Bug#595033: xserver-xorg-video-ati: Only one display works at a time with RV620 [FirePro 2260] with two DisplayPort output

[Julien Cristau]

On Tue, Aug 31, 2010 at 16:59:47 +0200, Thomas PIERSON wrote:

> Package: xserver-xorg-video-ati
> Version: 1:6.13.1-2
> Severity: normal
> 
> Hi,
> 
> I have an issue with 2 monitors connected on two DislpayPort output. The card 
> is an ATI "FirePro 2260". And only one display can works at a time.
> $ lspci | grep VGA
> 02:00.0 VGA compatible controller: ATI Technologies Inc RV620 [FirePro 2260]
> 
> My issue looks like this archived bug : http://bugs.debian.org/cgi-
> bin/bugreport.cgi?bug=569970
> > The symptoms are that only one display can be driven at a time.
> It also talk about two DisplayPort connections.
> 
> So, the 2 monitor are connected and activated in clone mode :
> 
> $ xrandr
> Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 8192 x 8192
> DisplayPort-0 connected 1280x1024+0+0 (normal left inverted right x axis y 
> axis) 408mm x 255mm
>    1680x1050      60.0 +
>    1600x1200      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  
> DisplayPort-1 connected 1280x1024+0+0 (normal left inverted right x axis y 
> axis) 380mm x 305mm
>    1280x1024      60.0*+   75.0  
>    1152x864       75.0  
>    1024x768       75.1     60.0  
>    800x600        75.0     60.3  
>    640x480        75.0     60.0  
>    720x400        70.1
> 
> But only one display works. 
> After that if I run for example :
> xrandr --output DisplayPort-0 --left-of DisplayPort-1
> I have a black screen on the 2 monitors and I can't access to a terminal.
> 
> I noticed something else : When I turn off and on again the second monitor 
> (manually) an kernel error occurred :
> [18515.140220] [drm:radeon_process_aux_ch] *ERROR* Buffer to small for return 
> answer 1 6
> During some seconds, the main monitor get stranges color and lights intensity! 
> 
> It seem to be the same problem that the bug #569970 but I am not sure.
> Someone have an idea to solve this? 
> Tell me if you need other logs or informations.
> 
Please try the 2.6.35 kernel from experimental.

Cheers,
Julien
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