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[robochat <rjsteed@xxxxxxxxxx>]

I've also been seeing this bug in kubuntu for about the last 6 months. The wifi actually works when I come directly out of sleep mode but if the computer screen is allowed to lock then afterwards the wifi is broken and journalctl shows errors of the kind
"wlan0: Failed check-sdata-in-driver check, flags: 0x4". I've tried to restart services and modprobe the iwl3945 module but this often crashes the computer. Instead I've found that sending the computer into 'sleep' mode and waking it up will restore the wifi -at least for a while.

$ uname -a
...       3.19.0-26-generic #28-Ubuntu SMP Tue Aug 11 14:16:45 UTC 2015 i686 i686 i686 GNU/Linux

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https://bugs.launchpad.net/bugs/1457587

Title:
  wifi crash on wakeup (iwl3945 cfg80211)

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  [124243.445408] ------------[ cut here ]------------
  [124243.445437] WARNING: CPU: 0 PID: 24983 at /build/buildd/linux-3.19.0/net/mac80211/driver-ops.h:12 ieee80211_do_stop+0x8e7/0x8f0 [mac80211]()
  [124243.445439] wlan0:  Failed check-sdata-in-driver check, flags: 0x4
  [124243.445441] Modules linked in: ctr ccm uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media coretemp kvm_intel kvm amdkfd amd_iommu_v2 arc4 snd_hda_codec_conexant snd_hda_codec_generic joydev snd_hda_codec_hdmi serio_raw radeon snd_hda_intel snd_hda_controller snd_hda_codec iwl3945 snd_hwdep iwlegacy ttm snd_pcm drm_kms_helper lpc_ich mac80211 snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq drm snd_seq_device cfg80211 snd_timer snd toshiba_acpi i2c_algo_bit soundcore shpchp sparse_keymap wmi toshiba_bluetooth mac_hid video parport_pc ppdev lp parport autofs4 psmouse firewire_ohci firewire_core sdhci_pci crc_itu_t sdhci pata_acpi sky2
  [124243.445485] CPU: 0 PID: 24983 Comm: kworker/0:0 Tainted: G        W      3.19.0-17-generic #17-Ubuntu
  [124243.445487] Hardware name: TOSHIBA Satellite P300/Satellite P300, BIOS V4.20    01/05/2009
  [124243.445498] Workqueue: events ieee80211_restart_work [mac80211]
  [124243.445500]  ffffffffc0627768 ffff8800805a3b48 ffffffff817c27cd 0000000000000007
  [124243.445503]  ffff8800805a3b98 ffff8800805a3b88 ffffffff8107593a ffff88013abb93a0
  [124243.445506]  ffff8801395688c0 ffff8800b8ee0680 ffff8800b8ee1530 ffff8800b8ee1548
  [124243.445509] Call Trace:
  [124243.445516]  [<ffffffff817c27cd>] dump_stack+0x45/0x57
  [124243.445520]  [<ffffffff8107593a>] warn_slowpath_common+0x8a/0xc0
  [124243.445523]  [<ffffffff810759b6>] warn_slowpath_fmt+0x46/0x50
  [124243.445537]  [<ffffffffc05c6947>] ieee80211_do_stop+0x8e7/0x8f0 [mac80211]
  [124243.445542]  [<ffffffff816e2fb3>] ? dev_deactivate_many+0x213/0x260
  [124243.445650]  [<ffffffffc05c696a>] ieee80211_stop+0x1a/0x20 [mac80211]
  [124243.445654]  [<ffffffff816b9145>] __dev_close_many+0x95/0xf0
  [124243.445657]  [<ffffffff816b9221>] dev_close_many+0x81/0x120
  [124243.445660]  [<ffffffff816bb7e6>] dev_close.part.68+0x36/0x50
  [124243.445663]  [<ffffffff816bb821>] dev_close+0x21/0x30
  [124243.445681]  [<ffffffffc045da5d>] cfg80211_shutdown_all_interfaces+0x4d/0xc0 [cfg80211]
  [124243.445699]  [<ffffffffc05e11c5>] ieee80211_reconfig+0x325/0x1620 [mac80211]
  [124243.445709]  [<ffffffffc05b01c2>] ieee80211_restart_work+0x42/0x80 [mac80211]
  [124243.445713]  [<ffffffff8108eb58>] process_one_work+0x158/0x430
  [124243.445716]  [<ffffffff8108f69b>] worker_thread+0x5b/0x530
  [124243.445719]  [<ffffffff8108f640>] ? rescuer_thread+0x3a0/0x3a0
  [124243.445723]  [<ffffffff81094739>] kthread+0xc9/0xe0
  [124243.445726]  [<ffffffff81094670>] ? kthread_create_on_node+0x1c0/0x1c0
  [124243.445730]  [<ffffffff817c9858>] ret_from_fork+0x58/0x90
  [124243.445733]  [<ffffffff81094670>] ? kthread_create_on_node+0x1c0/0x1c0
  [124243.445735] ---[ end trace a62a134da66aa279 ]---
  [124243.448086] cfg80211: Calling CRDA to update world regulatory domain
  [124243.556433] cfg80211: World regulatory domain updated:
  [124243.556437] cfg80211:  DFS Master region: unset
