Public bug reported:

This started to happen only with newer kernel versions.  The WiFi was
previously absolutely solid.  When the WiFi connection drops, there are
clear kernel error messages:

Apr 08 22:39:29 konstantin kernel: iwl3945 0000:02:00.0: Queue 4 stuck for 2048 
ms.
Apr 08 22:39:30 konstantin kernel: iwl3945 0000:02:00.0: On demand firmware 
reload
Apr 08 22:39:30 konstantin kernel: ieee80211 phy0: Hardware restart was 
requested
Apr 08 22:39:30 konstantin kernel: iwl3945 0000:02:00.0: BSM uCode verification 
failed at addr 0x00003800+0 
Apr 08 22:39:30 konstantin kernel: iwl3945 0000:02:00.0: Unable to set up 
bootstrap uCode: -5

The last two messsages are repeated a few times.  This is followed by
more detailed stack traces, but the hardware does not recover.
Unloading the iwl3945 module and reloading it did not help in a few
tests.

Looking at the log some more, I see this line

Apr 08 22:33:38 konstantin kernel: iwl3945 0000:02:00.0: Enabling power
save might cause firmware crashes

I will try to find out if this can be disabled and do more test then.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: linux-image-4.13.0-37-generic 4.13.0-37.42
ProcVersionSignature: Ubuntu 4.13.0-37.42-generic 4.13.13
Uname: Linux 4.13.0-37-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  regina     1098 F.... pulseaudio
CurrentDesktop: GNOME
Date: Sun Apr  8 22:56:35 2018
HibernationDevice: RESUME=UUID=4c990619-fde4-4d44-b45a-f240be602537
InstallationDate: Installed on 2017-04-19 (354 days ago)
InstallationMedia: Ubuntu-GNOME 17.04 "Zesty Zapus" - Release amd64 (20170412)
MachineType: Hewlett-Packard HP Pavilion dv6500 Notebook PC
ProcEnviron:
 LANG=de_DE.UTF-8
 TERM=xterm-256color
 SHELL=/bin/bash
 XDG_RUNTIME_DIR=<set>
 PATH=(custom, no user)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-37-generic 
root=/dev/mapper/ubuntu--gnome--vg-root ro quiet splash video=SVIDEO-1:d 
vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.13.0-37-generic N/A
 linux-backports-modules-4.13.0-37-generic  N/A
 linux-firmware                             1.169.3
SourcePackage: linux
UpgradeStatus: Upgraded to artful on 2018-01-19 (78 days ago)
dmi.bios.date: 04/04/2007
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.05
dmi.board.name: 30CC
dmi.board.vendor: Quanta
dmi.board.version: 79.10
dmi.chassis.type: 10
dmi.chassis.vendor: Quanta
dmi.chassis.version: N/A
dmi.modalias: 
dmi:bvnHewlett-Packard:bvrF.05:bd04/04/2007:svnHewlett-Packard:pnHPPaviliondv6500NotebookPC:pvrRev1:rvnQuanta:rn30CC:rvr79.10:cvnQuanta:ct10:cvrN/A:
dmi.product.family: 103C_5335KV
dmi.product.name: HP Pavilion dv6500 Notebook PC
dmi.product.version: Rev 1
dmi.sys.vendor: Hewlett-Packard

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug artful wayland-session

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https://bugs.launchpad.net/bugs/1762248

Title:
  WiFi connection suddenly drops

Status in linux package in Ubuntu:
  New

Bug description:
  This started to happen only with newer kernel versions.  The WiFi was
  previously absolutely solid.  When the WiFi connection drops, there
  are clear kernel error messages:

  Apr 08 22:39:29 konstantin kernel: iwl3945 0000:02:00.0: Queue 4 stuck for 
2048 ms.
  Apr 08 22:39:30 konstantin kernel: iwl3945 0000:02:00.0: On demand firmware 
reload
  Apr 08 22:39:30 konstantin kernel: ieee80211 phy0: Hardware restart was 
requested
  Apr 08 22:39:30 konstantin kernel: iwl3945 0000:02:00.0: BSM uCode 
verification failed at addr 0x00003800+0 
  Apr 08 22:39:30 konstantin kernel: iwl3945 0000:02:00.0: Unable to set up 
bootstrap uCode: -5

  The last two messsages are repeated a few times.  This is followed by
  more detailed stack traces, but the hardware does not recover.
  Unloading the iwl3945 module and reloading it did not help in a few
  tests.

  Looking at the log some more, I see this line

  Apr 08 22:33:38 konstantin kernel: iwl3945 0000:02:00.0: Enabling
  power save might cause firmware crashes

  I will try to find out if this can be disabled and do more test then.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-37-generic 4.13.0-37.42
  ProcVersionSignature: Ubuntu 4.13.0-37.42-generic 4.13.13
  Uname: Linux 4.13.0-37-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  regina     1098 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Sun Apr  8 22:56:35 2018
  HibernationDevice: RESUME=UUID=4c990619-fde4-4d44-b45a-f240be602537
  InstallationDate: Installed on 2017-04-19 (354 days ago)
  InstallationMedia: Ubuntu-GNOME 17.04 "Zesty Zapus" - Release amd64 (20170412)
  MachineType: Hewlett-Packard HP Pavilion dv6500 Notebook PC
  ProcEnviron:
   LANG=de_DE.UTF-8
   TERM=xterm-256color
   SHELL=/bin/bash
   XDG_RUNTIME_DIR=<set>
   PATH=(custom, no user)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-37-generic 
root=/dev/mapper/ubuntu--gnome--vg-root ro quiet splash video=SVIDEO-1:d 
vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.13.0-37-generic N/A
   linux-backports-modules-4.13.0-37-generic  N/A
   linux-firmware                             1.169.3
  SourcePackage: linux
  UpgradeStatus: Upgraded to artful on 2018-01-19 (78 days ago)
  dmi.bios.date: 04/04/2007
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: F.05
  dmi.board.name: 30CC
  dmi.board.vendor: Quanta
  dmi.board.version: 79.10
  dmi.chassis.type: 10
  dmi.chassis.vendor: Quanta
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnHewlett-Packard:bvrF.05:bd04/04/2007:svnHewlett-Packard:pnHPPaviliondv6500NotebookPC:pvrRev1:rvnQuanta:rn30CC:rvr79.10:cvnQuanta:ct10:cvrN/A:
  dmi.product.family: 103C_5335KV
  dmi.product.name: HP Pavilion dv6500 Notebook PC
  dmi.product.version: Rev 1
  dmi.sys.vendor: Hewlett-Packard

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