Well, I've been playing with Debian testing for the last few months, and this is the first time I'm really stuck.
I was playing with modconf, and I decided to install some stuff that looked like it might reduce flicker and general slowness in KDE (namely radeonfb and the ATI DRM). Well, KDE didn't improve, but now I can't see my consoles (Ctrl-Alt-F1 etc just give a black screen). Googling around, I learned that apparently the radeon fb and DRM don't play well together. Ehm... okaaaaay...
Now my problem is how to remove the modules without getting the "Device in use" error. Someone please tell me how to do this?
(By the way, I can still use KDE, so I don't have to fix this without being able to see what I type I hope