View Full Version : [kubuntu] No Graphics Acceleration in Karmic -- NoAccel required

October 31st, 2009, 04:23 AM

just upgraded to Karmic. Awesome, except for one small but annoying issue:
After upgrading, I couldn't log in. Entering my password in kdm resulted in crashing and restarting of the X server (and me entering my password again, etc.)
Everytime, the agpgart_amd64 module reported

agpgart_amd64 0000:00:00.0: AGP 3.0 bridge
agpgart_amd64 0000:00:00.0: putting AGP V3 device into 8x mode

... after which dmesg revealed complaints like "mtrr: no MTRR for ... found".

Then, I remembered the NoAccel and ModeDebug options for xorg.conf, and lo and behold, X works when both are set to true. But graphics are really slow now.

I'm on an old BenQ Joybook (R22E) with a VIA chipset, using the openchrome driver (01:00.0 VGA compatible controller: VIA Technologies, Inc. K8M800/K8N800/K8N800A [S3 UniChrome Pro] (rev 01))

Any ideas how to get rid of the NoAccel without losing X?

January 10th, 2010, 09:21 PM

Instead of

Option "NoAccel" "true"
(you can delete that line)

look for

Section "ServerFlags"

and add the line

Option "AIGLX" "off"

This will obviously disable 3D acceleration but 2D acceleration will still be supported which makes the whole 2D graphics a lot faster. And since 3D acceleration of the UniChrome is quite bad anyway, you might not need it at all.