[RV280 9250] Graphical glitches after resolution change with compiz enabled

This is a limitation of your graphics hardware.

Why that bug didn't occur in Gutsy?

In that case...

Please attach your /var/log/Xorg.0.log

I would like to admit, that the same bug occurs in Fedora 9.

The problem disappears whe disabling compiz.

This works perfectly fine on nvidia so it cannot be a compiz bug.

Thank you for taking the time to report this bug and helping to make Ubuntu better. You reported this bug a while ago and there hasn't been any activity in it recently. We were wondering is this still an issue for you? Can you try with latest Ubuntu release? Thanks in advance.

Try adding:

Option AGPSize "64"

to your devices section in xorg. conf. I had this problem when there wasn't enough video memory to make textures large enough to hold my entire workspace in.

HTH

Thanks for taking the time to report this bug and helping to make Ubuntu better. In the development cycle for Intrepid there have been some vast improvements in the open source ati video driver and we could use your help testing them. Could you please download the latest Alpha CD image of Intrepid and test this particular bug just using the Live CD? You can find the latest image at http://www.ubuntu.com/testing . Your testing can help make Ubuntu and the open source ati driver even better! Thanks in advance.

We're closing this bug since it is has been some time with no response from the original reporter. However, if the issue still exists please feel free to reopen with the requested information. Also, if you could, please test against the latest development version of Ubuntu, since this confirms the bug is one we may be able to pass upstream for help.

The bug still exists with the Interpid Ibex (installed on HDD and up-to-date).

Could you please add your '/var/log/Xorg.0.log' file and '/etc/X11/xorg.conf' file from you Intrepid install after experiencing the bug then?

I also have the same issue under intrepid with opensource ati driver, only with compiz enabled, with a ATI mobility radeon x300. Here's a screencast : http://upload.leservicetechnique.com/bugs/ati_resolution_screencast.avi

This bug can still be reproduced on jaunty alpha 2

Based on the description of the symptoms, it sort of sounds like this might be caused by an incorrect AGPMode setting, which is relevant when DRI is enabled. You should test if changing this makes the issue go away. In your /etc/X11/xorg.conf set AGPMode to various values like this:

 Section "Device"
      ...
      Option "AGPMode" "2"
 EndSection

Possible values include 1, 2, 4, 8. You can see what it's currently set to by looking in /var/log/Xorg.0.log. It's worthwhile to test all four values even once you find one that works. If this takes care of it for you, we may be able to establish a quirk to set it for your hardware combo

For more details on this, please see the "ATI AGP Mode Quirk" section at https://wiki.ubuntu.com/X/Quirks

We're closing this bug since it is has been some time with no response from the original reporter. However, if the issue still exists please feel free to reopen with the requested information. Also, if you could, please test against the latest development version of Ubuntu, since this confirms the bug is one we may be able to pass upstream for help.

Sorry for the last answer, this bug is now fixed.