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[Bug 1575071] Re: Graphics corruption (framebuffer offset) in i915 on 4.4.0


John, as per http://www.mytoshiba.com.au/support/computers/portege/z20t
/pt15ba-00500y/download an update to your computer's buggy, insecure,
and outdated BIOS is available (2.10). If you update to this following
https://help.ubuntu.com/community/BIOSUpdate does it change anything?

For more on BIOS updates and linux, please see

Please note your current BIOS is already in the Bug Description, so
posting this on the old BIOS would not be helpful.

Also, you don't have to create a new bug report.

Once the BIOS is updated, if the problem is still reproducible:
1) Please provide the output of the following terminal command (not perform an apport-collect):
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
2) Please make a comment specifically advising on if there was an improvement or not.
3) Please mark this report Status Confirmed.

If it's not reproducible, please mark this as Invalid.

Thank you for your understanding.

** Tags added: bios-outdated-2.10

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  Graphics corruption (framebuffer offset) in i915 on 4.4.0

Status in linux package in Ubuntu:

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
   /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
   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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