We probably need this patch to fix the issue. I have submitted this patch for SRU ago, but it will bring a pre-existing bug to light, so the kernel team reject it. I'll re-verify this patch now and re-send the SRU request.
commit d627b62ff8d4d36761adbcd90ff143d79c94ab22 Author: Lekensteyn <[email protected]> Date: Tue Jun 26 00:36:24 2012 +0200 i915: initialize CADL in opregion This is rather a hack to fix brightness hotkeys on a Clevo laptop. CADL is not used anywhere in the driver code at the moment, but it could be used in BIOS as is the case with the Clevo laptop. The Clevo B7130 requires the CADL field to contain at least the ID of the LCD device. If this field is empty, the ACPI methods that are called on pressing brightness / display switching hotkeys will not trigger a notification. As a result, it appears as no hotkey has been pressed. Reference: https://bugs.freedesktop.org/show_bug.cgi?id=45452 Tested-by: Peter Wu <[email protected]> Signed-off-by: Peter Wu <[email protected]> Acked-by: Jesse Barnes <[email protected]> Signed-off-by: Daniel Vetter <[email protected]> ** Bug watch added: freedesktop.org Bugzilla #45452 https://bugs.freedesktop.org/show_bug.cgi?id=45452 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1133168 Title: can't adjust brightness via hotkeys(Fn+F6/F6) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1133168/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
