Try to add this kernel parameter: acpi_backlight=vendor acpi_osi=Linux
Add it to the end of the GRUB_CMDLINE_LINUX variable in the /etc/default/grub file.
Then run the* grub2-mkconfig -o /boot/grub2/grub.cfg* command …
I had the same problem with an older version of openSUSE and in Debian.
I solved the problem with adding the following kernel parameter in /etc/default/grub
Take your time. It’s a learning process.
When I first starting adding entries it appearing a bit overwhelming. All you have to do is click on “Edit” and look at one the previous entries.
Just copy and paste the previous entries below or above as it is in alphabetical and numerical order. Replace the model number with your number.
Use the preview changes to see how it appears. Click on the “Save” button to add your model. There is no time limit as there is in the forum.
Once you add and edit the wiki table two or three times you can get a handle on it.