[Bug 23387] [R300] Screen artifacts on X [KMS]

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=23387





--- Comment #12 from Stefan Nagy <public at stefan-nagy.at>  2009-10-20 07:27:09 PST ---
Created an attachment (id=30587)
 --> (http://bugs.freedesktop.org/attachment.cgi?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)


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