Michał Kozub, could you please test the latest mainline kernel via http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.15-rc5-utopic/ and advise to the results?
If reproducible, could you please comment to using any of the following kernel parameters individually (not in combination): video.use_bios_initial_backlight=0 video.use_native_backlight=1 ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1315697 Title: 1002:68e0 [Asus K52Je] Backlight not working after boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1315697/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs