[Bug 26639] New: [radeon KMS] switching to res 1024x768 kills output

[bugzilla-daemon@freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=26639

           Summary: [radeon KMS] switching to res 1024x768 kills output
           Product: DRI
           Version: DRI CVS
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel@lists.sourceforge.net
        ReportedBy: liquid.acid@gmx.net


Created an attachment (id=33401)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=33401)
dmesg output

Hi there,

switching to resolution 1024x768 doesn't work on my hardware (RV740 + IBM P260
CRT), the CRT simply fails to receive a signal and shuts down.

xrandr output:
Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 8192 x 8192
DVI-0 disconnected (normal left inverted right x axis y axis)
DIN disconnected (normal left inverted right x axis y axis)
DVI-1 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 388mm
x 291mm
   1280x1024      85.0*+   75.0  
   1600x1200      85.0  
   1024x768       85.0     75.1     70.1     60.0  
   960x529        75.0  
   800x600        85.1     72.2     75.0     60.3     56.2  
   640x480        85.0     72.8     75.0     60.0  
   720x400        87.8     70.1  

1280x1024 is the standard mode and I just tried it: Every other mode works
completly fine - just the 1024x768 mode results in no signal.

No interesting output in dmesg when switching via xrandr.

Kernel is uptodate drm-linux branch of airlied's tree. But this also happens
with drm-radeon-testing. Not sure if it's a KMS problem, but at least it
happens with KMS enabled.

I can try a testrun with modeset disabled, if that helps.

Greets,
Tobias


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