If xbmc starts with SDL_VIDEO_FULLSCREEN_HEAD=1 mouse hold inside second screen.
Pulseaudio and XBMC autostart
Using the xbmc.service did not start pulseaudio.
I ended up having to set a tty to autologin(getty) and start X in .bash_profile. (using geforce integrated ION and HDIM out)
XBMC shutdown/reboot polkit rules
I undid your modification to the XBMC page, as the polkit rule that enabes poweroff and rebooting when using the systemd service is not present in the current package, as you implied in your modification comment. You can check yourself here. Any reason you thought it was? I added a bug report mentioning this issue here. --Palmaway (talk) 03:31, 9 June 2013 (UTC)
It's not the exact udev rule, but placing the user in the 'power' group, and invoking the shutdown option works for me. This can be reversed by removing the user for the power group, logging out and back in, and invoking the shutdown option again. Now, the box does not go down; xbmc just exits. So functionally, that udev rule is not needed. Graysky (talk) 10:44, 9 June 2013 (UTC)
Are you running XBMC by enabling the systemd service? What you mention works if you run XBMC in other ways (xinit with autologin, direct execution...) but not for the systemd service, as in this case it will not register the session correctly therefore not enabling poklit. See this forum post for more details. --Palmaway (talk) 20:20, 9 June 2013 (UTC)