Output of xrandr when the problem is present:
$ xrandr
Screen 0: minimum 320 x 200, current 1600 x 1200, maximum 1600 x 1600
VGA disconnected 1280x800+0+0 (normal left inverted right x axis y axis) 0mm x
0mm
TMDS-1 connected 1600x1200+0+0 (normal left inverted right x axis y axis) 367mm
x 275mm
1600x1200 60.0*+ 59.9
1280x1024 75.0 59.9
1152x864 74.8
1024x768 75.1 60.0
800x600 75.0 60.3
640x480 75.0 60.0
720x400 70.1
1280x800 (0x4d) 83.5MHz
h: width 1280 start 1344 end 1480 total 1680 skew 0 clock 49.7KHz
v: height 800 start 801 end 804 total 828 clock 60.0Hz
I had stored these two outputs when the problem was not present, and only
discovered later that they were different:
$ xrandr
Screen 0: minimum 320 x 200, current 1600 x 1200, maximum 1600 x 1600
VGA connected (normal left inverted right x axis y axis)
1280x800 60.0
1280x768 60.0
1024x768 60.0
800x600 60.3
640x480 59.9
TMDS-1 connected 1600x1200+0+0 (normal left inverted right x axis y axis) 367mm
x 275mm
1600x1200 60.0*+ 59.9
1280x1024 75.0 59.9
1152x864 74.8
1024x768 75.1 60.0
800x600 75.0 60.3
640x480 75.0 60.0
720x400 70.1
$ xrandr
Screen 0: minimum 320 x 200, current 1600 x 1200, maximum 1600 x 1600
VGA disconnected (normal left inverted right x axis y axis)
TMDS-1 connected 1600x1200+0+0 (normal left inverted right x axis y axis) 367mm
x 275mm
1600x1200 60.0*+ 59.9
1280x1024 75.0 59.9
1152x864 74.8
1024x768 75.1 60.0
800x600 75.0 60.3
640x480 75.0 60.0
720x400 70.1
(trying again, I am reproducing the second one)
--
[Hardy] Too low "logical" resolution with DVI output from 915G
https://bugs.launchpad.net/bugs/273306
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