The behavior I see does not quite fit into the 4 categories described in the document. Controls *seem* to work as function keys bring up the OSD and the bar can be moved up and down - only the screen's actual brightness does not change at all.
Okay, I tried the following: * added acpi_backlight=vendor to the kernel parameters => no changes in behavior and result. * looked at the /proc/acpi => no video there * looked at sys/class/backlight, found dell_backlight there with max brightness 15, actual_brightness can be changed with the fn-keys. Then I did: zordid@Dell-XPS:/sys/class/backlight/dell_backlight$ dmesg|grep 'ACPI: Video' [ 14.193426] ACPI: Video Device [PEGP] (multi-head: yes rom: no post: no) zordid@Dell-XPS:/sys/class/backlight/dell_backlight$ lspci | grep VGA 01:00.0 VGA compatible controller: nVidia Corporation Device 0dcd (rev a1) What else do you need? I do not quite understand the next "steps"... sorry! Can you give me a hint of what else is important? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/762670 Title: Laptop brightness on Dell XPS not controllable -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
