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[Jeroko <jeroko@xxxxxxxxx>]

Same problem,  from syslog:

Jun 12 23:07:45 jero-laptop kernel: [68448.600100] iwl3945 0000:04:00.0: Queue 0 stuck for 2500 ms.
Jun 12 23:07:45 jero-laptop kernel: [68448.600111] iwl3945 0000:04:00.0: On demand firmware reload
Jun 12 23:07:45 jero-laptop kernel: [68448.605882] ieee80211 phy0: Hardware restart was requested
Jun 12 23:07:45 jero-laptop kernel: [68448.653834] iwl3945 0000:04:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5
a5a5a2, s/b 0xf802020
Jun 12 23:07:45 jero-laptop kernel: [68448.653840] iwl3945 0000:04:00.0: Unable to set up bootstrap uCode: -5
Jun 12 23:07:45 jero-laptop kernel: [68448.700559] iwl3945 0000:04:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5
a5a5a2, s/b 0xf802020
Jun 12 23:07:45 jero-laptop kernel: [68448.700564] iwl3945 0000:04:00.0: Unable to set up bootstrap uCode: -5
Jun 12 23:07:45 jero-laptop kernel: [68448.747278] iwl3945 0000:04:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5
a5a5a2, s/b 0xf802020
Jun 12 23:07:45 jero-laptop kernel: [68448.747284] iwl3945 0000:04:00.0: Unable to set up bootstrap uCode: -5
Jun 12 23:07:45 jero-laptop kernel: [68448.794010] iwl3945 0000:04:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5
a5a5a2, s/b 0xf802020
Jun 12 23:07:45 jero-laptop kernel: [68448.794014] iwl3945 0000:04:00.0: Unable to set up bootstrap uCode: -5
Jun 12 23:07:45 jero-laptop kernel: [68448.840731] iwl3945 0000:04:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5
a5a5a2, s/b 0xf802020
Jun 12 23:07:45 jero-laptop kernel: [68448.840737] iwl3945 0000:04:00.0: Unable to set up bootstrap uCode: -5
Jun 12 23:07:45 jero-laptop kernel: [68448.878678] iwl3945 0000:04:00.0: Unable to initialize device after 5 attempts.
Jun 12 23:07:45 jero-laptop kernel: [68448.878686] ------------[ cut here ]------------
Jun 12 23:07:45 jero-laptop kernel: [68448.878734] WARNING: CPU: 0 PID: 16738 at /build/buildd/linux-3.19.0/net/mac80211/util.c:1774 ieee8021
1_reconfig+0x47d/0x1480 [mac80211]()
Jun 12 23:07:45 jero-laptop kernel: [68448.878737] Hardware became unavailable during restart.
Jun 12 23:07:45 jero-laptop kernel: [68448.878740] Modules linked in: rfcomm bnep nls_iso8859_1 uas usb_storage nfnetlink_queue nfnetlink_log
 nfnetlink pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) ctr ccm binfmt_misc nls_utf8 nvidia(POE) uvcvideo videobuf2_vmalloc
 videobuf2_memops btusb videobuf2_core v4l2_common videodev bluetooth media coretemp arc4 kvm snd_hda_codec_hdmi iwl3945 iwlegacy snd_hda_codec_realtek mac80211 snd_hda_codec_generic pcmcia snd_hda_intel snd_hda_controller joydev snd_hda_codec serio_raw lpc_ich snd_hwdep cfg80211 yenta_socket drm tifm_7xx1 pcmcia_rsrc snd_pcm tifm_core pcmcia_core snd_seq_midi snd_seq_midi_event toshiba_acpi snd_rawmidi sparse_keymap snd_seq wmi snd_seq_device snd_timer snd irda soundcore crc_ccitt 8250_fintek toshiba_bluetooth shpchp mac_hid cuse nfsd parport_pc ppdev auth_rpcgss nfs_acl lp lockd grace sunrpc parport autofs4 psmouse pata_acpi sdhci_pci firewire_ohci sdhci firewire_core r8169 crc_itu_t mii video
Jun 12 23:07:45 jero-laptop kernel: [68448.878836] CPU: 0 PID: 16738 Comm: kworker/0:1 Tainted: P        W  OE  3.19.0-18-generic #18-Ubuntu
Jun 12 23:07:45 jero-laptop kernel: [68448.878839] Hardware name: TOSHIBA Satellite A200/ISKAE, BIOS V1.80 08/21/2007
Jun 12 23:07:45 jero-laptop kernel: [68448.878858] Workqueue: events ieee80211_restart_work [mac80211]
Jun 12 23:07:45 jero-laptop kernel: [68448.878862]  00000000 00000000 c4cdfe44 c16e9c0d c4cdfe88 c4cdfe78 c10616db f9503b1c
Jun 12 23:07:45 jero-laptop kernel: [68448.878870]  c4cdfea4 00004162 f95038e0 000006ee f94c5b5d 000006ee f94c5b5d f042902c
Jun 12 23:07:45 jero-laptop kernel: [68448.878878]  fffffffb f04283e0 c4cdfe90 c1061743 00000009 c4cdfe88 f9503b1c c4cdfea4
Jun 12 23:07:45 jero-laptop kernel: [68448.878887] Call Trace:
Jun 12 23:07:45 jero-laptop kernel: [68448.878897]  [<c16e9c0d>] dump_stack+0x41/0x52
Jun 12 23:07:45 jero-laptop kernel: [68448.878904]  [<c10616db>] warn_slowpath_common+0x8b/0xc0
Jun 12 23:07:45 jero-laptop kernel: [68448.878930]  [<f94c5b5d>] ? ieee80211_reconfig+0x47d/0x1480 [mac80211]
Jun 12 23:07:45 jero-laptop kernel: [68448.878955]  [<f94c5b5d>] ? ieee80211_reconfig+0x47d/0x1480 [mac80211]
Jun 12 23:07:45 jero-laptop kernel: [68448.878961]  [<c1061743>] warn_slowpath_fmt+0x33/0x40
Jun 12 23:07:45 jero-laptop kernel: [68448.878986]  [<f94c5b5d>] ieee80211_reconfig+0x47d/0x1480 [mac80211]
Jun 12 23:07:45 jero-laptop kernel: [68448.878993]  [<c16ed290>] ? mutex_lock+0x10/0x30
Jun 12 23:07:45 jero-laptop kernel: [68448.879013]  [<f94a2287>] ? ieee80211_scan_cancel+0x97/0x190 [mac80211]
Jun 12 23:07:45 jero-laptop kernel: [68448.879031]  [<f949819d>] ieee80211_restart_work+0x3d/0x80 [mac80211]
Jun 12 23:07:45 jero-laptop kernel: [68448.879037]  [<c10761b0>] ? pwq_dec_nr_in_flight+0x40/0x90
Jun 12 23:07:45 jero-laptop kernel: [68448.879041]  [<c1077ad2>] process_one_work+0x122/0x3a0
Jun 12 23:07:45 jero-laptop kernel: [68448.879046]  [<c1078479>] worker_thread+0x39/0x4d0
Jun 12 23:07:45 jero-laptop kernel: [68448.879051]  [<c109a10f>] ? __wake_up_locked+0x1f/0x30
Jun 12 23:07:45 jero-laptop kernel: [68448.879056]  [<c1078440>] ? rescuer_thread+0x320/0x320
Jun 12 23:07:45 jero-laptop kernel: [68448.879061]  [<c107c61b>] kthread+0x9b/0xb0
Jun 12 23:07:45 jero-laptop kernel: [68448.879067]  [<c16efa81>] ret_from_kernel_thread+0x21/0x30
Jun 12 23:07:45 jero-laptop kernel: [68448.879072]  [<c107c580>] ? kthread_create_on_node+0x150/0x150
Jun 12 23:07:45 jero-laptop kernel: [68448.879075] ---[ end trace 49aeaa507623cb50 ]---
Jun 12 23:07:45 jero-laptop kernel: [68448.879094] wlan0: deauthenticating from c4:27:95:88:90:00 by local choice (Reason: 3=DEAUTH_LEAVING)

