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DerPreis
n00b
Joined: 30 Jul 2018
Posts: 16
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 Posted: Thu Aug 30, 2018 6:31 pm Post subject: [solved] xbacklight no function |
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Hello,
I can't get xbacklight to work. If I use something like
| Code: | | xbacklight -dec -20 |
there is no function and no error.
I have an Optimus Laptop. It is possible to change the backlight brightness with
| Code: | | echo xxx > /sys/class/backlight/intel_backlight/brightness |
Have someone a solution for this?
Last edited by DerPreis on Fri Aug 31, 2018 11:19 pm; edited 1 time in total |
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Anon-E-moose
Watchman
Joined: 23 May 2008
Posts: 6248
Location: Dallas area
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| Posted: Thu Aug 30, 2018 6:34 pm Post subject: |
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Does the optimus have a function key for adjusting brightness?
_________________
UM780, 6.12 zen kernel, gcc 13, openrc, wayland |
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DerPreis
n00b
Joined: 30 Jul 2018
Posts: 16
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| Posted: Thu Aug 30, 2018 6:42 pm Post subject: |
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| Yes its FN+F11/F12. But they shouldn't be mapped yet, because I use i3 as windows manager without a desktop enviroment and have to map the keys myself |
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Anon-E-moose
Watchman
Joined: 23 May 2008
Posts: 6248
Location: Dallas area
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| Posted: Thu Aug 30, 2018 7:04 pm Post subject: |
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I saw something while googling brightness and it reference using acpi so I modified the acpi script /etc/acpi/default.sh
under cd) I added
| Code: |
video)
case $action in
displayoff) :;;
brightnessdown)
max=$(cat /sys/class/backlight/intel_backlight/max_brightness)
curr=$(cat /sys/class/backlight/intel_backlight/actual_brightness)
div=$((max / 10))
next=$((curr-div))
if [ $next -gt 0 ];
then
curr=$next
else
curr=0
fi
echo $curr > /sys/class/backlight/intel_backlight/brightness
;;
brightnessup)
max=$(cat /sys/class/backlight/intel_backlight/max_brightness)
curr=$(cat /sys/class/backlight/intel_backlight/actual_brightness)
div=$((max / 10))
next=$((curr+div))
if [ $next -lt $max ];
then
curr=$next
else
curr=$max
fi
echo $curr > /sys/class/backlight/intel_backlight/brightness
;;
*) uhd $*;;
esac
;; |
It allowed my function keys to work perfectly.
Edit to add: I guess you could make a script to just write values to the /sys/*/brightness file but I like using the function keys, values are between 0 and 100.
Using acpi it even works from the console.
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UM780, 6.12 zen kernel, gcc 13, openrc, wayland |
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khayyam
Watchman
Joined: 07 Jun 2012
Posts: 6227
Location: Room 101
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| Posted: Thu Aug 30, 2018 8:49 pm Post subject: |
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DerPreis ...
like the example posted by Anon-E-moose ... though without cluttering up 'default.sh', and the UUoC ;)
| /etc/acpi/actions/backlight.sh: | #!/bin/sh
set -e
backlight_sys_dir="/sys/class/backlight/intel_backlight"
read -r max_brightness < "${backlight_sys_dir}/max_brightness"
read -r curr_brightness < "${backlight_sys_dir}/brightness"
case "$1" in
up) increment="+ 10" ;;
down) increment="- 10" ;;
*) exit 1 ;;
esac
new_brightness=$(($curr_brightness $increment))
if $((new_brightness < 1)) || $((new_brightness > $max_brightness)); then
exit 1
else
echo "$new_brightness" > ${backlight_sys_dir}/brightness
fi |
You would then call 'backlight.sh' via 'default.sh' for 'brightnessup' and 'brightnessdown' (which 'acpi_listen' should show correspond to your brightness keys).
| /etc/acpi/default.sh: | case "$group" in
[...]
video)
case "$action" in
brightnessup) /etc/acpi/actions/backlight.sh up ;;
brightnessdown) /etc/acpi/actions/backlight.sh down ;;
*) log_unhandled $* ;;
esac ;; |
HTH & best ... khay |
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DerPreis
n00b
Joined: 30 Jul 2018
Posts: 16
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| Posted: Fri Aug 31, 2018 4:43 pm Post subject: |
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First of all thanks for the help. I particually understand the magic of acpi now...
