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# write-intel-brightness
This is a script to control screen brightness on Lenovo ThinkPad X220 and similar after you changed PWM frequency by writing a custom value to 0xC8254 register. I use it with acpid.
The script reads current PWM frequency from the register, calculates correct new brightness level for `/sys/class/backlight/intel_backlight/brightness` and writes it.
### Usage
To increase brightness:
```
write-intel-brightness +
```
To decrease:
```
write-intel-brightness -
```
### acpid example
From `/etc/acpi/default.sh` on my Gentoo box:
```
case "$group" in
video)
case "$action" in
brightnessup)
/usr/local/bin/write-intel-brightness +
;;
brightnessdown)
/usr/local/bin/write-intel-brightness -
;;
esac
;;
esac
```
### License
MIT
|
