# Re: \[PATCH\] Added backlight driver for Acer Aspire 4736

- From: Pradeep Subrahmanion \<hidden\>
- Date: 2012-03-19 17:03:33 
- List: linux-fbdev
- Page: https://ratatoskr.run/linux-fbdev/2012/03/3838170
- Thread: https://ratatoskr.run/linux-fbdev/2012/03/3835160/t.md

```text

> For the maximum level causes blank screen...
> 
> Please kindly help to identify which driver handle the brightness
> change, run the following 2 commands:
> 
> # echo 5 > /sys/class/backlight/acer-wmi/brightness 
> # echo 5 > /sys/class/backlight/intel_backlight/brightness 
> 
> Which one works to change brightness on your machine?

	Both  of them do not work for me.Only hot keys are working. 

Writing to /sys/class/backlight/acer-wmi/brightness 

and /sys/class/backlight/intel_backlight/brightness do not cause any 

change in brightness.


Regards , 

Pradeep Subrahmanion

> 
> 
> Thanks a lot!
> Joey Lee




```