All, This is a problem that has plagued my HP8760w laptop (with NVidia Quadro 3000M) since installing Leap 42.2. When using the Nouveau driver, backlight control is provided via: /sys/class/backlight/acpi_video0 (the standard interface), and /sys/class/backlight/nv_backlight Within each of the backlight control directories, you have various parameters that allow you to obtain the maximum brightness value (max_brightness) to allow proper scaling of change requests and the (brightness) control interface allowing you to set the display brightness with values (0 - max_brightness). The problem is that most display interfaces (including laptop control keys) change the values within the acpi_video0 interface (0-20 scale), so for nouveau you end up having to set an inotiifywait watch on acpi_video0 and then update nv_backlight (0-100 scale) with changes. This works fine for nouveau. However, when the NVidia drivers are installed, the nv_backlight interface is removed from the system leaving only acpi_video0. acpi_video0 has no interface to display brightness itself. With Arch running on the same box, there is a kernel module (actually a couple of packages for it in AUR -- equivalent to buildservice/home packages) that provides the nvidia_backlight interface where backlight can be controlled in the same manner as with the nouveau interface. E.g. https://wiki.archlinux.org/index.php/NVIDIA/Tips_and_tricks#Enabling_brightn... https://aur.archlinux.org/packages/nvidia-bl/ https://aur.archlinux.org/packages/nvidiabl/ It is critical that there be some manner of backlight control provided when using the NVidia driver. While FW5/Gnome may provide hooks, for every other desktop the display brightness is stuck on HIGH with no way to turn it down or control the 'power' for the display backlight. xrandr does not adjust the display backlight. It adjusts the color brightness, which while it may have the same visible effect may have negative effects on battery life and component wear compared to proper backlight adjustment. Is there any way to address this for upcoming Leap 42.3? Can openSuSE provide a kernel module interface for backlight control with NVidia similar to what is done by the Arch AUR packages? (they continue to work with Linux 4.10, so there should be kernel compatibility without much, if any, patching required) This would take care a of heck of an annoyance for laptop users with NVidia hardware. -- David C. Rankin, J.D.,P.E. -- To unsubscribe, e-mail: opensuse-factory+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-factory+owner@opensuse.org