[Bug 9714] New: Radeon driver doesn't produce stable image on external display

bugzilla-daemon at annarchy.freedesktop.org bugzilla-daemon at annarchy.freedesktop.org
Fri Jan 19 12:30:01 PST 2007

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           Summary: Radeon driver doesn't produce stable image on external
           Product: xorg
           Version: 7.1
          Platform: Macintosh
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: wouter at telox.net

I have been trying to get my Dell 2407FWP to work on my powerbook, however the
image is not stable at resolutions above 1024x768.  This is way lower than the
native resolution of 1920x1200.  Driving the display at 1920x1200 does work,
however the image becomes wobbly.  This disturbance makes it very uncomfortable
to read text on the display.  When I display the X-diagnosis grid the
disturbance becomes even more apparent and manifests itself as blurry horizontal
bars that vary in position and intensity.

The display works fine when using OS/x or an older powerbook with a Radeon 9000
card instead of the Mobility Radeon 9600 M10.  The display is connected via VGA,
since the driver currently doesn't support DVI. My X.org version is 7.1.0.  Two
weeks ago I compiled the newest driver from git, but the result was the same.

I've tried every possible configuration I could think of that were capable of
driving the external display. The attached config contains some extra
information about the various things I tried (N.B. the exact same config works
on another powerbook with the radeon 9000 card). The most notable is the fact
that switching the explicit modelines on does really improve the overall
quality. When I let X decide not even 1024x768 is stable, and the resolutions
above that are a lot worse. When I do enable the modelines the amount of
disturbance lessens in every resolution. In 1024x768 it even causes the image to
be totally clear.

I have attached both my xorg.conf config, and two log files. The first showing
what happens without the modelines, the second shows what happens with the
modelines. I'd be happy to provide any extra information you need.          
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