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: [email protected]
ReportedBy: [email protected]
QAContact: [email protected]
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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