[Lenovo ThinkPad T400] Screen corruption

[MegaBrutal]

I often perceive massive screen corruption, most prominently in Firefox / GMail, but it may happen with any application, including terminals. Sometimes oversized letters appear. I run video stress tests, but they run without errors. I suspect the problem presents when many text needs to be rendered on-screen, as odd as it sounds.

I will attach screenshots.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: xorg 1:7.7+7ubuntu2
ProcVersionSignature: Ubuntu 3.16.0-34.45-generic 3.16.7-ckt8
Uname: Linux 3.16.0-34-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.14.7-0ubuntu8.2
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Wed Apr 15 07:23:31 2015
DistUpgraded: 2014-11-11 12:36:03,224 DEBUG enabling apt cron job
DistroCodename: utopic
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:20e4]
   Subsystem: Lenovo Device [17aa:20e4]
InstallationDate: Installed on 2014-06-10 (308 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: LENOVO 6474B84
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-34-generic root=/dev/mapper/thinkvg-rootlv ro rootflags=subvol=@
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to utopic on 2014-11-11 (154 days ago)
dmi.bios.date: 10/17/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: 7UET94WW (3.24 )
dmi.board.name: 6474B84
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr7UET94WW(3.24):bd10/17/2012:svnLENOVO:pn6474B84:pvrThinkPadT400:rvnLENOVO:rn6474B84:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 6474B84
dmi.product.version: ThinkPad T400
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.12+14.10.20140918-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.56-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.3.2-0ubuntu0.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.3.2-0ubuntu0.1
version.xserver-xorg-core: xserver-xorg-core 2:1.16.0-1ubuntu1.3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.914-1~exp1ubuntu4.2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2
xserver.bootTime: Sat Apr 11 00:20:40 2015
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 16435
 vendor LEN
xserver.version: 2:1.16.0-1ubuntu1.3

[penalvch (penalvch)]

MegaBrutal, thank you for reporting this and helping make Ubuntu better. Could you please test for this via http://cdimage.ubuntu.com/daily-live/current/ and advise to the results?

[MegaBrutal (qbu6to)]

I experience the exact same problems with the most recent Vivid Vervet Live CD build.

[penalvch (penalvch)]

MegaBrutal, did this also happen in Trusty, or was this issue new in Utopic?

[MegaBrutal (qbu6to)]

To be honest, I don't remember. It appeared around the time when Utopic was released, but I don't know whether it was before or after the upgrade.

[penalvch (penalvch)]

MegaBrutal, for regression testing purposes, could you please test 14.04.0 (not 14.04.1, live environment is fine) via http://old-releases.ubuntu.com/releases/14.04.0/ and advise to the results?

[MegaBrutal (qbu6to)]

I used the Trusty 14.04.0 Live CD for like half a day and didn't experience the issue.

[penalvch (penalvch)]

MegaBrutal, the issue you are reporting is an upstream one. Could you please report this problem through the appropriate channel by following the instructions verbatim at https://01.org/linuxgraphics/documentation/how-report-bugs ?

Please provide a direct URL to your bug report once you have made it so that it may be tracked.

Thank you for your understanding.

[Daniel van Vugt (vanvugt)]

Thank you for reporting this bug to Ubuntu.
Ubuntu 15.04 (vivid) reached end-of-life on February 4, 2016.
Ubuntu 14.10 (utopic) reached end-of-life on July 23, 2015.

See this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in and change the bug status to Confirmed.