Sounds like perhaps the virtual buffer is not resizing after being set
to 1600x1600, however this card's max texture buffer size is way larger
than that so it's not a hardware limitation.
Try sticking this in your /etc/X11/xorg.conf, restarting X, and see if
you can set it then:
Section "Device"
Identifier "Configured Video Device"
EndSection
Section "Monitor"
Identifier "Configured Monitor"
EndSection
Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
SubSection "Display"
Virtual 2966 1668
EndSubSection
EndSection
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
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which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/873747
Title:
Two displays, proper resolution cannot be set!
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/873747/+subscriptions
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