ubuntu-x-swat team mailing list archive

[Lamer <Bakhelit@xxxxxxxxx>]

I have been experimenting recently with graphic drivers on my system and
I found a way how to get rid of screen flickering. So here is what
worked for my system:

In Ubuntu 9.10 is included Mesa 7.6 with Gallium3D (http://www.phoronix.com/scan.php?page=article&item=ubuntu_karmic_mesa&num=1), which adds DRI (Direct Rendering Infrastructure) support and improves 3D acceleration with opensource radeon driver for ATI cards not supported by AMD any more (like my radeon X1600). So trick is to enable KMS (Kernel Mode Switching) to make it work (it is disabled by default in Ubuntu) - you need to add bootup parameter for kernel: radeon.modeset=1 (http://www.phoronix.com/forums/showthread.php?t=19547). You can edit the options during bootup in grub menu (using F6) or add it to menu.lst to make the change permanent:
...
title		Ubuntu 9.10, kernel 2.6.31-16-generic
root		(hd0,1)
kernel		/boot/vmlinuz-2.6.31-16-generic root=/dev/sda2 ro quiet splash radeon.modeset=1
initrd		/boot/initrd.img-2.6.31-16-generic
quiet
...

After this change I could enable DRI for compiz which made it faster + I
was able to run some 3D accelerated games like Hiverise, also Google
earth now works without problem and other programs (Blender, Pymol,...)
works ok as well. Since it took me some time and lots of searching, I
hope it at least helps somebody experiencing the same problems.

-- 
Screen flickering in 3D applications with open source radeon driver.
https://bugs.launchpad.net/bugs/484157
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-ati in ubuntu.