Ubuntu
xserver-xorg-video-ati package

  1. Bug #413259
  2. Comment #39

Comment 39 for bug 413259

Revision history for this message
In , Stefan Nagy (stefan-nagy) wrote :

Created an attachment (id=30587)
dmesg log (RV250)

I can confirm this bug (with another ATI card - see below). Forcing the card into PCI mode using the driver option 'radeon.agpmode=-1' is the only solution for me (even though performance suffers); I tried AGP modes 1, 2, 4 without any results; option 'EXANoDownloadFromScreen' didn't work for me either.

I was affected by bug #444139 (https://bugs.launchpad.net/bugs/444139), so I used boot option 'radeon.modeset=1' to turn on KMS. Since then I'm affected by this bug. The only way to get rid of screen artifacts and font tearing (as shown by Gytis Raciukaitis) is boot option 'radeon.agpmode=-1'.

I attach the output of dmesg without option 'radeon.agpmode=-1'

01:00.0 VGA compatible controller [0300]: ATI Technologies Inc Radeon RV250 [Mobility FireGL 9000] [1002:4c66] (rev 01)