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Old 05-04-2012, 08:08 PM   #1
Registered: Jul 2010
Location: Skynet
Distribution: Debian + Emacs
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multiple screen set up problem after Xorg update

Hey guys, I'm running an amd64 Gentoo system, with video provided by an on-board ATI chip set. The onboard graphics provides one DVI output and one VGA output.

Recently I upgraded my Xorg server to version 1.12.1. (I wanted the newer version so I could use a certain development library.) The upgrade was quite the ride, as I had to rebuild my graphics and input drivers. Anyway, I got graphics working again after I rebuilt the freedesktop ATI video driver.

However, before the upgrade I was able to go into dual screen Xinerama mode with this command:

xrandr --output VGA-0 --auto --left-of DVI-0
But now the command fails with:

xrandr: screen cannot be larger than 1280x1280 (desired size 2304x1024
So I am stuck in mirror mode, which is lame and pointless. xrandr recognizes both screens, but won't let me put them side by side:

$ xrandr 
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 1280 x 1280
VGA-0 connected 1024x768+0+0 (normal left inverted right x axis y axis) 376mm x 301mm
   1280x1024      60.0 +   75.0  
   1152x864       75.0  
   1024x768       75.0*    70.1     60.0  
   832x624        74.6  
   800x600        72.2     75.0     60.3     56.2  
   640x480        75.0     72.8     66.7     59.9  
   720x400        70.1  
DVI-0 connected 1024x768+0+0 (normal left inverted right x axis y axis) 370mm x 230mm
   1024x768       75.0*+
   800x600        85.1  
   640x480        85.0
I've attached the Xorg.log as well, hoping that will help.
Attached Files
File Type: log Xorg.0.log (211.5 KB, 6 views)
Old 05-04-2012, 10:35 PM   #2
Registered: Jul 2010
Location: Skynet
Distribution: Debian + Emacs
Posts: 467
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Apparently one has to set the "virtual screen" size, with the Virtual option in the xorg.conf file, so that the virtual screen is large enough to hold the real screens. I had this set in the old xorg.conf file but not in the new one.


multiple screens, xinerama, xorg update, xrandr

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