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change screen brightness

I do:
Code: [Select]
cat /sys/class/backlight/intel_backlight/brightness
851

I try:
Code: [Select]
echo 100 > /sys/class/backlight/intel_backlight/brightness
And I get an input/output error.

If I load plasma libraries by opening up dolphin, then it works fine.  But i'd rather be able to do without plasma/kde libraries.

Re: change screen brightness

Reply #1 –
The easiest method to control backlight is using ACPI interface
I useacilight to control backlight.
maybe you need to follow the setup instruction mentioned in the gitlab of acpilight.

Re: change screen brightness

Reply #2 –
On my laptop, I added a toolbar (XFCE4) containing four nice icons to adjust the screen brightness:
Code: [Select]
sudo pacman -Sy acpilight
(a backward-compatible xbacklight replacement)

Then, I created 4 or 5 launchers with nice icons in a toolbar:
xbacklight =1
xbacklight =10
xbacklight =50
xbacklight =100