[Bug 29255] DisplayPort output distorted

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=29255

--- Comment #14 from Alex Deucher <agd5f at yahoo.com> 2010-08-27 11:06:46 PDT ---
Do things work any better on Dave's drm-fixes branch:
http://git.kernel.org/?p=linux/kernel/git/airlied/drm-2.6.git;a=shortlog;h=refs/heads/drm-fixes

There are a number of evergreen related display fixes there.

Also, Jonathan, can you attach a copy of your vbios?  As per your log:

[    1.975933] [drm] Connector 4:
[    1.976127] [drm]   VGA
[    1.976318] [drm]   DDC: no ddc bus - possible BIOS bug - please report to
xorg-driver-ati at lists.x.org
[    1.976627] [drm]   Encoders:
[    1.976818] [drm]     CRT1: INTERNAL_KLDSCP_DAC1

it looks like there is a bios bug there that may be part of the problem in your
case.  To access your vbios (as root):

cd /sys/bus/pci/devices/<pci bus id>
echo 1 > rom
cat rom > /tmp/vbios.rom
echo 0 > rom

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