1.3 KiB
Story: Today is my first day with Arch. Whatever problem I'm facing is clearly documented in Arch Wiki. I'm falling in love with the system. It's just another level. I feel like I don't even need to create TIL files anymore as everything is just couple of keystrokes away. I'll see how it goes.
Read this and you are done :D
Here is the tl;dr part.
Run ls /sys/class/backlight/ to see which graphics card is managing your backlight. I'm assuming you get an ouput like intel_backlight. Then run this:
ls /sys/class/backlight/intel_backlight
actual_brightness bl_power brightness device/
max_brightness power/ scale subsystem/ type uevent
Read the max_brightness value and then set your brightness to something smaller than that value:
cat /sys/class/backlight/intel_backlight/max_brightness
echo 100 > /sys/class/backlight/intel_backlight/brightness
Note: You should be root to execute the previous command. If you want to modify it without root priveleges:
/etc/udev/rules.d/backlight.rules
RUN+="/bin/chgrp video /sys/class/backlight/intel_backlight/brightness"
RUN+="/bin/chmod g+w /sys/class/backlight/intel_backlight/brightness"
and add yourself to the video group.
sudo usermod -aG video $USER
Now you can use light.