Re: powerbook wakeup/boot display issue
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