Bug#488277: xserver-xorg-video-radeon: No longer uses correct resolution when a second screen is connected

Leo Spalteholz leo.spalteholz at gmail.com
Fri Jul 11 16:29:42 PDT 2008

I think I'm hitting the same bug.  Up until a week ago or so, my
external display was working fine at native res of 1680x1050.  I would
use the following command to activate it:
xrandr --output VGA-0 --auto

Then I updated to version 6.9.0 and the next time I started X I only
had a resolution of 1280x800 (the native res of my laptop panel) and
no amount of xrandr trickery would fix it.  The external display just
cloned the LVDS no matter what.  Even when I did something like:
xrandr --output LVDS --off  it would shut off the external display as

The laptop is a Compaq Presario R4025CA, with a ATI Radeon XPress
200m.  External monitor is a 22" widescreen LCD from Dell.

I dumped my xorg.conf and let dpkg-reconfigure make me a new one.  Now
xrandr thinks that its outputting 1680x1050, but it's really only
1280x800.  My external monitor reports it is getting 1280x800 input.
However, since xrandr reports 1680x1050, my desktop is that size, and
extends past the physical screen.

xrandr output:
Screen 0: minimum 320 x 200, current 1680 x 1050, maximum 1680 x 1200
VGA-0 connected 1680x1050+0+0 (normal left inverted right x axis y
axis) 473mm x 296mm
   1680x1050      60.0*+   60.0     60.0*
   1600x1024      60.0
   1400x1050      74.8     70.0     60.0
   1280x1024      75.0     59.9     60.0
   1440x900       60.2
   1280x960       60.0
   1280x800       60.0
   1152x864       75.0     74.8
   1280x768       60.0
   1024x768       75.1     75.0     70.1     60.0
   832x624        74.6
   800x600        72.2     75.0     60.3     56.2
   640x480        75.0     72.8     75.0     60.0     59.9
   720x400        70.1
LVDS connected 1280x800+0+0 (normal left inverted right x axis y axis)
330mm x 210mm
   1280x800       60.1*+   60.0
   1280x768       60.0
   1024x768       60.0
   800x600        60.3
   640x480        59.9
S-video disconnected (normal left inverted right x axis y axis)

I'm going to try and downgrade if I can find a package to see if that fixes it.


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