Thanks for the bug report. That kernel looks old and should have been updated by now. Please try:
sudo apt install linux-generic-hwe-22.04 and reboot. ** Summary changed: - I cannot change or control display brightness + [Lenovo LOQ 15ARP9] I cannot change or control backlight brightness ** Package changed: xorg (Ubuntu) => linux-hwe-6.2 (Ubuntu) ** Changed in: linux-hwe-6.2 (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/2078814 Title: [Lenovo LOQ 15ARP9] I cannot change or control backlight brightness To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe-6.2/+bug/2078814/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp