Pressing R+Select locks, and pressing again unlocks, that works fine.
However, the screen is turned OFF while R+Select is kept pressed, but will be turned ON again (with a black screen) as soon as the Select button is released. I would expect it to stay OFF until the unlock pattern is entered.
Note that assigning different key combos to Lock/Unlock does not change the problem - the screen will still turn ON as soon as the keys are released.
Ok, some progress: it only happens if I launch GMU from the command line - launching it as a regular app, the sleep mode works fine. So I believe it might not by GMU's fault.
With the following config:
Pressing R+Select locks, and pressing again unlocks, that works fine.
However, the screen is turned OFF while R+Select is kept pressed, but will be turned ON again (with a black screen) as soon as the Select button is released. I would expect it to stay OFF until the unlock pattern is entered.
Note that assigning different key combos to Lock/Unlock does not change the problem - the screen will still turn ON as soon as the keys are released.