Public bug reported: The Ubuntu 20.04 beta installer/live system does allow to adjust the screen brightness via the control commands and the interface at
echo $value /sys/class/backlight/intel_backlight/brightness The action in the installer/live system does change the brightness appropriately. After performing the default install, most values for brightness does not reflect to actual_brightness. Example: echo 1 > /sys/class/backlight/intel_backlight/brightness echo `cat /sys/class/backlight/intel_backlight/max_brightness` > /sys/class/backlight/intel_backlight/brightness does not produce a difference. However, it does work in the live system/installier. The only difference after installation does happen on the following command: echo 0 > /sys/class/backlight/intel_backlight/brightness\\ which turns off the display. Is there any information that I can provide to debug this issue further? ** Affects: ubuntu Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1871713 Title: Backlight Brigthness not adjustable after install on Dell XPS 13 7390 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1871713/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs