[Bug 88431] Re: 'Monitor & Display' module in System Settings is not working.

[Dhaos]

There seem to be two separate issues here.  I've managed to find a fix
in some of the ubuntu forums for the first issue, and while I don't have
the links, I can share them here as I've just put them into practice
this morning:

TO THOSE WITH THE "BadDevice" ERROR:

I fixed this error by removing a few lines from my xorg.conf file.
Apparently the default file contains lines that handle input from tablet
devices.  If you don't have a tablet device, X will complain.

You want to find all unused input devices and comment them out, like
this:

#Section "InputDevice"
#	Driver		"wacom"
#	Identifier	"stylus"
#	Option		"Device"	"/dev/input/wacom"
#	Option		"Type"		"stylus"
#	Option		"ForceDevice"	"ISDV4"		# Tablet PC ONLY
#EndSection

#.. comment out any other unused device

And also comment out the corresponding entries in your ServerLayout:

Section "ServerLayout"
	Identifier	"Xinerama"
	Screen	0 "Screen0" 0 0
	Screen	1 "Screen1" LeftOf "Screen0"
	Screen	2 "Screen2" RightOf "Screen0"
	InputDevice	"Generic Keyboard"
	InputDevice	"Configured Mouse"
#	InputDevice     "stylus"	"SendCoreEvents"
#	InputDevice     "cursor"	"SendCoreEvents"
#	InputDevice     "eraser"	"SendCoreEvents"
	Option	"Xinerama"	"on"
EndSection

-- 
'Monitor & Display' module in System Settings is not working.
https://bugs.launchpad.net/bugs/88431
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