I installed Lubuntu on my laptop that has an ATI RV250 card. But, there's video driver issues. I now understand that I need to disable KMS. I don't know how to do this so now I need to research/google. Thanks.
Once again, the problem is related to OSS drivers and some version of *Ubuntu. Yeah, so great that the ATI OSS and Ubuntu (oh, it's just fglrx that they care about working?) is on top of things.
Well, Ubuntu claims to "just work", so they should have disabled KMS by default on chips that don't work with it. I guess that means you should report it to the Ubuntu bug tracker.
But since you're using a laptop, I'd say your best bet is fglrx for increased battery life; the OSS drivers lack good power management.
As for the actual question, KMS is disabled by passing the "modeset=0" option to the radeon kernel module. I've built my own kernel with the radeon driver built-in and have it disabled by default, but I guess you're using the distro kernel. In that case, try looking in /etc/modprobe.d/ for a file called "options". In that file, add this: