Public bug reported: Pressing Fn + Brightness Up and Down results in the brightness indicator jumping randomly up and down, with no change to the actual brightness. This laptop uses a nvidia graphics card for display and brightness which is not supported by ubuntu's default configuration.
There is only one way that I have found to actually make the brightness go up and down: 1. Add acpi_osi=Linux acpi_backlight=vendor ro to /boot/grub/grub.cfg 2. Type echo 5 > /sys/class/backlight/nv_backlight/brightness And even with acpi_backlight=vendor switched on, using the Fn key to affect brightness still does not work, presumably because its trying to use dell_backlight, which does nothing. Output of ls /sys/class/backlight with acpi_backlight=vendor: root@r-Inspiron-1370:~# ls /sys/class/backlight dell_backlight nv_backlight root@r-Inspiron-1370:~# Normally this only contains acpi_video0 (off top of head so might be a typo). I think someone needs to make a patch to fix this bug. ** Affects: linux (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/994697 Title: Dell 1370 brightness not working, To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/994697/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs