Brightness issues

[will1982]

Whenever I wake up my laptop from sleep or start it up, brightness is set to max.
Is there any way I can set it lower by default?

[pqwoerituytrueiwoq]

if we can find a command that will affect the backlight yes

xbacklight -set 50

does that work on your system?

[will1982]

It does not work...

[NikTh]

Give the results of this command

ls /sys/class/backlight/*/

Thanks

[will1982]

Here you go:

/sys/class/backlight/acpi_video0/:
actual_brightness  brightness  max_brightness  subsystem  uevent
bl_power           device      power           type

/sys/class/backlight/apple_backlight/:
actual_brightness  brightness      power      type
bl_power           max_brightness  subsystem  uevent

/sys/class/backlight/intel_backlight/:
actual_brightness  brightness  max_brightness  subsystem  uevent
bl_power           device      power           type

[pqwoerituytrueiwoq]

you may need to edit the BOLD parts of this post for this to work for you based on the output of ls /sys/class/backlight/
I just made a script
this is meant as a replacement for xbacklight

sudo apt-get remove xbacklight
gksu gedit /usr/local/bin/xbacklight
sudo chmod +x /usr/local/bin/xbacklight
sudo chmod 777 /sys/class/backlight/acpi_video0/brightness

script:

#!/bin/bash
where="/sys/class/backlight/acpi_video0"
max=`cat $where/max_brightness`
current=`cat $where/actual_brightness`
if [ "$1" == "--set" ];then
    if [ ! "`echo $2 | sed 's/[a-Z]//g'`" == "$2" ];then
        `dirname $0`/`basename $0`
        exit
    elif [ 0`echo "$2" | sed 's/.//' | grep "^[0-9]*$"` -gt 0 ] && [ ! "`echo \"$2\" | grep \"^[0-9]*$\"`" == "$2" ];then
        if [ "`echo ${2:0:1}`" == "+" ];then
            X=$(($current+`echo ${2:1}`))
        elif [ "`echo ${2:0:1}`" == "-" ];then
            X=$(($current-`echo ${2:1}`))
        else
            echo "${2:0:1} is not a +/-"
            exit
        fi
        if [ $X -gt $max ];then
            echo $max > $where/brightness
        elif [ $X -lt 0 ];then
            echo 0 > $where/brightness
        else
            echo $X > $where/brightness
        fi
        exit
    fi
    if [ ! "`echo \"$2\" | grep \"^[0-9]*$\"`" == "$2" ];then
        echo "$2 is not a Intiger"
    elif [ "$2" -lt $(($max+1)) ] && [ "$2" -gt -1 ];then
        echo $2 > $where/brightness
    elif [ "$2" -lt 0 ];then
        echo 0 > $where/brightness
    else
        echo $max > $where/brightness
    fi
elif [ "$1" == "--get" ];then
    if [ "$2" == "current" ];then
        echo $current
    elif [ "$2" == "max" ];then
        echo $max
    else
        echo -e "Current: $current\nMaximum: $max"
    fi
else
    echo -e "Usage:\n\t`basename $0` --set Int | +Int | -Int"
    echo -e "\t`basename $0` --get current | max | NULL"
fi
exit

This makes the script not need sudo every time you reboot:

sudo sed '/^[^#]*exit 0/i chmod 777 /sys/class/backlight/acpi_video0/brightness \&' -i /etc/rc.local

[NikTh]

Hi ,
is this script really needed ?
I mean
I would ask for the results of

sudo cat /sys/class/backlight/acpi_video0/brightness
sudo cat /sys/class/backlight/apple_backlight/brightness
sudo cat /sys/class/backlight/intel_backlight/brightness

Then we can see what value affects the brightness
with

echo "VALUE" | sudo tee /sys/class/backlight/acpi_video0/brightness

bolds may change..

and after we found what is the correct command , we could just add the command to /etc/rc.local .

By the way , I don't know coding - scripting , I admire "scripters" and I wish will work.

Thanks

[pqwoerituytrueiwoq]

the script i made would pre-process the command you gave
as long as VALUE is a valid value your command is the same as my script (except mine cat tell you your brightness and max brightness)
with the script i made you could put xbacklight --set VALUE in the /etc/rc.local script
could also make custom keyboard shortcuts for it to increase/decrease brightness

there was one person who was not able to set the brightness in /etc/rc.local but it worked from a lightdm startupscript
but that was using xbacklight whch may act like numlockx and require lightdm to be running to work

[NikTh]

could also make custom keyboard shortcuts for it to increase/decrease brightness

OK!

This is the advantage of your script .

Cuz all other things seems to me the same.. But shortcuts , OK, this is an advantage.

[pqwoerituytrueiwoq]

These are good for calling it from a script (i assume the min is 0 for everyone)
xbacklight --get max
xbacklight --get current
This is good for humans
xbacklight --get
This is to increase the brightness
xbacklight --set +2
This is to decrease the brightness
xbacklight --set -2
This is to set the brightness
xbacklight --set 5
This is for the help output
xbacklight
xbacklight --help
xbacklight -h
xbacklight "I dont know what I am doing"