[Bug 32556] screen flickers all the time with desktop image appearing only briefly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=32556

--- Comment #26 from Gildas Le Nadan <3ntr0p13 at gmail.com> 2011-01-10 13:14:17 PST ---
(In reply to comment #25)
> re-opening as there are still some issues as we discussed on IRC.

After our discussion on IRC caused by the fact your patch was slightly
different than what I've tested, I've done the following tests:

1) DVI LCD screen VIEWSONIC 1680x1050 with DVI-DVI
Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 8192 x 8192
DVI-0 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 474mm
x 296mm
   1680x1050      60.0 +
   1400x1050      60.0  
   1280x1024      75.0    60.0  
   1440x900       59.9  
   1280x960       60.0  
   1152x864       75.0  
   1024x768       75.1     70.1     60.0  
   832x624        74.6  
   800x600        72.2     75.0     60.3     56.2  
   640x480        72.8     75.0     66.7     60.0  
   720x400        70.1  
   640x400        70.0 

OK   1680x1050 1280x1024 832x624 800x600 720x400
unstable   1400x1050 640x480 640x400
KO    1440x900 1280x960 1152x864 1024x768

2) LCD screen IIYAMA 1920x1200  with HDMI connector on HDMI
Screen 0: minimum 320 x 200, current 640 x 480, maximum 8192 x 8192
DVI-0 disconnected (normal left inverted right x axis y axis)
HDMI-0 connected 640x480+0+0 (normal left inverted right x axis y axis) 519mm x
324mm
   1920x1200      60.0 +
   1680x1050      60.0 +
   1600x1200      60.0  
   1280x1024      76.0     75.0     72.0     60.0  
   1440x900       75.0     59.9  
   1152x864       75.0  
   1280x720       60.0  
   1024x768       75.1     70.1     60.0  
   832x624        74.6  
   800x600        72.2     75.0     60.3  
   640x480        72.8     75.0     66.7     60.0  
   720x400        70.1  

KO except below 832x624. With 800x600, the image contain noise (flickering
horizontal color lines).

/!\ when connecting the VIEWSONIC with a HDMI-DVI cable, results are similar,
i-e no image except below 832x624.

3) ANALOG screen SILICON GRAPHICS connected on DVI with VGA adapter 
DVI-0 connected 1024x768+0+0 (normal left inverted right x axis y axis) 350mm x
280mm
   1280x1024      75.0  
   1024x768       75.1

OK for both resolutions

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