On Tue, 2007-02-06 at 17:00 +1100, Benjamin Herrenschmidt wrote: > > > > There seems to be a race condition somewhere which sometimes causes this > > when setting a video mode. I can usually get back the correct display by > > forcing a mode set, e.g. by switching between console and X. > > The problem seems to be due to the panel powerup sequence. It looks like > you need to do a well timed sequence of events when toggling the various > LVDS related control bits for the panel to come reliably up. However, > from trial & error, I've never been able to come up with a sequence that > works perfectly for everybody. I suspect differnent panel models require > different sequences.
Maybe this could be improved in radeonfb though, given that it doesn't seem to happen (or at least much less frequently) with the X radeon driver without UseFBDev? -- Earthling Michel Dänzer | http://tungstengraphics.com Libre software enthusiast | Debian, X and DRI developer
