I have a Radeon 9800 pro in my computer (non-laptop) and I think that I only have the problem with "switch user" when I use fglrx and when I use the free driver I instead have random lockups when running GL applications but "switch user" works.
I have a Radeon 9800 pro in my computer (non-laptop) and I think that I only have the problem with "switch user" when I use fglrx and when I use the free driver I instead have random lockups when running GL applications but "switch user" works.