[Bug 73286] New: X server does not find all resolutions on monitor connected via displayport

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73286

          Priority: medium
            Bug ID: 73286
          Assignee: xorg-driver-ati at lists.x.org
           Summary: X server does not find all resolutions on monitor
                    connected via displayport
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: guido-xorgbugs at unknownsite.de
          Hardware: Other
            Status: NEW
           Version: 7.7 (2011)
         Component: Driver/Radeon
           Product: xorg

Created attachment 91493
  --> https://bugs.freedesktop.org/attachment.cgi?id=91493&action=edit
xorg log

When I connect one of my monitors via DisplayPort, xrandr only shows
resolutions up to 1280x1024 for that monitor and won't let me select anything
higher than this:

===========
Screen 0: minimum 320 x 200, current 5120 x 1440, maximum 8192 x 8192
DisplayPort-0 connected (normal left inverted right x axis y axis)
   1280x1024      75.0     60.0  
   1280x960       60.0  
   1280x800       59.8  
   1152x864       75.0  
   1024x768       75.1     70.1     60.0  
   832x624        74.6  
   800x600        72.2     75.0     60.3     56.2  
   640x480        75.0     72.8     66.7     60.0     59.9  
   720x400        70.1
===========

The same model of monitor connected via DVI will instead give this output from
xrandr:

===========
DVI-0 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 518mm
x 324mm
   2560x1440      60.0*+
   1920x1200      60.0  
   1920x1080      60.0     50.0     59.9  
   1600x1200      60.0  
   1680x1050      59.9  
   1280x1024      75.0     60.0  
   1440x900       59.9  
   1280x960       60.0  
   1280x800       59.9  
   1152x864       75.0  
   1280x720       60.0     50.0     59.9  
   1024x768       75.1     70.1     60.0  
   832x624        74.6                                                          
   800x600        72.2     75.0     60.3     56.2                               
   720x576        50.0                                                          
   720x480        60.0     59.9                                                 
   640x480        75.0     72.8     66.7     60.0     59.9                      
   720x400        70.1
===========

This is with an ATI Radeon HD5870 card with radeon driver version 7.2.0.

I'm attaching a log file from the X server. This is with three connected
monitors, two via DVI, one via DisplayPort. The monitor connected via
DisplayPort was switched on only later during the operation of the X server.

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