Comment 18 for bug 178860

so. without acpi-support, i can still see the keypresses through acpi_listen, everything still works as before and gnome can still be convinced to start blinking (by pressing brightness down repeatedly) - but that is now much harder to trigger (and from the looks of it, it's a different bug)

i'll try to remove the udev keymap and see if the keys still work

interestingly, i never saw that one keypress would skip two brightness levels (that's what i would expect if the events really came in twice) - so either they didn't, or gnome-power-manager is doing some magic and filtering the duplicates