Comment 27 for bug 1365336

Now that your system is working again, could you make some more tests?

Here are 4 alternative rules for your file /etc/udev/rules.d/71-nvidia.rules. Could you please test each of them and see if your system breaks?

First alternative (should work):
SUBSYSTEM=="drm", KERNEL=="card[0-9]*", TAG+="master-of-seat"

Second alternative:
SUBSYSTEM=="drm", KERNEL=="card[0-9]*", ATTRS{vendor}=="0x10de", TAG+="master-of-seat"

Third alternative:
SUBSYSTEM=="drm", KERNEL=="card[0-9]*", DRIVER=="nvidia", TAG+="master-of-seat"

Fourth alternative:
SUBSYSTEM=="drm", KERNEL=="card[0-9]*", ATTRS{vendor}=="0x10de", DRIVER=="nvidia", TAG+="master-of-seat"