  [124243.556439] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
  [124243.556443] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  [124243.556446] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  [124243.556448] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm), (N/A)
  [124243.556451] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  [124243.556453] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  [133493.814221] iwl3945 0000:02:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5a5a5a2, s/b 0xf802020
  [133493.814227] iwl3945 0000:02:00.0: Unable to set up bootstrap uCode: -5
  [133493.860919] iwl3945 0000:02:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5a5a5a2, s/b 0xf802020
  [133493.860921] iwl3945 0000:02:00.0: Unable to set up bootstrap uCode: -5
  [133493.907609] iwl3945 0000:02:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5a5a5a2, s/b 0xf802020
  [133493.907612] iwl3945 0000:02:00.0: Unable to set up bootstrap uCode: -5
  [133493.954304] iwl3945 0000:02:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5a5a5a2, s/b 0xf802020
  [133493.954306] iwl3945 0000:02:00.0: Unable to set up bootstrap uCode: -5
  [133494.001001] iwl3945 0000:02:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5a5a5a2, s/b 0xf802020
  [133494.001003] iwl3945 0000:02:00.0: Unable to set up bootstrap uCode: -5
  [133494.044771] iwl3945 0000:02:00.0: Unable to initialize device after 5 attempts.
  [133545.013431] iwl3945 0000:02:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5a5a5a2, s/b 0xf802020
  [133545.013438] iwl3945 0000:02:00.0: Unable to set up bootstrap uCode: -5
  [133545.060131] iwl3945 0000:02:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5a5a5a2, s/b 0xf802020
  [133545.060135] iwl3945 0000:02:00.0: Unable to set up bootstrap uCode: -5
  [133545.106823] iwl3945 0000:02:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5a5a5a2, s/b 0xf802020
  [133545.106825] iwl3945 0000:02:00.0: Unable to set up bootstrap uCode: -5
  [133545.153516] iwl3945 0000:02:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5a5a5a2, s/b 0xf802020
  [133545.153519] iwl3945 0000:02:00.0: Unable to set up bootstrap uCode: -5
  [133545.200211] iwl3945 0000:02:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5a5a5a2, s/b 0xf802020
  [133545.200213] iwl3945 0000:02:00.0: Unable to set up bootstrap uCode: -5
  [133545.240647] iwl3945 0000:02:00.0: Unable to initialize device after 5 attempts.
  --- 
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  hlorridi   1680 F.... pulseaudio
   /dev/snd/controlC1:  hlorridi   1680 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 15.04
  HibernationDevice: RESUME=UUID=d4074c4f-5617-4a98-87e1-9c894f5b75fa
  InstallationDate: Installed on 2014-06-12 (350 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: TOSHIBA Satellite P300
  Package: linux (not installed)
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-18-generic root=UUID=0f633b72-6188-4117-8517-6773907e19ce ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.19.0-18.18-generic 3.19.6
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-18-generic N/A
   linux-backports-modules-3.19.0-18-generic  N/A
   linux-firmware                             1.143.1
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  Tags:  vivid
  Uname: Linux 3.19.0-18-generic x86_64
  UpgradeStatus: Upgraded to vivid on 2015-05-16 (12 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo vboxusers
  _MarkForUpload: True
  dmi.bios.date: 01/05/2009
  dmi.bios.vendor: TOSHIBA
  dmi.bios.version: V4.20
  dmi.board.name: Satellite P300
  dmi.board.vendor: TOSHIBA
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: TOSHIBA
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnTOSHIBA:bvrV4.20:bd01/05/2009:svnTOSHIBA:pnSatelliteP300:pvrPSPC4E-03R015FR:rvnTOSHIBA:rnSatelliteP300:rvrNotApplicable:cvnTOSHIBA:ct10:cvrN/A:
  dmi.product.name: Satellite P300
  dmi.product.version: PSPC4E-03R015FR
  dmi.sys.vendor: TOSHIBA

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