Tried following kernel parameters, 1. acpi_osi="!Windows 2012" 2. acpi_backlight=vendor 3. video.use_native_backlight=1 each of them can fix this bug.
Since upstream is going to change the default for video.use_native_backlight to 1, this bug can be fixed in later release after the patch is merged. ref: https://www.mail-archive.com/linux- ker...@vger.kernel.org/msg658581.html ** Changed in: linux (Ubuntu Trusty) Status: Confirmed => Triaged -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1250401 Title: [Dell Inspiron 5737] brightness could not be controlled by the indicator applet "System settings -> Brightness and Lock"" but sysfs works To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1250401/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
