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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Team, which is a bug contact for kde-guidance in ubuntu.

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