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[Sergio Callegari <sergio.callegari@xxxxxxxxx>]

I also have an issue with a 5ghz network, where the system keeps
disconnecting and in dmesg I see continuous updates to the crda domain.

Weird enough, loading iwlwifi with the 5ghz_disable does not disable the
5ghz band at all. I still see the APs on the 5ghz band in iwlist wlan0
scan.

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https://bugs.launchpad.net/bugs/1129661

Title:
  [8086:4238]: frequents drop outs and occasional disconnects on 5GHz
  wifi

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  When I connect to my 5GHz wlan from a certain distance, I get
  frequents drop outs and occasional disconnects accompagnied with this:

  Feb 18 01:02:19 simon-laptop kernel: [20827.434858] ------------[ cut here ]------------
  Feb 18 01:02:19 simon-laptop kernel: [20827.434886] WARNING: at /build/buildd/linux-lts-quantal-3.5.0/drivers/net/wireless/iwlwifi/iwl-trans.h:565 iwlagn_mac_flush+0x1a3/0x1b0 [iwlwifi]()
  Feb 18 01:02:19 simon-laptop kernel: [20827.434891] Hardware name: 2516CTO
  Feb 18 01:02:19 simon-laptop kernel: [20827.434895] iwl_trans_wait_tx_queue_empty bad state = 0
  Feb 18 01:02:19 simon-laptop kernel: [20827.434898] Modules linked in: iwlwifi mac80211 cfg80211 ebtable_nat ebtables bridge stp llc snd_hda_codec_hdmi nf_conntrack_ipv6 nf_defrag_ipv6 coretemp snd_hda_codec_conexant ip6table_filter snd_hda_intel kvm_intel snd_hda_codec ip6_tables kvm xt_LOG xt_owner xt_conntrack joydev iptable_filter arc4 ipt_MASQUERADE snd_hwdep snd_pcm xt_tcpudp thinkpad_acpi snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq uvcvideo iptable_nat snd_timer nf_nat videobuf2_core videodev snd_seq_device firewire_ohci ghash_clmulni_intel nf_conntrack_ipv4 e1000e nf_conntrack psmouse dm_multipath firewire_core sdhci_pci nf_defrag_ipv4 intel_ips videobuf2_vmalloc crc_itu_t snd sdhci snd_page_alloc ip_tables scsi_dh videobuf2_memops soundcore lpc_ich nvram x_tables microcode serio_raw mac_hid dm_crypt mxm_wmi aesni_intel cryptd aes_x86_64 wmi i915 drm_kms_helper drm i2c_algo_bit video [last unloaded: cfg80211]
  Feb 18 01:02:19 simon-laptop kernel: [20827.435029] Pid: 1981, comm: kworker/u:2 Not tainted 3.5.0-24-generic #37~precise1-Ubuntu
  Feb 18 01:02:19 simon-laptop kernel: [20827.435032] Call Trace:
  Feb 18 01:02:19 simon-laptop kernel: [20827.435046]  [<ffffffff81052c6f>] warn_slowpath_common+0x7f/0xc0
  Feb 18 01:02:19 simon-laptop kernel: [20827.435089]  [<ffffffffa059a420>] ? ieee80211_mgd_probe_ap.part.26+0x130/0x130 [mac80211]
  Feb 18 01:02:19 simon-laptop kernel: [20827.435097]  [<ffffffff81052d66>] warn_slowpath_fmt+0x46/0x50
  Feb 18 01:02:19 simon-laptop kernel: [20827.435117]  [<ffffffffa039efe3>] iwlagn_mac_flush+0x1a3/0x1b0 [iwlwifi]
  Feb 18 01:02:19 simon-laptop kernel: [20827.435150]  [<ffffffffa0599cf1>] ieee80211_mgd_probe_ap_send+0x131/0x210 [mac80211]
  Feb 18 01:02:19 simon-laptop kernel: [20827.435160]  [<ffffffff810707d2>] ? cwq_activate_first_delayed+0x52/0x110
  Feb 18 01:02:19 simon-laptop kernel: [20827.435181]  [<ffffffffa0270264>] ? ___cfg80211_scan_done+0x84/0xe0 [cfg80211]
  Feb 18 01:02:19 simon-laptop kernel: [20827.435215]  [<ffffffffa059a3ff>] ieee80211_mgd_probe_ap.part.26+0x10f/0x130 [mac80211]
  Feb 18 01:02:19 simon-laptop kernel: [20827.435249]  [<ffffffffa059a44e>] ieee80211_sta_monitor_work+0x2e/0x30 [mac80211]
  Feb 18 01:02:19 simon-laptop kernel: [20827.435257]  [<ffffffff81071b5a>] process_one_work+0x11a/0x480
  Feb 18 01:02:19 simon-laptop kernel: [20827.435265]  [<ffffffff81072b75>] worker_thread+0x165/0x370
  Feb 18 01:02:19 simon-laptop kernel: [20827.435273]  [<ffffffff81072a10>] ? manage_workers.isra.29+0x130/0x130
  Feb 18 01:02:19 simon-laptop kernel: [20827.435280]  [<ffffffff81077b13>] kthread+0x93/0xa0
  Feb 18 01:02:19 simon-laptop kernel: [20827.435289]  [<ffffffff816a8d24>] kernel_thread_helper+0x4/0x10
  Feb 18 01:02:19 simon-laptop kernel: [20827.435297]  [<ffffffff81077a80>] ? flush_kthread_worker+0xb0/0xb0
  Feb 18 01:02:19 simon-laptop kernel: [20827.435304]  [<ffffffff816a8d20>] ? gs_change+0x13/0x13
  Feb 18 01:02:19 simon-laptop kernel: [20827.435308] ---[ end trace 292e790c334eb4d5 ]---
  Feb 18 01:02:19 simon-laptop kernel: [20827.435320] ieee80211 phy0: Hardware restart was requested
  Feb 18 01:02:19 simon-laptop kernel: [20827.435364] ------------[ cut here ]------------

