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Ubuntu Lucid Installation Guide

590 bytes added, 10:35, 19 June 2010
Add Section on Xserver problems
= Issues =
== Problems Starting Xserver ==
If you've properly installed the driver, but experience problems when starting the X server, such as hanging, black/white/gray screen, distortion, etc., your system BIOS may have a buggy ACPI implementation. To work around, press Ctrl+Alt+F1 to get to a terminal (or failing that, boot to recovery mode) and run:
$ sudo aticonfig --acpi-services=off
If this method works, you should consider checking your system vendor's BIOS changelogs for relevant ACPI fixes, updating your BIOS, and reenabling the driver's ACPI services.
== Slow Maximizing Windows/General 2D Slowness ==
As of Catalyst 10-6, a new, faster 2D acceleration method is used as the default, replacing the old XAA method. The new acceleration code was also available in Catalyst 10-2 through 10-5 (including the Catalyst that ships with Lucid), though it was not used by default. If you're using one of those versions, you can try the new acceleration code with the following command:
$ sudo aticonfig --set-pcs-str=DDX,Direct2DAccel,TRUE
Restart X (by logging out or rebooting) to apply the change. If you experience issues and want to return to the older, stable code:
$ sudo aticonfig --del-pcs-key=DDX,Direct2DAccel
If you're using Catalyst 10-6 or later, and are having problems with 2D operations, you may want to fall back to the old XAA. This command will do that:

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