[Bug 22001] New: R4xxATOM option causes non-native LVDS modes to stop working properly on rv410

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=22001

           Summary: R4xxATOM option causes non-native LVDS modes to stop
                    working properly on rv410
           Product: xorg
           Version: git
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: chithanh at cs.tu-berlin.de
         QAContact: xorg-team at lists.x.org


Created an attachment (id=26302)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=26302)
Xorg.0.log

Due to bug 13353 comment 24, I have to use the R4xxATOM option in xorg.conf,
however the following problem appears when trying to use a non-native LVDS
mode:

Switching to a resolution other than 1280x800 with xrandr will display the
picture only in the top left corner of the screen. The screen area to the right
will remain dark. The screen area at the bottom will repeat the lowest line of
the desktop.
xrandr --output LVDS --set scaler center/full does not make any difference.

Using a full-screen application which uses a non-native mode (eg.
frozen-bubble) will cause the screen to display garbage at first and gradually
become totally white.
xrandr --output LVDS --set scaler center/full does not make any difference,
either. xrandr --output LVDS --set scaler off will make it work with a centered
image.

If the R4xxATOM option is disabled, then non-native modes work. I also tried
kernel modesetting from drm-next-radeon/radeon-gem-cs3 and  which exposes the
same bug if I boot with the radeon.r4xx_atom=1 kernel parameter.


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