Hi. It was working until beginning of 2011. Now I have only two options of rotation, normal and upside down.
Here is some code from terminal:
$ xrandr --prop
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 320 x 240, current 1600 x 1200, maximum 1600 x 1200
default connected 1600x1200+0+0 (normal left inverted right) 0mm x 0mm
As you see, all four modes are detected - normal, left, inverted and right. But when I try to rotate left...
$ xrandr -o left
X Error of failed request: BadValue (integer parameter out of range for operation)
Major opcode of failed request: 153 (RANDR)
Minor opcode of failed request: 2 (RRSetScreenConfig)
Value in failed request: 0x640
Serial number of failed request: 14
Current serial number in output stream: 14
What can I say, this bug was requested on Archlinux and Ubuntu forums, nobody knows how to fix it. I'm waiting four months for any change, new versions of drivers where published and error is still the same. I'm waiting for suggestions or information why is it so hard to repair.
my video card model: nVidia GeForce 8600GT
current drivers version: nvidia 260.19.44
current Xorg version: X.Org X Server 184.108.40.2061 (1.9.5 RC 1)