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<keybind key="XF86AudioRaiseVolume">
      <action name="Execute">
        <name>Son plus fort</name>
        <command>amixer -q set Master 5+ unmute</command>
      </action>
    </keybind>

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lspci | grep 00:02.0

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setpci -s 00:02.0 f4.b=xx

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usage: ./backlight {up|down|set <val>|get|toggle}

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KeyRelease event, serial 48, synthetic NO, window 0x1800001,
    root 0x7c, subw 0x0, time 8112530, (171,-17), root:(173,377),
    state 0x0, keycode 233 (keysym 0x1008ff02, XF86MonBrightnessUp), same_screen YES,
    XLookupString gives 0 bytes: 
    XFilterEvent returns: False

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$ ls -l /usr/local/bin/backlight.sh 
-rwxr-xr-x 1 root root 1663 25 août  14:42 /usr/local/bin/backlight.sh

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#!/bin/bash
# increase/decrease/set/get the backlight brightness (range 0-255)
#
 
# PCI device on which to operate
DEVICE=00:02.0

# Amount to raise/lower the backlight when called with "up" or "down"
AMOUNT=8

# Minimum backlight value reachable via "down"
MIN=1

# Default backlight level when toggling on
DEFAULT=64
 
#get current brightness in hex and convert to decimal
var1=$(setpci -s $DEVICE F4.B)
var1d=$((0x$var1))
case "$1" in
       up)
               # Calculate new brightness
               var2=$(echo "ibase=10; obase=16; a=($var1d+$AMOUNT);if (a<255) print a else print 255" | bc)
               echo "$0: increasing brightness from 0x$var1 to 0x$var2"
               setpci -s $DEVICE F4.B=$var2
       ;;
       down)
               #calculate new brightness
               var2=$(echo "ibase=10; obase=16; a=($var1d-$AMOUNT);if (a>$MIN) print a else print $MIN" | bc)
               echo "$0: decreasing brightness from 0x$var1 to 0x$var2"
               setpci -s $DEVICE F4.B=$var2
       ;;
       set)
               #n.b. this does allow "set 0" i.e. backlight off
               echo "$0: setting brightness to 0x$2"
               setpci -s $DEVICE F4.B=$2
       ;;
       get)
               echo "$0: current brightness is 0x$var1"
       ;;
       toggle)
               if [ $var1d -eq 0 ] ; then
                       echo "toggling up"
                       setpci -s $DEVICE F4.B=$DEFAULT
               else
                       echo "toggling down"
                       setpci -s $DEVICE F4.B=0
               fi
       ;;
       *)
               echo "usage: $0 {up|down|set <val>|get|toggle}"
       ;;
esac
exit 0

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<keybind key="XF86MonBrightnessUp">
<action name="Execute">
<name> Augmenter la luminosité</name>
<command>sudo /usr/local/bin/backlight.sh</command>
</action>
</keybind>

<keybind key="XF86MonBrightnessDown">
<action name="Execute">
<name> Baisser la luminosité</name>
<command>sudo /usr/local/bin/backlight.sh</command>
</action>
</keybind>