Alex Barattini, thank you for advising on the potential fix commit. Regarding it http://www.spinics.net/lists/linux-acpi/msg47755.html , in order to test this patch, start by copying from the line where it notes: diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
to the last code line before the double dash: static int register_count; Your patch file should be exactly as shown, honoring all spaces, or lack thereof: diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index 995e91b..b3032f8 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -85,7 +85,7 @@ module_param(allow_duplicates, bool, 0644); * For Windows 8 systems: if set ture and the GPU driver has * registered a backlight interface, skip registering ACPI video's. */ -static bool use_native_backlight = false; +static bool use_native_backlight = true; module_param(use_native_backlight, bool, 0644); static int register_count; save this file to your Desktop as testfix.patch. Then execute at a terminal: git config --global user.email "y...@example.com" && git config --global user.name "Your Name" && git clone git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git ~/Desktop/linux-stable && patch ~/Desktop/linux-stable/drivers/acpi/video.c ~/Desktop/testfix.patch && git add . && git commit Now in the new window type: example press Ctrl+O -> Enter -> Ctrl+X. Then, type at a terminal: git log -n 1 | grep commit which should post the commit: commit <COMMIT> Use this commit in the below terminal command: git checkout <COMMIT> && cp /boot/config-`uname -r` .config && yes '' | make oldconfig && make-kpkg clean && CONCURRENCY_LEVEL=`getconf _NPROCESSORS_ONLN` fakeroot make-kpkg --initrd --append-to-version=-custom2 kernel_image kernel_headers && cd .. && sudo dpkg -i *.deb If for whatever reason the new kernel doesn't boot, it may not be you did something wrong, but just that it won't boot with this commit. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1261853 Title: 8086:0166 [Dell Inspiron 15R 5521] Impossible to adjust the screen backlight To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1261853/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
