G750JH, Asus-WMI, LCD Backlight dimming not working

[borillionstar]

On the Asus G750JH like many other Asus laptops have function keys to control both the keyboard backlight led's ( Fn + F3, Fn + F4 working) and the dimming of the lcd backlight. On mine they are Fn + F5 and Fn + F6 which have no effect.

Ubuntu Raring 13.04 AMD Downloaded Friday Sept. 26, 2013, Both Fresh Install and off of LiveCD

[ 13.492529] asus_wmi: ASUS WMI generic driver loaded
[ 13.556540] asus_wmi: Initialization: 0x1asus_wmi: BIOS WMI version: 7.9
[ 13.556692] asus_wmi: SFUN value: 0x4a0877<6>
[ 13.557552] input: Asus WMI hotkeys as /devices/platform/asus-nb-wmi/input/input5
[ 13.655064] asus_wmi: Backlight controlled by ACPI video driver

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1231845

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.14 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.14-trusty/

[Mario (mleone87-1)]

this bug also affects me

tried with ubuntu 14.10: present

tried with latest kernel 3.18.1: present