[Bugme-new] [Bug 18072] New: Probing/modelines problem: native resolution not detected

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=18072

           Summary: Probing/modelines problem: native resolution not
                    detected
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.36-rc3
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
        AssignedTo: drivers_video-dri-intel at kernel-bugs.osdl.org
        ReportedBy: anisse at astier.eu
        Regression: No


Created an attachment (id=29292)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=29292)
Dmesg of wrong resolution/modeline detection, followed by xrandr commands.

On an all in one desktop computer, resolution won't be properly detected, and
it will show a black band on the right (screen shifted on the left).

Running xrandr auto-setting on "VGA1" output fixes it:
# xrandr
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 4096 x 4096
LVDS1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x
0mm
   1024x768       60.0*+   85.0     75.0     70.1     60.0* 
   832x624        74.6  
   800x600        85.1     72.2     75.0     60.3     56.2  
   640x480        85.0     72.8     75.0     59.9  
   720x400        85.0  
   640x400        85.1  
   640x350        85.1  
VGA1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 410mm x
230mm
   1366x768       60.0 +
   1280x720       60.0  
   1024x768       75.1     70.1     60.0* 
   800x600        75.0     60.3  
   640x480        60.0  
# xrandr --output VGA1 --auto
# xrandr
Screen 0: minimum 320 x 200, current 1366 x 768, maximum 4096 x 4096
LVDS1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x
0mm
   1024x768       60.0*+   85.0     75.0     70.1     60.0* 
   832x624        74.6  
   800x600        85.1     72.2     75.0     60.3     56.2  
   640x480        85.0     72.8     75.0     59.9  
   720x400        85.0  
   640x400        85.1  
   640x350        85.1  
VGA1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 410mm x
230mm
   1366x768       60.0*+
   1280x720       60.0  
   1024x768       75.1     70.1     60.0  
   800x600        75.0     60.3  
   640x480        60.0  


Lspci of this machine is in attachment 28041 .

Please note that to obtain this log, I used Daniel Vetters's intel-gtt-rework
branch, that fixed another boot-blocking bug 16891 .
Also, this bug might be a regression between 2.6.36-rc2 and 2.6.36-rc3, as
previous tests with -rc2 didn't show this behavior.

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