I want to make it so my laptop starts at a low brightness level, which is comfortable for my eyes and easy on the laptop's battery. I found some instructions here on AskUbuntu, and so by using this command:
... I discovered that the maximum brightness is
4080 and the ideal brightness that I want to have my laptop default to is
700. So, I edited my
/etc/rc.local file to have the following line in it:
echo 700 > /sys/class/backlight/acpi_video0/brightness
However, that didn't work. So, after a little more research, I tried this line:
echo 700 > /sys/class/backlight/intel_backlight/brightness
But that also changed nothing.
Now I'm a bit stuck. How do I get my brightness to start at the right level when I log in on my laptop?
Note: It seems that this problem may be made worse by another more general issue of commands not running at startup, which I've asked about in a separate question. I think some of the answers suggested so far may actually work in principle, but I can't verify any of them unless I'm sure my startup programs are executing at all.