Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.16 kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:

Once testing of the upstream kernel is complete, please mark this bug as

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.16

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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  WiFi connection suddenly drops

Status in linux package in Ubuntu:

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 
  Apr 08 22:39:30 konstantin kernel: ieee80211 phy0: Hardware restart was 
  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

  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
   /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
   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 
   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.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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