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[Bug 1542939] Re: system freeze after vt switching

 

This bug affects the 4.4 kernel, including the xenial kernel and the
lts-xenial kernel in trusty.

As described in the freedesktop bug report,  the bug was fixed in the
4.5 kernel with the following commit,

http://kernel.ubuntu.com/git/ubuntu/linux.git/commit/?id=92826fcdfc147a7d16766e987c12a9dfe1860c3f

The commit was not backported to the 4.4 kernel, and is not present in
the xenial kernel.  The commit does apply cleanly to the 4.4 kernel and
fixes the bug.

Please consider applying this commit to the xenial kernel and the lts-
xenial kernel in trusty.

I'll attach the commit as a patch for the benefit of the bots.

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https://bugs.launchpad.net/bugs/1542939

Title:
  system freeze after vt switching

Status in Linux:
  Fix Released
Status in linux package in Ubuntu:
  Confirmed
Status in Fedora:
  Unknown

Bug description:
  I'm trying to use the ctrl+alt+1 to switch to a terminal - ok,
  after switching back by  ctrl+alt+7 the system freeze

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-3-generic 4.4.0-3.17
  ProcVersionSignature: Ubuntu 4.4.0-3.17-generic 4.4.1
  Uname: Linux 4.4.0-3-generic x86_64
  ApportVersion: 2.19.4-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  stinger    1644 F.... pulseaudio
  Date: Sun Feb  7 22:27:42 2016
  HibernationDevice: RESUME=UUID=888e93f3-1a7d-4bf8-a00d-cea6a759d03a
  InstallationDate: Installed on 2015-11-12 (87 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20151112)
  Lsusb:
   Bus 002 Device 003: ID 24ae:2000  
   Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: ASUSTeK Computer Inc. P53E
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-3-generic root=UUID=9ad09333-ac7d-4b10-99a0-1e598daa4753 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-3-generic N/A
   linux-backports-modules-4.4.0-3-generic  N/A
   linux-firmware                           1.155
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/15/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P53E.209
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: P53E
  dmi.board.vendor: ASUSTeK Computer Inc.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK Computer Inc.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP53E.209:bd03/15/2012:svnASUSTeKComputerInc.:pnP53E:pvr1.0:rvnASUSTeKComputerInc.:rnP53E:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
  dmi.product.name: P53E
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK Computer Inc.

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References