The attached debdiff should reduce the problem.
When a virtual resolution smaller than 2048x2048 is required, 2048x2048
is set instead of the required virtual resolution. Usually 2048x2048 is
the highest virtual resolution which doesn't break direct rendering.
If a bigger virtual resolution is required (say 3000x3000) this
resolution will be set.
Here's how you can test the new behaviour:
:~$ python /usr/share/screen-resolution-extra/policyui.py 2024x768
:~$ grep Virtual /etc/X11/xorg.conf
Virtual 2048 2048
:~$ python /usr/share/screen-resolution-extra/policyui.py 3000x3000
:~$ grep Virtual /etc/X11/xorg.conf
Virtual 3000 3000
** Attachment added: "screen-resolution-extra_0.9.debdiff"
http://launchpadlibrarian.net/30270495/screen-resolution-extra_0.9.debdiff
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Screen stuck at suboptimal resolution due to virtual size
https://bugs.launchpad.net/bugs/412948
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