This seems to be caused by a bug in the compiz script.  When I run it
from the command line I see:

Checking for Xgl: not present. 
Detected PCI ID for VGA: 07:00.0 0300: 10de:0391 (rev a1) (prog-if 00 [VGA])
Checking for texture_from_pixmap: present. 
Checking for non power of two support: present. 
Checking for Composite extension: present. 
Comparing resolution (1920x1200
1200x1600) to maximum 3D texture size (4096
4096): [: 350: 4096: unexpected operator
[: 350: 4096: unexpected operator
Passed.
Checking for nVidia: present. 
Checking for FBConfig: present. 
Checking for Xgl: not present. 
Starting gtk-window-decorator
/usr/bin/compiz.real (video) - Warn: No 8 bit GLX pixmap format, disabling YV12 
image format
/usr/bin/compiz.real (video) - Warn: No 8 bit GLX pixmap format, disabling YV12 
image format


xdpyinfo | grep dimension of course returns more info than the script is 
expecting since I have two displays.  I also suspect that gtk-window-decorator 
--replace also needs to be made smarter here, in that it is only being called 
for display :0.0 and not :0.1 or something similar.  A good shell script person 
could probably fix all this easily - unfortunately, I'm not that person!  :-)  
I'm a good tester though.

-- 
compiz doesn't work with multiple X screens
https://bugs.launchpad.net/bugs/147814
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