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/1408963

Title:
  [Xbuntu 14.04, 14.10 and 15.04] Network manager stops working: iwl3945
  0000:03:00.0: BSM uCode verification failed at addr ...; wlan0:
  deauthenticating from... by local choice (Reason: 3=DEAUTH_LEAVING),

Status in linux-firmware package in Ubuntu:
  Confirmed
Status in network-manager package in Ubuntu:
  Confirmed

Bug description:
  From time to time, the system loses all wireles networks and kubuntu
  network manager applet goes blank - not even one network is shown. All
  wifi connections are broken. Rebooting fixes the issue, switching to
  WICD on-the-fly enables to continue browsing without rebooting, so it
  seems to be no hardware issue or iwl3945 issue.

  What to expect: stable connections and flawless network managing.
  What happens: so above.

  Further informations about the system, the network configuration, the
  package version can be found in the attachment, also parts of rsyslog
  and dmesg.

  Interesting, according to some helpers, are the following lines:
  dmesg:   wlan0: deauthenticating from 02:26:4d:ac:8f:45 by local choice (Reason: 3=DEAUTH_LEAVING)

  lsb_release -a
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description:    Ubuntu 14.10
  Release:        14.10
  Codename:       utopic

  apt-cache policy network-manager
  network-manager:
    Installiert:           0.9.8.8-0ubuntu28
    Installationskandidat: 0.9.8.8-0ubuntu28
    Versionstabelle:
   *** 0.9.8.8-0ubuntu28 0
          500 http://de.archive.ubuntu.com/ubuntu/ utopic/main amd64 Packages
          100 /var/lib/dpkg/status

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