Created attachment 948312 [details] dmi command output Description of problem: The backlight control buttons (Fn+F5 for dimming, Fn+F6 for brightening) do not change the brightness on ASUS Zenbook UX301LA. Following the troubleshooting guidelines here: http://hansdegoede.livejournal.com/13889.html the dmi.log and dmesg output are attached for kernel version 3.16.1-301.fc21.x86_64 included in the Fedora 21 alpha release. No onscreen display is shown when pressing the backlight control keys and evemu-record does not show any events occurring when pressing these buttons for any input device.
Created attachment 948313 [details] dmesg output
This is a known issue. The upstream kernel cannot handle the way these machines have their devices setup in ACPI. See https://bugs.freedesktop.org/show_bug.cgi?id=81762
*********** MASS BUG UPDATE ************** We apologize for the inconvenience. There are a large number of bugs to go through and several of them have gone stale. Due to this, we are doing a mass bug update across all of the Fedora 21 kernel bugs. Fedora 21 has now been rebased to 3.18.3-201.fc21. Please test this kernel update (or newer) and let us know if you issue has been resolved or if it is still present with the newer kernel. If you experience different issues, please open a new bug report for those.
*********** MASS BUG UPDATE ************** This bug is being closed with INSUFFICIENT_DATA as there has not been a response in over 3 weeks. If you are still experiencing this issue, please reopen and attach the relevant data from the latest kernel you are running and any data that might have been requested previously.
Created attachment 1000546 [details] dmesg output
I have the same problem with a ASUS Zenbook UX31A, with kernel 3.18.8 on Fedora 21. Strangely, the control buttons where working with my previous F19 installation.