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
** Changed in: xorg-server (Ubuntu)
Status: Incomplete => New
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
** Changed in: xserver-xorg-video-ati (Ubuntu)
Sourcepackagename: xorg-server => xserver-xorg-video-ati
** Summary changed:
- Radeon driver nonfunctional in Intrepid
+ [RV350] DRM/DRI failed on a Sony Vaio VGN-A270P
--
[RV350] DRM/DRI failed on a Sony Vaio VGN-A270P
https://bugs.launchpad.net/bugs/294853
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