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[John <1575071@xxxxxxxxxxxxxxxxxx>]

This appears to have been fixed in 4.4.0-22 (no sign of the original
symptoms after rebooting)

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https://bugs.launchpad.net/bugs/1575071

Title:
  Graphics corruption (framebuffer offset) in i915 on 4.4.0

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Appeared after upgrading to 16.04 LTS. Mostly happens with switching
  channels in a full-screen irssi window by using Alt and the number
  keys (or the top row of the keyboard).

  Entire screen flickers between normal view, and a semi-arbitary offset
  view (with the entire screen offset by about 50-100 pixel, wrapping to
  the other side). Minor irritation to begin with.

  Eventually lead to the entire screen blanking save for a solid
  yellow/green line (about 5-10 px wide) on the left, occasionally (~1s)
  flicking back to the correct contents.

  Rebooting into 4.2.0 (left over from before the upgrade) appears to
  have fixed the issue.

  
  Hardware: Toshiba Portege z20t
  - "VGA compatible controller [0300]: Intel Corporation Broadwell-U Integrated Graphics [8086:161e] (rev 09) (prog-if 00 [VGA controller])"

  Relevant packages (assuming that they weren't captured):
  - linux-image-4.4.0-21-generic
  - linux-image-extra-4.4.0-21-generic
  - (working version is 4.2.0-35)

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-extra-4.4.0-21-generic 4.4.0-21.37
  ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
  Uname: Linux 4.2.0-35-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  tpg        2401 F.... pulseaudio
   /dev/snd/controlC0:  tpg        2401 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Apr 26 17:08:04 2016
  HibernationDevice: RESUME=UUID=ab95a533-52f3-4458-96dc-9119684b0ed6
  InstallationDate: Installed on 2015-06-19 (312 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  MachineType: TOSHIBA PORTEGE Z20t-B
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-35-generic root=UUID=b6cc139d-95e4-48f1-a3a8-284dbdb3b6fa ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-35-generic N/A
   linux-backports-modules-4.2.0-35-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-04-25 (1 days ago)
  dmi.bios.date: 01/06/2015
  dmi.bios.vendor: TOSHIBA
  dmi.bios.version: Version 1.60
  dmi.board.asset.tag: 0000000000
  dmi.board.name: PORTEGE Z20t-B
  dmi.board.vendor: TOSHIBA
  dmi.board.version: Version A0
  dmi.chassis.asset.tag: 0000000000
  dmi.chassis.type: 10
  dmi.chassis.vendor: TOSHIBA
  dmi.chassis.version: Version 1.0
  dmi.modalias: dmi:bvnTOSHIBA:bvrVersion1.60:bd01/06/2015:svnTOSHIBA:pnPORTEGEZ20t-B:pvrPT15BA-00500Y:rvnTOSHIBA:rnPORTEGEZ20t-B:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0:
  dmi.product.name: PORTEGE Z20t-B
  dmi.product.version: PT15BA-00500Y
  dmi.sys.vendor: TOSHIBA

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