I have been doing some test with the mainline kernels. I have found that the backlight works well when using Ubuntu 13.04 amd64 with the last 3.6 based kernel.
It does not work with 3.7, 3.8 or 3.9 based kernels (all from http://kernel.ubuntu.com/~kernel-ppa/mainline/) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1163418 Title: Backlight is off when switching to discrete AMD GPU using vga_switcheroo and can't be turned on To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1163418/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
