I noticed the similarity to the symptoms for the "Ignore TV Output
Quirk" at https://wiki.ubuntu.com/X/Quirks . While doing this directly
didn't work, I used VGA instead of TV to disable to VGA output:
In xorg.conf:
Section "Device"
...
Option "Monitor-VGA" "VGA"
EndSection
and the new section:
Section "Monitor"
Identifier "VGA"
Option "Ignore" "True"
EndSection
and it worked. Of course the problem with this is that connecting via a
VGA cable doesn't work anymore (No Screens found, and it falls back to
low-res VESA).
** Attachment added: "Xorg.0.log.IgnoreVGA"
http://launchpadlibrarian.net/17967789/Xorg.0.log.IgnoreVGA
--
[Hardy] Too low "logical" resolution with DVI output from 915G
https://bugs.launchpad.net/bugs/273306
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