Take the 2-minute tour ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free, no registration required.

I am trying to get the LCD backlight brightness control to work properly on my new ASUS G75VW-DH72 laptop in Ubuntu 12.10. I got it to mostly work by following the instructions that I wrote here (acpi_osi=Linux acpi_backlight=vendor, EnableBrightnessControl=1). However, there are still two issues:

The main issue is that I have to press the hotkey (fn+F5 or fn+F6) TWICE before there is any effect on the brightness, or any output in the acpi_listen command. So if I run acpi_listen and press fn+F6 six times, the output only has three lines:

video LCDD 00000086 00000000
video LCDD 00000086 00000000
video LCDD 00000086 00000000

What causes this? How can I fix it? This behavior doesn't happen in Windows.

(Also, I noticed that the brightness is incrementing/decrementing in steps of 2 instead of 1, unless I happen to have a menu open. Any advice on that is welcome.)

share|improve this question

1 Answer 1

I was do the same as above. Then I had to Text my g75VW and closed the lid.

I come back after a while then I opened the lid and then the backlight was working with F5/F6 as it should be…

Only the onscreen display not showing…

I tried again with lid closing and after a while open it and it still working..

Hope it's helps.

share|improve this answer
    
Interesting. So it's working for you now? Can you run acpi_listen and tell me what you get when your press the Fn+F5 four times followed by Fn+F6 four times? Are you using the nvidia proprietary driver or nouveau (lsmod | grep nou)? –  David Grayson Dec 17 '12 at 19:08

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.