Trying to collect more information:

simon@laptop:~$ unity-settings-daemon --debug -r
[lots of debug information]
[using second terminal to run "xrandr -o right"]
(unity-settings-daemon:11712): Gdk-ERROR **: The program 
'unity-settings-daemon' received an X Window System error.
This probably reflects a bug in the program.
The error was 'XI_BadDevice (invalid Device parameter)'.
  (Details: serial 613 error_code 129 request_code 131 (XInputExtension) 
minor_code 48)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the GDK_SYNCHRONIZE environment
   variable to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)
Trace/Breakpoint ausgelöst (Speicherabzug geschrieben)
simon@laptop:~$

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https://bugs.launchpad.net/bugs/1462590

Title:
  unity-settings-daemon crashes using xrandr

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