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[Dominikus Rothkopf <dominikus@xxxxxxxxxxxxx>]

Similar behavior on a Dell inspiron 9400:

systemd[1]: Started Network Manager.
systemd[1]: Starting Network Manager Wait Online...
NetworkManager[8547]: <error> [1432706094.998351] [platform/nm-linux-platform.c:2250] link_change(): Netlink error changing link 3:  <UP> mtu 0 (1) driver 'iwl3945' udi '/sys/devices/pci0000:00/0000:00:1c.1/0000:0c:00.0/net/wlan0': Unspecific failure
NetworkManager[8547]: <info> (wlan0): preparing device
kernel: [ 2587.386187] iwl3945 0000:0c:00.0: Unable to initialize device after 5 attempts.
kernel: [ 2587.436284] iwl3945 0000:0c:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5a5a5a2, s/b 0xf802020
kernel: [ 2587.436292] iwl3945 0000:0c:00.0: Unable to set up bootstrap uCode: -5
kernel: [ 2587.482952] iwl3945 0000:0c:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5a5a5a2, s/b 0xf802020
kernel: [ 2587.482957] iwl3945 0000:0c:00.0: Unable to set up bootstrap uCode: -5
kernel: [ 2587.529622] iwl3945 0000:0c:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5a5a5a2, s/b 0xf802020
kernel: [ 2587.529626] iwl3945 0000:0c:00.0: Unable to set up bootstrap uCode: -5
kernel: [ 2587.576289] iwl3945 0000:0c:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5a5a5a2, s/b 0xf802020
kernel: [ 2587.576294] iwl3945 0000:0c:00.0: Unable to set up bootstrap uCode: -5
kernel: [ 2587.622952] iwl3945 0000:0c:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5a5a5a2, s/b 0xf802020
kernel: [ 2587.622956] iwl3945 0000:0c:00.0: Unable to set up bootstrap uCode: -5
rtkit-daemon[7818]: Successfully made thread 8558 of process 8558 (n/a) owned by '1000' high priority at nice level -11.
rtkit-daemon[7818]: Supervising 1 threads of 1 processes of 1 users.
pulseaudio[8558]: [pulseaudio] pid.c: Stale PID file, overwriting.
kernel: [ 2587.660738] iwl3945 0000:0c:00.0: Unable to initialize device after 5 attempts.
wpa_supplicant[840]: Could not set interface wlan0 flags (UP): Input/output error
wpa_supplicant[840]: nl80211: Could not set interface 'wlan0' UP
NetworkManager[8547]: <info> urfkill disappeared from the bus

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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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