernel: [589843.044190] iwlwifi 0000:02:00.0: 0x37C03D98 | line
- Aug 13 13:24:31 virgil kernel: [589843.044197] iwlwifi 0000:02:00.0: 0xFFFF8801 | beacon time
- Aug 13 13:24:31 virgil kernel: [589843.044205] iwlwifi 0000:02:00.0: 0xA043331A | tsf low
- Aug 13 13:24:31 virgil kernel: [589843.044214] iwlwifi 0000:02:00.0: 0xFFFFFFFF | tsf hi
- Aug 13 13:24:31 virgil kernel: [589843.044222] iwlwifi 0000:02:00.0: 0x2CB4B204 | time gp1
- Aug 13 13:24:31 virgil kernel: [589843.044229] iwlwifi 0000:02:00.0: 0xFFFF8801 | time gp2
- Aug 13 13:24:31 virgil kernel: [589843.044235] iwlwifi 0000:02:00.0: 0x00000001 | time gp3
- Aug 13 13:24:31 virgil kernel: [589843.044239] iwlwifi 0000:02:00.0: 0x00000000 | uCode version
- Aug 13 13:24:31 virgil kernel: [589843.044245] iwlwifi 0000:02:00.0: 0x37C03E00 | hw version
- Aug 13 13:24:31 virgil kernel: [589843.044250] iwlwifi 0000:02:00.0: 0xFFFF8801 | board version
- Aug 13 13:24:31 virgil kernel: [589843.044255] iwlwifi 0000:02:00.0: 0x00000000 | hcmd
- Aug 13 13:24:31 virgil kernel: [589843.044260] iwlwifi 0000:02:00.0: 0xA043331A | isr0
- Aug 13 13:24:31 virgil kernel: [589843.044265] iwlwifi 0000:02:00.0: 0xFFFFFFFF | isr1
- Aug 13 13:24:31 virgil kernel: [589843.044270] iwlwifi 0000:02:00.0: 0x37C03DA8 | isr2
- Aug 13 13:24:31 virgil kernel: [589843.044275] iwlwifi 0000:02:00.0: 0xFFFF8801 | isr3
- Aug 13 13:24:31 virgil kernel: [589843.044280] iwlwifi 0000:02:00.0: 0x00000020 | isr4
- Aug 13 13:24:31 virgil kernel: [589843.044285] iwlwifi 0000:02:00.0: 0xFFFFFFFF | isr_pref
- Aug 13 13:24:31 virgil kernel: [589843.044295] iwlwifi 0000:02:00.0: 0x37C03E10 | wait_event
- Aug 13 13:24:31 virgil kernel: [589843.044303] iwlwifi 0000:02:00.0: 0xFFFF8801 | l2p_control
- Aug 13 13:24:31 virgil kernel: [589843.044311] iwlwifi 0000:02:00.0: 0x37C03DC0 | l2p_duration
- Aug 13 13:24:31 virgil kernel: [589843.044321] iwlwifi 0000:02:00.0: 0xFFFF8801 | l2p_mhvalid
- Aug 13 13:24:31 virgil kernel: [589843.044327] iwlwifi 0000:02:00.0: 0x37C03DC8 | l2p_addr_match
- Aug 13 13:24:31 virgil kernel: [589843.044332] iwlwifi 0000:02:00.0: 0xFFFF8801 | lmpm_pmg_sel
- Aug 13 13:24:31 virgil kernel: [589843.044337] iwlwifi 0000:02:00.0: 0x00000020 | timestamp
- Aug 13 13:24:31 virgil kernel: [589843.044341] iwlwifi 0000:02:00.0: 0xFFFF8801 | flow_handler
- Aug 13 13:24:31 virgil kernel: [589843.117645] iwlwifi 0000:02:00.0: Log capacity -1 is bogus, limit to 512 entries
- Aug 13 13:24:31 virgil kernel: [589843.117653] iwlwifi 0000:02:00.0: Log write index -1 is bogus, limit to 512
- Aug 13 13:24:31 virgil kernel: [589843.117657] iwlwifi 0000:02:00.0: Start IWL Event Log Dump: display last 20 entries
- Aug 13 13:24:32 virgil kernel: [589844.980314] iwlwifi 0000:02:00.0: Error sending REPLY_ADD_STA: time out after 2000ms.
- Aug 13 13:24:32 virgil kernel: [589844.980329] iwlwifi 0000:02:00.0: Current CMD queue read_ptr 26 write_ptr 28
- Aug 13 13:24:32 virgil kernel: [589844.980339] HW problem - can not stop rx aggregation for tid 3
- Aug 13 13:24:32 virgil kernel: [589844.980388] ieee80211 phy0: Hardware restart was requested
- Aug 13 13:24:34 virgil kernel: [589846.975279] iwlwifi 0000:02:00.0: Error sending REPLY_ADD_STA: time out after 2000ms.
- Aug 13 13:24:34 virgil kernel: [589846.975287] iwlwifi 0000:02:00.0: Current CMD queue read_ptr 26 write_ptr 29
- Aug 13 13:24:34 virgil kernel: [589846.975292] HW problem - can not stop rx aggregation for tid 4
- Aug 13 13:24:34 virgil kernel: [589846.985570] ------------[ cut here ]------------