  The same AP also has a 2.4GHz wlan and I don't have any problem with
  it.

  Various informations:

  $ lsb_release -rd
  Description:	Ubuntu 12.04.2 LTS
  Release:	12.04

  $ cat /proc/version_signature
  Ubuntu 3.5.0-24.37~precise1-generic 3.5.7.4

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.5.0-24-generic 3.5.0-24.37~precise1
  ProcVersionSignature: Ubuntu 3.5.0-24.37~precise1-generic 3.5.7.4
  Uname: Linux 3.5.0-24-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.25.
  ApportVersion: 2.0.1-0ubuntu17.1
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  simon      4210 F.... pulseaudio
   /dev/snd/pcmC0D0p:   simon      4210 F...m pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf2620000 irq 44'
     Mixer name	: 'Intel IbexPeak HDMI'
     Components	: 'HDA:14f15069,17aa214c,00100302 HDA:80862804,17aa21b5,00100000'
     Controls      : 43
     Simple ctrls  : 15
  Card29.Amixer.info:
   Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 6IHT43WW-1.18'
     Mixer name	: 'ThinkPad EC 6IHT43WW-1.18'
     Components	: ''
     Controls      : 1
     Simple ctrls  : 1
  Card29.Amixer.values:
   Simple mixer control 'Console',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Date: Mon Feb 18 20:09:13 2013
  HibernationDevice: RESUME=/dev/dm-8
  Lsusb:
   Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
   Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 003: ID 17ef:480f Lenovo Integrated Webcam [R5U877]
  MachineType: LENOVO 2516CTO
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=en_CA:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_CA.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.5.0-24-generic root=/dev/mapper/crypt-root ro quiet splash i915.i915_enable_fbc=1 i915.lvds_downclock=1 drm.vblankoffdelay=1 possible_cpus=4 vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.5.0-24-generic N/A
   linux-backports-modules-3.5.0-24-generic  N/A
   linux-firmware                            1.79.2
  RfKill:
   1: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/26/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6IET84WW (1.44 )
  dmi.board.name: 2516CTO
  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:bvr6IET84WW(1.44):bd09/26/2012:svnLENOVO:pn2516CTO:pvrThinkPadT410:rvnLENOVO:rn2516CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2516CTO
  dmi.product.version: ThinkPad T410
  dmi.sys.vendor: LENOVO

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