G5 xorg problems with dual-head and Radeon 9600

[Benjamin Herrenschmidt]

On Fri, 2005-01-14 at 17:00 -0600, Eric Van Hensbergen wrote:
> Ben,
> Some time ago you hooked me up with a patch that fixed my dual-headed
> apple cinema display on a G5 kernel under Xfree86.  I've just migrated
> to xorg and spent a couple hours today trying to migrate the patch
> against the most recent xorg I could get (6.8.1.901 from the Gentoo
> xorg-x11-6.8.1.901.ebuild which says it has a patch for all your
> "current" radeon changes).
> 
> The behavior I'm seeing is that both displays come up and appear to be
> stable, but the color on Screen 1 seems to be messed up.  I have a
> green background instead of grey.  Looking at a GIMP color wheel, Red
> looks like shades of blue, green are shades of red, and blue are
> shades of green.  (in the attached image the lower three bar graphs
> should be in R G B even though they look like B R G).  This sounds a
> bit like
> something the SubPixelOrder option was meant to fix, but changing that
> (to either RGB or BGR) doesn't seem to make a difference.
> 
> I've attached the original XFree86 patch and my xorg.conf for
> reference and a bad cell phone snapshot of the distorted gimp color
> wheel.

The current X.org CVS head should work well, unless somebody messed it
up in the last month. Gentoo should make sure they get up-to-date with
what's in there.

Ben.