I cannot get changing the display brightness to work. I have a Lenovo IdeaPad 5 with AMD Ryzen 4800u CPU and integrated Vega graphics.
I tried the following solutions: Grub property acpi_backlight, xbacklight, changing backlight directly in /sys/class/backlight/…, xgamma, xrandr, gdbus and setpci.
I followed instructions on these answers, but none of them worked:
- How do I set default display brightness?
- How do I decrease the display brightness an Acer 5830TG?
- Display brightness cannot be adjusted 18.04
- How to change LCD brightness from command line (or via script)? script
I can see, that values for e.g. xrandr or xgamma or backlight are set, but they have no effect on the notebooks display.
I guess that it has something to do with AMD drivers but I don't know…
Now I don't know in wich direction to search further. Maybe it's a driver or kernel thingy.
So, can anyone help? 🙂