- Aug 13 13:24:34 virgil kernel: [589846.985614] WARNING: at /build/buildd/linux-3.5.0/drivers/net/wireless/iwlwifi/iwl-trans.h:565 iwlagn_mac_flush+0x1a3/0x1b0 [iwlwifi]()
- Aug 13 13:24:34 virgil kernel: [589846.985619] Hardware name: 3249CTO
- Aug 13 13:24:34 virgil kernel: [589846.985622] iwl_trans_wait_tx_queue_empty bad state = 0
- Aug 13 13:24:34 virgil kernel: [589846.985624] Modules linked in:<4>[589846.985727]  raid456 async_pq async_xor xor async_memcpy async_raid6_recov raid6_pq async_tx raid1 raid0 multipath linear dm_snapshot ghash_clmulni_intel ums_realtek uas aesni_intel cryptd aes_x86_64 wmi i915 drm_kms_helper drm i2c_algo_bit video e1000e usb_storage
- Aug 13 13:24:34 virgil kernel: [589846.985760] Pid: 1078, comm: kworker/u:0 Tainted: G        W    3.5.0-8-generic #8-Ubuntu
- Aug 13 13:24:34 virgil kernel: [589846.985762] Call Trace:
- Aug 13 13:24:34 virgil kernel: [589846.985776]  [<ffffffff81051bdf>] warn_slowpath_common+0x7f/0xc0
- Aug 13 13:24:34 virgil kernel: [589846.985782]  [<ffffffff81051cd6>] warn_slowpath_fmt+0x46/0x50
- Aug 13 13:24:34 virgil kernel: [589846.985803]  [<ffffffffa03fabe3>] iwlagn_mac_flush+0x1a3/0x1b0 [iwlwifi]
- Aug 13 13:24:34 virgil kernel: [589846.985830]  [<ffffffffa0349638>] __ieee80211_recalc_idle+0x278/0x2f0 [mac80211]
- Aug 13 13:24:34 virgil kernel: [589846.985853]  [<ffffffffa034ad03>] ieee80211_recalc_idle+0x33/0x60 [mac80211]
- Aug 13 13:24:34 virgil kernel: [589846.985878]  [<ffffffffa0373302>] ieee80211_sta_connection_lost.isra.16+0x82/0xc0 [mac80211]
- Aug 13 13:24:34 virgil kernel: [589846.985904]  [<ffffffffa0375a62>] ieee80211_sta_work+0x162/0x370 [mac80211]
- Aug 13 13:24:34 virgil kernel: [589846.985924]  [<ffffffffa0348429>] ieee80211_iface_work+0x2c9/0x360 [mac80211]
- Aug 13 13:24:34 virgil kernel: [589846.985929]  [<ffffffff8107073a>] process_one_work+0x12a/0x420
- Aug 13 13:24:34 virgil kernel: [589846.985949]  [<ffffffffa0348160>] ? ieee80211_check_queues+0x100/0x100 [mac80211]
- Aug 13 13:24:34 virgil kernel: [589846.985954]  [<ffffffff810712de>] worker_thread+0x12e/0x2f0
- Aug 13 13:24:34 virgil kernel: [589846.985959]  [<ffffffff810711b0>] ? manage_workers.isra.25+0x200/0x200
- Aug 13 13:24:34 virgil kernel: [589846.985965]  [<ffffffff810761d3>] kthread+0x93/0xa0
- Aug 13 13:24:34 virgil kernel: [589846.985971]  [<ffffffff816899a4>] kernel_thread_helper+0x4/0x10
- Aug 13 13:24:34 virgil kernel: [589846.985976]  [<ffffffff81076140>] ? flush_kthread_worker+0x80/0x80
- Aug 13 13:24:34 virgil kernel: [589846.985979]  [<ffffffff816899a0>] ? gs_change+0x13/0x13
- Aug 13 13:24:34 virgil kernel: [589846.985982] ---[ end trace 122a7e44f5b9b8eb ]---
- Aug 13 13:24:34 virgil kernel: [589846.986028] cfg80211: All devices are disconnected, going to restore regulatory settings
- Aug 13 13:24:34 virgil kernel: [589846.986035] cfg80211: Restoring regulatory settings
- Aug 13 13:24:34 virgil kernel: [589846.986041] cfg80211: Calling CRDA to update world regulatory domain
- Aug 13 13:24:34 virgil kernel: [589846.986064] iwlwifi 0000:02:00.0: L1 Disabled; Enabling L0S
- Aug 13 13:24:35 virgil kernel: [589847.041003] iwlwifi 0000:02:00.0: Radio type=0x0-0x3-0x1
- Aug 13 13:24:40 virgil kernel: [589852.664939] iwlwifi 0000:02:00.0: Could not load the [0] uCode section
- Aug 13 13:24:40 virgil kernel: [589852.664948] iwlwifi 0000:02:00.0: Failed to start RT ucode: -110
- Aug 13 13:24:41 virgil kernel: [589853.029833] iwlwifi 0000:02:00.0: Unable to initialize device.
- Aug 13 13:24:41 virgil kernel: [589853.029913] iwlwifi 0000:02:00.0: L1 Disabled; Enabling L0S
- Aug 13 13:24:41 virgil kernel: [589853.084748] iwlwifi 0000:02:00.0: Radio type=0x0-0x3-0x1
