Re: powerbook wakeup/boot display issue
On Tue, 2007-02-06 at 15:20 +0100, Michel Dänzer wrote:
> 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?
Happens for me with it every now and then too.
Ben.
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