on my Lenovo Thinkpad (with NVIDIA gpu) the brightness control keys are not working (the other FN keys are working). Also there is no slider for the brightness control in gnome.
What I have tried:
But none of them works. Only acpi_backlight=vendor gave me the slider back and when I press the FN keys, it shows that the brightness settings are changing, but it does not change the brightness.
I also see that the /sys/class/backlight folder is empty.
dnf upgrade did not help.
It does not work in the fedora live environment, too.
It works on Fedora KDE.
It works on opensuse tumbleweed gnome.
Do you have any idea?