On my HP 62-a35er with integrated intel gpu and discrete radeon gpu fix is not correct. If I don't add kernel parameter acpi_backlight=vendor backlight is off. As I tested at boot there are 4 items under /sys/class/backlight: acpi_video0 acpi_video1 intel_backlight radeon_bl1
After login brightness is controlled under acpi_video1 for some reason. But brightness was set under intel_backlight to 4394 (maximum 4882). Kernel version: 3.7.5-1 (currently I use Arch but believe that kernel in Ubuntu is roughly the same) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/765438 Title: On startup, the backlight is off on laptop To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/765438/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
