RandR + dual head - debugging

Andrej Krutak andree182 at gmail.com
Thu May 8 02:42:16 PDT 2008


couldn't find this info anywhere, so I'll try to get some info here, sorry for 

I recently switched to ubuntu hardy - x.org 1.4.1 / xserver 7.3 (or in 
whichever order these numbers are :-)).

I'm using dualhead configuration with recent ati drivers on ati X700 (I think 
the combination isn't the problem). I use xrandr utility to setup the 
configuration (xorg.conf didn't work - or at least there's no official 
documentation how to use xrandr there), it works pretty OK, but there's a 
catch. The command I use to set the resolution is a standard one:

xrandr --output VGA-0 --mode 1680x1050 --right-of LVDS

Recently (after the system upgrade) some apps begun to mess up the screen 
resolution (namely wine) when executed. The very simplest simulation of the 
problem is calling xrandr without any parameter(s). 

What happens is that the VGA-0 gets some strange resolution (I guess the same 
LVDS has, 1400x1050) and starts to mirror the LVDS.

Now I don't know at all where I should search for the bug (except for the 
sources ;-( ). Is there any possibility to debug the randr calls - without 
recompiling the xserver?

Best regards,

Andrej Krutak

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