- Aug 13 13:24:47 virgil kernel: [589858.709737] iwlwifi 0000:02:00.0: Could not load the [0] uCode section
- Aug 13 13:24:47 virgil kernel: [589858.709748] iwlwifi 0000:02:00.0: Failed to start RT ucode: -110
- Aug 13 13:24:47 virgil kernel: [589859.073240] iwlwifi 0000:02:00.0: Unable to initialize device.
- Aug 13 13:24:47 virgil kernel: [589859.073777] iwlwifi 0000:02:00.0: Request scan called when driver not ready.
- Aug 13 13:24:47 virgil kernel: [589859.073817] cfg80211: Ignoring regulatory request Set by core since the driver uses its own custom regulatory domain
- Aug 13 13:24:47 virgil kernel: [589859.073823] cfg80211: World regulatory domain updated:
- Aug 13 13:24:47 virgil kernel: [589859.073826] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
- Aug 13 13:24:47 virgil kernel: [589859.073831] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
- Aug 13 13:24:47 virgil kernel: [589859.073836] cfg80211:   (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
- Aug 13 13:24:47 virgil kernel: [589859.073840] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
- Aug 13 13:24:47 virgil kernel: [589859.073844] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
- Aug 13 13:24:47 virgil kernel: [589859.073847] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
- Aug 13 13:24:48 virgil kernel: [589860.074724] iwlwifi 0000:02:00.0: Request scan called when driver not ready.
- Aug 13 13:24:49 virgil kernel: [589861.073598] iwlwifi 0000:02:00.0: Request scan called when driver not ready.
- Aug 13 13:24:50 virgil kernel: [589862.072551] iwlwifi 0000:02:00.0: Request scan called when driver not ready.
- Aug 13 13:24:50 virgil kernel: [589862.606838] iwlwifi 0000:02:00.0: Request scan called when driver not ready.
- <snip>
- Aug 13 13:25:02 virgil kernel: [589874.789071] IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready
- Aug 13 13:25:05 virgil kernel: [589877.646855] iwlwifi 0000:02:00.0: Request scan called when driver not ready.
- Aug 13 13:25:06 virgil kernel: [589878.645752] iwlwifi 0000:02:00.0: Request scan called when driver not ready.
- <snip>
- Aug 13 13:25:38 virgil kernel: [589910.532947] iwlwifi 0000:02:00.0: Request scan called when driver not ready.
- Aug 13 13:25:39 virgil kernel: [589911.001660] iwlwifi: Intel(R) Wireless WiFi Link AGN driver for Linux, in-tree:
- Aug 13 13:25:39 virgil kernel: [589911.001664] iwlwifi: Copyright(c) 2003-2012 Intel Corporation
- Aug 13 13:25:39 virgil kernel: [589911.001740] iwlwifi 0000:02:00.0: enabling device (0000 -> 0002)
- Aug 13 13:25:39 virgil kernel: [589911.001789] iwlwifi 0000:02:00.0: pci_resource_len = 0x00002000
- Aug 13 13:25:39 virgil kernel: [589911.001791] iwlwifi 0000:02:00.0: pci_resource_base = ffffc900110ac000
- Aug 13 13:25:39 virgil kernel: [589911.001794] iwlwifi 0000:02:00.0: HW Revision ID = 0x35
- Aug 13 13:25:39 virgil kernel: [589911.001873] iwlwifi 0000:02:00.0: irq 44 for MSI/MSI-X
- Aug 13 13:25:39 virgil kernel: [589911.015402] iwlwifi 0000:02:00.0: loaded firmware version 9.221.4.1 build 25532
- Aug 13 13:25:39 virgil kernel: [589911.015662] iwlwifi 0000:02:00.0: CONFIG_IWLWIFI_DEBUG disabled
- Aug 13 13:25:39 virgil kernel: [589911.015665] iwlwifi 0000:02:00.0: CONFIG_IWLWIFI_DEBUGFS enabled
- Aug 13 13:25:39 virgil kernel: [589911.015667] iwlwifi 0000:02:00.0: CONFIG_IWLWIFI_DEVICE_TRACING enabled
- Aug 13 13:25:39 virgil kernel: [589911.015669] iwlwifi 0000:02:00.0: CONFIG_IWLWIFI_DEVICE_TESTMODE enabled
- Aug 13 13:25:39 virgil kernel: [589911.015671] iwlwifi 0000:02:00.0: CONFIG_IWLWIFI_P2P disabled
