Hi The native intel backlight controls do not work correctly on SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D laptops as I reported in https://bugs.freedesktop.org/show_bug.cgi?id=87286 (and https://bugs.debian.org/772440). Aaron Lu told me there to speak up here/to Rafael. Please find attached a patch to disable the native backlight on this laptop model, like it was already done for some other older models. I assume this would be the proper commit comments (or should it be signed-off?): Bug-Link: https://bugs.freedesktop.org/show_bug.cgi?id=87286. Reported-and-tested-by: Jens Reyer The patch applies to https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git branch linux-next, head at 389a8d43d64711b0e7282d227e05a6a71b43753d Rafael J. Wysocki 2015-02-12 22:43:26 I verified the issues are still present in linux-next and get solved with this patch. Just tell me if there is anything else I can do to get this applied. Thanks Jens Reyer/jre