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

[Julien Cristau]

reassign 595033 linux-2.6
tag 595033 fixed-upstream patch
kthxbye

On Tue, Aug 31, 2010 at 11:51:33 -0400, Alex Deucher wrote:

> On Tue, Aug 31, 2010 at 10:59 AM, Thomas PIERSON <web.pierson at gmail.com> wrote:
> > 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.
> 
> You need this patch most likely:
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=5137ee940c3e593ae5578a7a12a604eb8f239ac0
> which means 2.6.36rc3 or newer.
> 
Thanks for the pointer Alex, reassigning to the kernel package.

Cheers,
Julien
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