- Aug 13 13:25:39 virgil kernel: [589911.015673] iwlwifi 0000:02:00.0: Detected Intel(R) Centrino(R) Ultimate-N 6300 AGN, REV=0xFFFFFFFF
- Aug 13 13:25:39 virgil kernel: [589911.015730] iwlwifi 0000:02:00.0: L1 Disabled; Enabling L0S
- Aug 13 13:25:39 virgil kernel: [589911.034074] ------------[ cut here ]------------
- Aug 13 13:25:39 virgil kernel: [589911.034097] WARNING: at /build/buildd/linux-3.5.0/drivers/net/wireless/iwlwifi/iwl-io.c:127 iwl_grab_nic_access+0x7e/0x90 [iwlwifi]()
- Aug 13 13:25:39 virgil kernel: [589911.034099] Hardware name: 3249CTO
- Aug 13 13:25:39 virgil kernel: [589911.034101] Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff)
- Aug 13 13:25:39 virgil kernel: [589911.034203]  dm_crypt raid10 raid456 async_pq async_xor xor async_memcpy async_raid6_recov raid6_pq async_tx raid1 raid0 multipath linear dm_snapshot ghash_clmulni_intel ums_realtek uas aesni_intel cryptd aes_x86_64 wmi i915 drm_kms_helper drm i2c_algo_bit video e1000e usb_storage [last unloaded: mac80211]
- Aug 13 13:25:39 virgil kernel: [589911.034235] Pid: 1720, comm: kworker/1:0 Tainted: G        W    3.5.0-8-generic #8-Ubuntu
- Aug 13 13:25:39 virgil kernel: [589911.034236] Call Trace:
- Aug 13 13:25:39 virgil kernel: [589911.034247]  [<ffffffff81051bdf>] warn_slowpath_common+0x7f/0xc0
- Aug 13 13:25:39 virgil kernel: [589911.034251]  [<ffffffff81051cd6>] warn_slowpath_fmt+0x46/0x50
- Aug 13 13:25:39 virgil kernel: [589911.034263]  [<ffffffffa0348cd1>] ? iwl_grab_nic_access_silent+0xe1/0x120 [iwlwifi]
- Aug 13 13:25:39 virgil kernel: [589911.034274]  [<ffffffffa0348d8e>] iwl_grab_nic_access+0x7e/0x90 [iwlwifi]
- Aug 13 13:25:39 virgil kernel: [589911.034284]  [<ffffffffa034913b>] iwl_write_prph+0x3b/0x120 [iwlwifi]
- Aug 13 13:25:39 virgil kernel: [589911.034297]  [<ffffffffa03596bf>] iwl_apm_init+0x13f/0x1e0 [iwlwifi]
- Aug 13 13:25:39 virgil kernel: [589911.034310]  [<ffffffffa035b290>] iwl_trans_pcie_start_hw+0x130/0x260 [iwlwifi]
- Aug 13 13:25:39 virgil kernel: [589911.034319]  [<ffffffffa033c385>] iwl_op_mode_dvm_start+0x1c5/0x830 [iwlwifi]
- Aug 13 13:25:39 virgil kernel: [589911.034331]  [<ffffffffa0358124>] iwl_ucode_callback+0xae4/0xe90 [iwlwifi]
- Aug 13 13:25:39 virgil kernel: [589911.034340]  [<ffffffff8142bf60>] request_firmware_work_func+0x70/0xd0
- Aug 13 13:25:39 virgil kernel: [589911.034345]  [<ffffffff8107073a>] process_one_work+0x12a/0x420
- Aug 13 13:25:39 virgil kernel: [589911.034349]  [<ffffffff8142bef0>] ? _request_firmware_prepare.isra.6+0x1f0/0x1f0
- Aug 13 13:25:39 virgil kernel: [589911.034352]  [<ffffffff810712de>] worker_thread+0x12e/0x2f0
- Aug 13 13:25:39 virgil kernel: [589911.034356]  [<ffffffff810711b0>] ? manage_workers.isra.25+0x200/0x200
- Aug 13 13:25:39 virgil kernel: [589911.034360]  [<ffffffff810761d3>] kthread+0x93/0xa0
- Aug 13 13:25:39 virgil kernel: [589911.034364]  [<ffffffff816899a4>] kernel_thread_helper+0x4/0x10
- Aug 13 13:25:39 virgil kernel: [589911.034368]  [<ffffffff81076140>] ? flush_kthread_worker+0x80/0x80
- Aug 13 13:25:39 virgil kernel: [589911.034371]  [<ffffffff816899a0>] ? gs_change+0x13/0x13
- Aug 13 13:25:39 virgil kernel: [589911.034374] ---[ end trace 122a7e44f5b9b8ec ]---
- Aug 13 13:25:39 virgil kernel: [589911.052819] iwlwifi 0000:02:00.0: Unknown hardware type
- Aug 13 13:25:39 virgil kernel: [589911.052826] iwlwifi 0000:02:00.0: Unable to init EEPROM
+ Kernel log snippet follows below.  The modprobe -r/modprobe happens at 13:25:39.  Rebooting clears the error:
+ https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1036427/+attachment/3768745/+files/kernel-log
  
