Comment 122 for bug 133192

Bryce Harrington (bryce) wrote :

Hi Wouter and everyone,

I talked with upstream a bit about this AGPMode issue. It seems extremely hardware-specific as to what AGP Mode to use. So I coded up a quirk system that will let us build a table in the driver of ATI video cards vs. host bridges, and the AGP Mode they need. The data on the configurations I need for setting this is:

  * AGPMode value needed
  * Make/Model of laptop or motherboard
  * Output of lspci -vvnn
  * Is the system all factory hardware, or have any parts been replaced?
  * Is there an AGP Mode in the system BIOS?
    - If so, is it set to the factory default?

You can test various values of AGPMode by setting the option in your xorg.conf's Device section like this:

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

Possible values are 1, 2, 4, and 8.

For more details about this issue and the quirk, I've written a section about it in this page: https://wiki.ubuntu.com/X/Quirks