SDB:AMD graphics troubleshooting
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An older version of this page can still be found at Archive:SDB:ATI_troubleshooting
If you have a Radeon HD 2000 series or higher, your performance will most likely benefit from running the proprietary fglrx driver. If, after rebooting, fglrx doesn't seem to be enabled, try running the aticonfig tool manually.
In case your display manager does not start, so while booting you only get the terminal mode logon prompt, this most likely is caused by a failure to start the X-server. So you logon as root and look at the end of /var/log/Xorg.o.log.
In case you see:
(WW) fglrx: No matching Device section for instance (BusID PCI:0@5:0:0) found (EE) No devices detected.
there is something wrong in the file /etc/X11/xorg.conf There should be only one section ServerLayout, Monitor, Device and Screen. If there are more equal sections, pick one and delete the other(s). Especially the Device section requires attention and pick the one that corresponds with the device that you see using the command
If the output is:
05:00.0 VGA compatible controller: ATI Technologies Inc RV770 [Radeon HD 4850]
the corresponding line in the Device section should be:
If, after having installed FGLRX, you find that X is unable to start. This procedure describes the process of re-enabling the open source radeon driver.
One of the first things fglrx does to ensure that radeon doesn't interfere with it is it blacklists the radeon module so that the kernel doesn't load it while booting.
When fglrx is installed, aticonfig creates xorg.conf containing configuration details for running fglrx. The default configuration files are in /etc/X11/xorg.conf.d/, so it's ok, in this case, to completely remove xorg.conf.
The next thing you'll want to do is to load the radeon module. Modprobe makes this easy:
Restarting X is relatively simple: [Ctrl]-[Alt]-[Backspace]+[Backspace]
Mesa is the open source implementation of OpenGL
Updating Mesa may improve performance, especially on older versions of openSUSE.
Replace "11.4" with your version of openSUSE.