  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: linux-image-3.5.0-9-generic 3.5.0-9.9
  ProcVersionSignature: Ubuntu 3.5.0-9.9-generic 3.5.0
  Uname: Linux 3.5.0-9-generic x86_64
  ApportVersion: 2.4-0ubuntu6
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC1:  vorlon     3454 F.... pulseaudio
-  /dev/snd/controlC0:  vorlon     3454 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC1:  vorlon     3454 F.... pulseaudio
+  /dev/snd/controlC0:  vorlon     3454 F.... pulseaudio
  Date: Mon Aug 13 15:38:19 2012
  HibernationDevice: RESUME=UUID=f6ab3c43-61b4-4af7-bf03-fa3b147a1de0
  InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
  MachineType: LENOVO 3249CTO
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.5.0-9-generic root=/dev/mapper/hostname-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
-  linux-restricted-modules-3.5.0-9-generic N/A
-  linux-backports-modules-3.5.0-9-generic  N/A
-  linux-firmware                           1.88
+  linux-restricted-modules-3.5.0-9-generic N/A
+  linux-backports-modules-3.5.0-9-generic  N/A
+  linux-firmware                           1.88
  SourcePackage: linux
  UpgradeStatus: Upgraded to quantal on 2012-06-11 (63 days ago)
  WifiSyslog:
-  
+ 
  dmi.bios.date: 08/23/2010
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6QET52WW (1.22 )
  dmi.board.name: 3249CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr6QET52WW(1.22):bd08/23/2010:svnLENOVO:pn3249CTO:pvrThinkPadX201:rvnLENOVO:rn3249CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 3249CTO
  dmi.product.version: ThinkPad X201
  dmi.sys.vendor: LENOVO

