[Bug 10418] Powerbook DVI out only works when booted with monitor attached

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=10418





------- Comment #44 from agd5f at yahoo.com  2007-10-17 06:26 PST -------
(In reply to comment #41)
> 
> I'll try, but I don't understand how this is supposed to explain the behaviour
> I described with those two Xorg instances, each having its own saved radeon
> context which gets restored on VT-switch-backs; if it was an ordering thing,
> shouldn't both instances fail to restore DVI out to proper colors...  instead
> of one having the radeon state restored to a good state, while the second
> instance always sets up the DVI output bad...

I think it's an ordering thing with the restoration of the external tmds regs. 
We don't currently save them, so they are left as initialized by the driver on
a VT switch.  So what I think is happening is that the first instance of the X
server sets up the external tmds regs properly, but in the wrong order relative
to the rest of the hw state (i.e., the external tmds regs may need to be
restored before the crtc is enabled).  when you switch to the other VT, the
external tmds regs are still set up from the first X server so when it restores
the rest of the regs everything works.  So I think it's an issue with when the
external tmds regs need to be written relative to the rest hw state.  You might
also try forcing a screen blank (dpms off) and see if that fixes the colors as
well.


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