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[oleg <1542939@xxxxxxxxxxxxxxxxxx>]

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

The linked freedesktop bug report mentions that 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.

I initially tested the 4.5 mainline kernel and found that it does fix
the bug.

I then attempted to apply the aforementioned commit to the xenial kernel
and found that it does not apply cleanly.  By including two earlier
patches I was able to get it to apply (with minor porting).   But the
resultant kernel did not fix the bug.

Details:  
The two earlier patches are:

drm/i915/ivb: Move WaCxSRDisabledForSpriteScaling w/a to atomic check,
d21fbe87ce18297af0a9b7cc0cd545fd9ac28d33

drm/i915: Move disable_cxsr to the crtc_state, 
ab1d3a0e5a44f5b1a8d1f811e925c8519b56fba4


** Patch removed: "drm/i915: Calculate watermark related members in the crtc_state, v4."
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1542939/+attachment/4639342/+files/patch

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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:
  Incomplete
Status in linux-lts-xenial 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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