** Summary changed:

- unreliability with Centrino Ultimate-N 6300 wireless connection, 802.11n
+ 8086:422b [Lenovo ThinkPad ThinkPad X201] unreliability with Centrino Ultimate-N 6300 wireless connection, 802.11n

** Tags added: bios-outdated-1.40 needs-upstream-testing regression-
potential

-- 
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https://bugs.launchpad.net/bugs/1036427

Title:
  8086:422b [Lenovo ThinkPad ThinkPad X201] unreliability with Centrino
  Ultimate-N 6300 wireless connection, 802.11n

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  My laptop has been experiencing occasional drops from the 802.11n
  wireless with the current kernel.  When this happens, the card cannot
  see any ESSIDs and spews the error "Request scan called when driver
  not ready."  If I try to unload and reload the module, I get an
  "unable to init EEPROM" error.

  Kernel log snippet follows below.  The modprobe -r/modprobe happens at 13:25:39.  Rebooting clears the error:
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1036427/+attachment/3768745/+files/kernel-log

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: linux-image-3.5.0-9-generic 3.5.0-9.9
  ProcVersionSignature: Ubuntu 3.5.0-9.9-generic 3.5.0
  Uname: Linux 3.5.0-9-generic x86_64
  ApportVersion: 2.4-0ubuntu6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  vorlon     3454 F.... pulseaudio
   /dev/snd/controlC0:  vorlon     3454 F.... pulseaudio
  Date: Mon Aug 13 15:38:19 2012
  HibernationDevice: RESUME=UUID=f6ab3c43-61b4-4af7-bf03-fa3b147a1de0
  InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
  MachineType: LENOVO 3249CTO
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.5.0-9-generic root=/dev/mapper/hostname-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.5.0-9-generic N/A
   linux-backports-modules-3.5.0-9-generic  N/A
   linux-firmware                           1.88
  SourcePackage: linux
  UpgradeStatus: Upgraded to quantal on 2012-06-11 (63 days ago)
  WifiSyslog:

  dmi.bios.date: 08/23/2010
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6QET52WW (1.22 )
  dmi.board.name: 3249CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr6QET52WW(1.22):bd08/23/2010:svnLENOVO:pn3249CTO:pvrThinkPadX201:rvnLENOVO:rn3249CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 3249CTO
  dmi.product.version: ThinkPad X201
  dmi.sys.vendor: LENOVO

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