You can also try to verify sysfs interfaces such as below example $ ls /sys/class/backlight/ intel_backlight $ cd /sys/class/backlight/intel_backlight $ cat max_brightness 120000 $echo 120000 | sudo tee brightness $echo 60000 | sudo tee brightness
If this does not change brightness, something is wrong with VGA (or BIOS) brightness interfaces. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1890055 Title: Brightness control does not work with 5.4.0-42.26 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1890055/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
