Comment 15 for bug 2037307

If I lock the system while it is frozen (by closing the laptop's lid), the lock screen will be usable, but once I log back in, the system will still be frozen (until I kill the foreground process). However, the cursor will be a normal cursor instead of the "dragging" cursor.

Also, something I discovered: if I use two-fingers at once (multitouch), I can interact with the focused window. However, it is very limited and glitchy. As with before, the only way to return the system to a usable state is to kill the foreground process. All other events (including Alt-F2) except for TTY switching (Ctrl-Alt-F3) are still completely ignored by GNOME, rendering the system frozen.