Temporary screen corruption / glitches on Ubuntu x86-64

[Stefan K.]

Binary package hint: xserver-xorg-core

Hi,
during normal usage of my computer, my screen occasionally partially corrupts, especially the lower fifth or so of the screen, sometimes the lower half. It's mostly just multi-coloured garbage (I sometimes get the impression, it's a lot of orange and black) mixed with the real contents of the screen and lasts for under a second. Sometimes this happens more often, sometimes less often, and I have yet to find out, why.
I'm reporting this for core, as I've seen this on two different notebooks (HP dv9700 and Lenovo Thinkpad T400), with three different graphics cards (Nvidia Geforce 8400M GS on the HP; ATI Mobility Radeon HD3470, Intel GMA4500 MHD on the Lenovo), both using the amd64 version of Ubuntu 10.04.
On both laptops I've also seen this using Ubuntu from the live CD, so it happens in stock Ubuntu, too. I also considered the fact that my CD might be corrupted, but then #a everything else is working normally, #b I guess the live CD compares a checksum against itself (although I don't know any more with the new CD's), #c I uninstalled and then reinstalled Xorg from the web, to no avail.

Sorry, if this bug already exists, but I couldn't find anything matching.

[Bryce Harrington (bryce)]

Hi Aaron,

Please run the command 'apport-collect BUGNUMBER', which will attach several files we need for debugging.

[This is an automated message. Apologies if it has reached you inappropriately; please just reply to this message indicating so.]

[Stefan K. (astron)]

Apport-collect only seemed to give me "Package xorg-server not installed and no hook available, ignoring" and an information box saying "Will not uplad anthing more" or similar. So, I manually attached these files, hope they are the right ones.

[Stefan K. (astron)]

Is there any news on this bug or anything I should do?

[Bryce Harrington (bryce)]

Hi Aaron, strange that it didn't work. Thanks for the Xorg.0.log.

Are you still experiencing this bug? Does it also occur if you boot an oneiric livecd image?

Can you attach a photo of the screen showing the glitches?

Also please attach the output from 'sudo dmesg' from after the bug occurred.

[Stefan K. (astron)]

No, doesn't seem to happen in Oneiric. Let's close this, then.

[Stefan K. (astron)]

Btw: getting a screenshot would have been hard, because it happened "randomly," and seemed more like a flicker.

[Launchpad Janitor (janitor)]

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