I have an Nvidia GeForce GTX 560 Ti running nvidia-drivers 275.09.07.  It 
supports dual monitors via Twinview.  I have a Wacom Inspire3 6 x 8 Tablet.  
The tablet is working but it covers the entire display across both monitors 
and I'd like to restrict it to one monitor.

This is supposed to be done via

xsetwacom set "Wacom Intuos3 6x8 pad" MapToOutput VGA1

VGA1 is supposed to be the name of the display you want to restrict it to, and 
that name is supposed to be available via xrandr.  xrandr gives me the 
following output:

ddjones@kushiel ~ $ xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 2048 x 768, current 3360 x 1050, maximum 3360 x 1050
default connected 3360x1050+0+0 0mm x 0mm
   3360x1050      50.0* 
   2048x768       51.0  


ddjones@kushiel ~ $ xrandr --verbose
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 2048 x 768, current 3360 x 1050, maximum 3360 x 1050
default connected 3360x1050+0+0 (0x166) normal (normal) 0mm x 0mm
        Identifier: 0x165
        Timestamp:  13703
        Subpixel:   unknown
        Clones:    
        CRTC:       0
        CRTCs:      0
        Transform:  1.000000 0.000000 0.000000
                    0.000000 1.000000 0.000000
                    0.000000 0.000000 1.000000
                   filter: 
  3360x1050 (0x166)  176.4MHz *current
        h: width  3360 start    0 end    0 total 3360 skew    0 clock   
52.5KHz
        v: height 1050 start    0 end    0 total 1050           clock   50.0Hz
  2048x768 (0x167)   80.2MHz
        h: width  2048 start    0 end    0 total 2048 skew    0 clock   
39.2KHz
        v: height  768 start    0 end    0 total  768           clock   51.0Hz

I've tried guessing at the display name, trying VGA, DVI and LVDS with various 
numbers appended but xsetwacom simply complains that the display does not 
exist.

I've also tried setting the Coordinate Transformation Matrix as described 
here:

http://sourceforge.net/apps/mediawiki/linuxwacom/index.php?title=Dual_and_Multi-
Monitor_Set_Up#Dual_Monitors

I can set the matrix via the xinput command and xinput list-props for the 
device confirms that the matrix is set to the new value but it does not alter 
the behaviour of the tablet - it still spans both displays.  I set and 
confirmed the matrix for the pad, the eraser and the cursor.

Any advice or suggestions on how to either either identify the display names 
(or fix whatever issue causes xrandr not to display the info) or to otherwise 
restrict the tablet to one monitor would be greatly appreciated.

-- 
"Never explain. Your friends do not need it and your enemies will not believe 
you anyway." - Elbert Hubbard

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