Detected a hung GPU, disabling acceleration.

[fsando]

Kubuntu 13.04
Thinkpad T520
Bios: automatic (i.e. detect support for descrete graphics, though does not seem to detect anything)

$uname -a
Linux fk1304 3.8.0-27-generic #40-Ubuntu SMP Tue Jul 9 00:17:05 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

Screen will regularly (typically 1-3 times a day) freeze for a few moments, then the acceleration is disabled.

I have seen this happen in different situations:
When switching between folders in dolphin
When scrolling in FF
When switching between desktops (I use kwin set up with a 9 desktops grid, no Compiz)
When running a java app and a vmware virtual machine

I have not found a certain way to make this happen, though it seems to be related to spikes of heavy activity.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: xorg 1:7.7+1ubuntu4
ProcVersionSignature: Ubuntu 3.8.0-27.40-generic 3.8.13.4
Uname: Linux 3.8.0-27-generic x86_64
ApportVersion: 2.9.2-0ubuntu8.3
Architecture: amd64
Date: Fri Aug 16 12:32:17 2013
InstallationDate: Installed on 2013-04-24 (113 days ago)
InstallationMedia: Kubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130402.1)
MarkForUpload: True
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)

[penalvch (penalvch)]

fsando, could you please confirm this issue exists with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com/daily-live/current/ . If the issue remains, could you please run the following command in the development release from a Terminal (Applications->Accessories->Terminal), as it will automatically gather and attach updated debug information to this report:

apport-collect -p linux <replace-with-bug-number>

Also, could you please test the latest upstream kernel available following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Please do not test the daily folder, but the one all the way at the bottom. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags:
kernel-fixed-upstream
kernel-fixed-upstream-VERSION-NUMBER

where VERSION-NUMBER is the version number of the kernel you tested. For example:
kernel-fixed-upstream-v3.11-rc5

This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag:
needs-upstream-testing

If the mainline kernel does not fix this bug, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-VERSION-NUMBER

As well, please remove the tag:
needs-upstream-testing

Once testing of the upstream kernel is complete, please mark this bug's Status as Confirmed. Please let us know your results. Thank you for your understanding.

[fsando (fsando)]

Correction:
Machine is Lenovo W520 with Nvidia/Intel graphics
(not T520, don't know why I mistyped that)

I am in the closing stages of a large project with a serious deadline. I will not be able to reinstall things until the end of September. I'm really sorry. In this case it would entail switching from Kubuntu to Ubuntu, redo my whole dev-setup and work with it for a several days to make sure the issue was gone.

I can however test the kernels, and when my project is over I will be happy to participate in more extensive testing - also future bugs.

[fsando (fsando)]

I am now running Ubuntu 13.10 live from usb. I don't know if this will be sufficient to test the issue. I can do all my non-essential work from here.

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]