It is also possible that you are running recovery mode which basically skips many drivers, including VGA drivers.
You may want to install proprietary Nvidia GPU Drivers (example: https://www.cyberciti.biz/faq/ubuntu-linux-install-nvidia-driver-latest- proprietary-driver/) and reboot. I noticed you upgraded your Ubuntu from 20.10 to 21.04. Will you be able to run native 21.04 (ex. running from usb live) and check whether you can have brightness control without recovery mode? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1934464 Title: Brightness control is missing on HP Pavilion Gaming Laptop 15-dk0xxx To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1934464/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
