Ubuntu
xserver-xorg-video-ati package

  1. Bug #139210
  2. Comment #29

Comment 29 for bug 139210

Revision history for this message
Michal Suchanek (hramrach) wrote :

It is currently unknown how to fix this.

The change in the radeon driver fixed some configurations that required manual setting but broke some other configurations so that manual setting of the AGP mode is required.

I have no idea about AGP but my suspicion is that the radeon AGP driver authors did not reverse engineer enough of the original driver to set up the AGP mode flawlessly in all cases, and rely on the BIOS to do part of the work.

The card than has to be used in the mode for which the BIOS set it up, and it is not always obvious which mode it is, especially with some buggy BIOSes.