On 07/16/2019 04:10 AM, andre_debian@... wrote:
> Hello,
> 
> ls -al /sys/class//backlight/
> intel_backlight -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight
> 
> ls -al /sys/class/backlight/acpi_video0/
> no file
> 
> xbacklight is installed.
> 
> To adjust the brigtness :
> Menu => Trinity Configuration Center
> => P�riph�riques => Hardware Device Manager
> =>  Backlight => Intel HD Graphics 520
> and I can adjust the brightness from 0 to 100%,
> but the value is not keeped if I close the session.
> The default value = 62%
> 
> This is the situation.
> 

This is where you can create a script to monitor intel_backlight and write the
value out to, e.g. /usr/local/share/${USER}-backlight

cat /sys/class/backlight/intel_backlight/brightness >
/usr/local/share/${USER}-backlight

Then simply create another script (linked within ~/.trinity/Autostart) that
will restore the brightness level on trinity startup, e.g.

#!/bin/sh

savedbl="/usr/local/share/${USER}-backlight"
sysfile="/sys/class/backlight/intel_backlight/brightness"

if [ -s "$savedbl" ]   ## if saved backlight file exists
then
    sudo sh -c "cat '"$savedbl"' > '"$sysfile"'"  ## restore saved backlight
fi

(just make sure the file is executable and that you have sudo privileges)

-- 
David C. Rankin, J.D.,P.E.