All, Laptop: HP 8760w, Quadro 3000M, nvidia-340xx packages. The driver works perfectly (no errors in Xorg.0.log), but I have no way to control the screen brightness. I've followed the suggestions in: https://wiki.archlinux.org/index.php/NVIDIA/Tips_and_tricks but I still have no backlight control. Using the laptop function keys, the values in /sys/class/backlight/acpi_video0/brightness are properly set, e.g. $ cat /sys/class/backlight/acpi_video0/brightness 8 (now tap the [func][F9], brightness lower, twice) $ cat /sys/class/backlight/acpi_video0/brightness 6 (actual_brightness value tracks brightness) $ cat /sys/class/backlight/acpi_video0/max_brightness 20 This works with OR without /etc/X11/xorg.conf.d/20-nvidia.conf: Option "RegistryDwords" "EnableBrightnessControl=1" Does anyone have any suggestions on anything else to try before I start loading the aur nvidia-bl or nvidiabl packages? I don't mind adding more software, but if there are a few more tweaks to try before going that route, I would like to try them first. Anybody get backlight working with a similar model laptop? -- David C. Rankin, J.D.,P.E.