I tried also: sudo su -c 'echo 10 > /sys/class/backlight/acpi_video0/brightness'.
Pressing the Fn keys brings up the OSD brightness control, which reflects the value of the /sys/class/backlight/acpi_video0/brightness file (and viceversa), but the actual screen brightness does not change. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/1720438 Title: brightness control broken nvidia Status in gnome-power-manager package in Ubuntu: Confirmed Bug description: Ubuntu 17.10 beta 2 Nvidia 310M, 340.x official driver installed with Additional Drivers program The brightness control built into the laptop (Dell Vostro 3300) isn't changing the brightness. Normally I can use Fn + Up/Down arrow keys to change the brightness. The brightness control works fine in Ubuntu 16.04 with the same driver series. I don't know if this is a GNOME 3.26 bug but it's likely as I'm having the exact same problem with Fedora 26 on this laptop. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/1720438/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
