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[Riki Villalba <1408963@xxxxxxxxxxxxxxxxxx>]

Hello,
After adding the following text in /etc/modprobe.d/iwl3945.conf the issue didn't happened again (> 48 h) to me

#parm: antenna:select antenna (1=Main, 2=Aux, default 0 [both]) (int)
#parm: swcrypto:using software crypto (default 1 [software]) (int)
#parm: disable_hw_scan:disable hardware scanning (default 1) (int)
#parm: fw_restart:restart firmware in case of error (int)
#
options iwl3945 antenna=1
options iwl3945 disable_hw_scan=0
options iwl3945 fw_restart=0

This config file had been attached in the comment #39
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1408963/comments/39

My wireless card: 
$ lspci
0b:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02)
	Subsystem: Intel Corporation Device 1020
	Flags: bus master, fast devsel, latency 0, IRQ 30
	Memory at fe7ff000 (32-bit, non-prefetchable) [size=4K]
	Capabilities: [c8] Power Management version 2
	Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
	Capabilities: [e0] Express Legacy Endpoint, MSI 00
	Capabilities: [100] Advanced Error Reporting
	Capabilities: [140] Device Serial Number 00-1f-3c-ff-ff-19-f6-00
	Kernel driver in use: iwl3945

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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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