This is kind of expected since it is common that systems from 2011 use ACPI video interface. You can add the kernel into /etc/default/grub to make it consist across boots.
I will compile a linux kernel with a workaround of "acpi_backlight=video" for testing. If this work I can submit to linux kernel and you will not need to add kernel parameters in the future. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894667 Title: [HP 635] Radeon 6310 brightness control does not work To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1894667/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
