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Dasharo
Display brightness not dark enough
The problem you're addressing (if any) Sitting in a dark room, the display brightness is not dark enough. Usually the brightness is decreasable till display turns off.
Describe the solution you'd like Using FN+F8 to decrease display brightness till display is almost completely dark.
Where is the value to a user, and who might that user be? Laptop is usable in rooms with low ambient light - like its possible with any laptop available.
Describe alternatives you've considered Using an addon in the browser to change white colour to black. But this doesnt work for pictures or any other program.
@fischtoeter we also need the device model and firmware version to help you
@miczyg1 @mkopec Can minimum display brightness level on NV4X ADL be set to even lower than it is right now? I feel I could work with even lower settings than the current minimum, and save some more battery charge when required. Where is it configured in code?
Looks like the backlight can go one step lower if you run echo 0 | sudo tee /sys/class/backlight/acpi_video0/brightness. The levels are defined here: https://github.com/Dasharo/coreboot/blob/clevo/release/src/mainboard/clevo/adl-p/acpi/backlight.asl
It's also interesting that Linux chooses to use acpi_video instead of Intel native backlight driver which provides smoother steps. Worth a look to see what can be done.
Brigthness levels are defined here: https://github.com/Dasharo/coreboot/blob/clevo/release/src/mainboard/clevo/adl-p/acpi/backlight.asl#L10 We can define as much steps as we want.
So it seems we have defined 20 levels, but the lowest one (level 0 - 5%) is not reachable via hotkeys. Allowing it to be reachable via hotkey would improve the situation already, IMHO, and possibly also resolve the issue originally reported by @fischtoeter
According to the spec: https://www.kernel.org/doc/Documentation/ABI/stable/sysfs-class-backlight 0 is a valid value, but it is not reachable via hotkeys in our case.
@macpijan Is it possible to solve this for a next NovaCustom Dasharo firmware release?
There are also some Minimum brightness fields in VBT, may be relevant here too.
Addressed by https://github.com/Dasharo/coreboot/pull/515 - lowered the minimum brightness level achievable via hotkeys.
