Brightness control with integrated AMD GPU and NVidia GPU

[Tomasetti Romin]

System information
------------------

Distributor ID: Ubuntu
Description: Ubuntu Jammy Jellyfish (development branch)
Release: 22.04
Codename: jammy
Integrated AMD GPU: AMD Ryzen 7 5800H with Radeon Graphics
GPU : NVIDIA GA106M [GeForce RTX 3060 Mobile / Max-Q] with nvidia-driver-510

Description of the problem
--------------------------

I can't change the brightness of the screen using the hot keys or the settings menu.

It is clear that these buttons are acting on the value stored in /sys/class/backlight/nvidia_0/brightness, but has no effect on the actual brightness.

However, modifying manually the value in /sys/class/backlight/amdgpu_bl0/brightness changes the actual brightness.

Troubleshooting attempts
------------------------

If I downgrade the nvidia dirver from 510 to 470, controlling brightness works fine.

Using nvidia-driver-495 also works fine.

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Libera.chat.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1961039/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Andreas Niemann (andnie)]

Intel CPU with only
01:00.0 VGA compatible controller: NVIDIA Corporation TU104BM [GeForce RTX 2080 Mobile] (rev a1)

same Problem!
brightness control not working!
Last time working was with real 460 drivers!