Xrandr Larger Virtual Desktop with no Panning not Working

[Hesham Wahba]

Hi,

I'm running into an issue where I'd like to set a larger virtual desktop
than my monitor size but prevent panning it at the same time.  I'm
rendering everything using a compositing manager to a virtual desktop and I
don't want to scroll my 3D viewport offscreen whenever the mouse moves to a
different part of the virtual desktop.  Should something like the following
work?

xrandr --fb 2560x1600 --output DVI-I-2 --mode 1920x1080 --panning
2560x1600+0+0/1920x1080+0+0/0/0/0/0

I've tried many combinations, both programmatically and
non-programmatically and I get this error:

X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  29 (RRSetPanning)
  Serial number of failed request:  34
  Current serial number in output stream:  34

Is it just me?  Possibly a bug in the NVidia drivers?  I'm running X.Org
version 1.13.0 which should be the latest on Ubuntu 12.10.  Ultimately this
may not be an issue as the virtual desktop will render to a different
display than the main screen so I might get away with this being off and
just ensuring the other display always has the right resolution set.

Thanks very much for your help,
Hesham
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