Aha...when I press the hotkeys, I can see the value in /proc/acpi/VID/LCD0/brightness change (the one which does nothing). So it's twiddling the wrong one (or there's an extra one when there shouldn't be).
Aha...when I press the hotkeys, I can see the value in /proc/acpi/ VID/LCD0/ brightness change (the one which does nothing). So it's twiddling the wrong one (or there's an extra one when there shouldn't be).