I installed "Brightness Controller", didn't help. I tried to change grub to acpi_osi=Linux and similar. Nothing helps. It is on max setting by default unchangeable. When I remove nomodeset, my screen starts blinking violently on each mouse move... What's going on?

uname -a                                              

Linux x 5.11.0-27-generic #29~20.04.1-Ubuntu SMP Wed x86_64 x86_64 x86_64 GNU/Linux



ubuntu-drivers devices

 - empty





Graphics:  Device-1: Intel vendor: Lenovo driver: i915 v: kernel bus ID: 00:02.0 

           Display: x11 server: X.Org 1.20.11 driver: intel resolution: 2880x1800~90Hz 

           OpenGL: renderer: Mesa Intel Xe Graphics (TGL GT2) v: 4.6 Mesa 21.0.3 direct render: Yes 

My computer is Lenovo Yoga. It's kinda better now that I use nvidia-drm.modeset=1 (doesn't flicker anymore) but it still has many issues, there are sometimes weird spots appearing on a screen. How can I force it to use NVIDIA drivers?