Arch Linux

Lazer

Banned

Registered: 2007-08-02

Posts: 111

acer-wmi brightness

Hello!
I've got an Acer 9920G. When looking at the keyboard i could regualte the brightness with FN+ arrow right/left. This works under Windows XP and Ubuntu. But now I want to be able to do this under Arch Linux 64bit.
acer-wmi is in the kernel.
There is a directory named /sys/devices/platform/acer-wmi/
Inside there are the directories backlight, power, rfkill and the files interface, modalias, threeg, uevent and two links named driver, subsystem.
Inside /sys/devices/platform/acer-wmi/backlight/acer-wmi/
actual_brightness
bl_power
brightness
device   (again link)
max_brightness
power (directory)
subsystem (again link)
uevent

When i change the brightness with the arrowkeys, nothing happens, but when i turn off the display with fn+f6 and turn it on, the brightness changed.
Also i can see, that the value from 0-9 in actual_brightness changes every time i tap fn+arrow left/right.
value in brightness and max_brightness is always 9.

I hope you can help me changing the brightness without turning the display off and on.

Thank you.

paulstelian97

Member

Registered: 2016-01-13

Posts: 28

Re: acer-wmi brightness

You should look in /sys/class/backlight and try every folder, the /sys/class/backlight/intel_backlight/brightness file is the one working for me.

If that one works you should blacklist acer-wmi (i.e. avoid it loading and showing the interface).

On Ubuntu one you use a blacklist in /etc/blacklist.conf (though I'm not sure it works on MY version) to blacklist the module that doesn't control brightness. Then Linux will use the proper one after reboot.

x33a

Forum Fellow

Registered: 2009-08-15

Posts: 4,587

Re: acer-wmi brightness

@paulstelian97,

Thanks for the helpful first post, but in case you didn't notice the thread dates several years back and is unlikely to be helpful to the OP. So I will be closing this thread.

Closing.

fsckd

Forum Fellow

Registered: 2009-06-15

Posts: 4,173

Re: acer-wmi brightness

Not to mention, the OP is banned.

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