09-11-2019 06:51 AM
Basically the issue is this.
When the computer is in the discrete graphics bios mode, I am not able to set brightness of the laptops display.
If I install primus and bumblebee and set it to hybrid mode in the bios, I am able to change brightness, but DP external monitor output is not working.
I have tried a lot of things, none worked, to be able to set brightness on discrete only mode.
* xbacklight (does nothing, which makes me believe the problem is not at the keys themselfes, but rather something lower level that can't set it)
* tried booting with the acpi_backlight=vendor parameters in grub and also acpi_osi=Linux
* Section "Device"
Option "Backlight" "intel_backlight"
* echo -n 0 > /sys/module/video/parameters/brightness_switch_enabled
Brightness controls worked on Manjaro, but I was using the propietary drivers which I would like not to use.
Has anyone solved this for nouveu?
* Tried this app, https://github.com/haikarainen/light and got this:
No backlight controller was found, so we could not decide an automatic target. The current command will have no effect. Please use -L to find a target and then specify it with -s.
Listing device targets: sysfs/leds/tpacpi::thinklight sysfs/leds/input7::numlock sysfs/leds/input7::capslock sysfs/leds/tpacpi:ower sysfs/leds/input0::scrolllock sysfs/leds/input0::capslock sysfs/leds/tpacpi::standby sysfs/leds/input0::numlock sysfs/leds/tpacpi::thinkvantage sysfs/leds/input7::scrolllock sysfs/leds/tpacpi::kbd_backlight util/test/dryrun
I tried thinkvantage but that did nothing. According to this site, https://www.thinkwiki.org/wiki/Thinkpad-acpi, I should have under tpacpi:ower brightness, but I don't see it.