Comment 14 for bug 1195509

these are the 2 relevant competing bugs...
https://bugs.launchpad.net/xmir/+bug/1206508 "Xorg crash on xmir punts user back out to greeter" which is the ctl+c issue on sw rendering - which this mp https://code.launchpad.net/~thomas-voss/mir/revert-process-group-leader-patch/+merge/177645 was intending to fix

and this bug which is fixed by https://code.launchpad.net/~mlankhorst/mir/setsid/+merge/176676