[SOLVED] Stop screen brightness from decreasing when running on battery

Fixit7 · 07-16-2015, 10:46 PM

My vision is not what it used to be.

When I run only on battery power on my laptop, the screen brightness decreases a lot.

Is there a way to stop that ?

Stéphane Ascoët · 07-17-2015, 03:08 AM

I dont't know PuppyLinux but from a general point of view, I'd say that you'll have to look at ACPI management on the computer.

darry1966 · 07-17-2015, 04:17 PM

I found this http://murga-linux.com/puppy/viewtopic.php?t=87873

Fixit7 · 07-19-2015, 06:00 PM

I would to create a script that continually checks the status of the battery.

And execute xbacklight if "discharging" is detected.

This is what I have so far.

Quote:

cat /proc/acpi/battery/BAT0/state

Look for discharging and if so then

xbacklight -set 100

I am studying grep as I think it will be used as well. :-)

Stéphane Ascoët · 07-21-2015, 02:34 AM

Can be done in one line in a Cron task :-)

Fixit7 · 07-21-2015, 02:54 PM

* * * * * xbacklight -set 100 #Bright_Always_On

Stéphane Ascoët · 07-23-2015, 02:30 AM

Here you're just executing the same setting over and over. You have to put the "discharging" test before the xbacklight, and set another line to light it up again if the battery is charging... Personal note: this wouldn't work with mine, wich displays that battery is discharging even when on AC, so if I would want to do what you're doing, I should test the AC presence instead of the battery state.

Fixit7 · 07-23-2015, 09:04 AM

I can figure out how to do the discharging test.

Stéphane Ascoët · 07-23-2015, 09:28 AM

Something like "acpi -V | grep -q discharging && xbacklight -set 100 || xbacklight -set 200"
You'll have to read manuals and test commands on the command line

Fixit7 · 07-23-2015, 06:02 PM

It gave "command not found."

Fixit7 · 07-26-2015, 03:44 PM

Another way.

Quote:

#!/bin/bash
#2015Jul27 Greengeek script to sample battery charge state and perform some
#action depending on state.
#Note: possible states are charged, charging, discharging

number=1
while [ $number = 1 ]; do

BATTSTATE=$(grep charg /proc/acpi/battery/*/state | awk '{print $3}')

if [ "$BATTSTATE" = "discharging" ]; then
#echo "Battery is discharging"
xbacklight -set 100 &
fi
# check every 10 minutes
sleep 600
done