At the moment state my FN+Brightnessdown is working. The FN+Brightnessup won't. I don't understand why.
I have mapped the backlight.sh up/down script in i3 to Alt+F11/F12 and its working there.
I tried to change the default.sh to only brightess up but it still only changes the brightness down... strange...
these are my files...
/etc/acpi/default.sh
| Code: | #!/bin/sh
# /etc/acpi/default.sh
# Default acpi script that takes an entry for all actions
set $*
group=${1%%/*}
action=${1#*/}
device=$2
id=$3
value=$4
log_unhandled() {
logger "ACPI event unhandled: $*"
}
case "$group" in
button)
case "$action" in
power)
/etc/acpi/actions/powerbtn.sh
;;
# if your laptop doesnt turn on/off the display via hardware
# switch and instead just generates an acpi event, you can force
# X to turn off the display via dpms. note you will have to run
# 'xhost +local:0' so root can access the X DISPLAY.
#lid)
# xset dpms force off
# ;;
*) log_unhandled $* ;;
video)
case "$action" in
brightnessup) /etc/acpi/actions/backlight.sh up ;;
brightnessdown) /etc/acpi/actions/backlight.sh down ;;
*) log_unhandled $* ;;
esac
;;
ac_adapter)
case "$value" in
# Add code here to handle when the system is unplugged
# (maybe change cpu scaling to powersave mode). For
# multicore systems, make sure you set powersave mode
# for each core!
#*0)
# cpufreq-set -g powersave
# ;;
# Add code here to handle when the system is plugged in
# (maybe change cpu scaling to performance mode). For
# multicore systems, make sure you set performance mode
# for each core!
#*1)
# cpufreq-set -g performance
# ;;
*) log_unhandled $* ;;
esac
;;
*) log_unhandled $* ;;
esac
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/etc/acpi/actions/backlight.sh
| Code: | #!/bin/sh
set -e
backlight_sys_dir="/sys/class/backlight/intel_backlight"
read -r max_brightness < "${backlight_sys_dir}/max_brightness"
read -r curr_brightness < "${backlight_sys_dir}/brightness"
echo $max_brightness, $curr_brightness
case "$1" in
up) increment="+ 375" ;;
down) increment="- 375" ;;
*) exit 1 ;;
esac
new_brightness=$(($curr_brightness $increment))
if (($new_brightness < 1)) || (($new_brightness > $max_brightness)); then
exit 1
else
echo "$new_brightness" > ${backlight_sys_dir}/brightness
fi
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acpi_listen
| Code: | video/brightnessup BRTUP 00000086 00000000
video/brightnessdown BRTDN 00000087 00000000
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I changed the value in brightness to 375 cause of the max of 7500... |
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khayyam
Watchman
Joined: 07 Jun 2012
Posts: 6227
Location: Room 101
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| Posted: Fri Aug 31, 2018 9:30 pm Post subject: |
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DerPreis ... you're missing a closing 'esac' for the 'case $action in power)', it should be:
| Code: | case "$group" in
button)
case "$action" in
power) /etc/acpi/actions/powerbtn.sh ;;
*) log_unhandled $* ;;
esac ;;
video)
case "$action" in
brightnessup) /etc/acpi/actions/backlight.sh up ;;
brightnessdown) /etc/acpi/actions/backlight.sh down ;;
*) log_unhandled $* ;;
esac ;; |
If correcting that doesn't resolve the issue then post the output of the following:
| Code: | # find /sys/class/backlight/intel_backlight -maxdepth 1 -type f -print -exec cat {} \;
# ls -l /etc/acpi/actions/ |
Also note that "echo $max_brightness, $curr_brightness" is wasted, there is no TTY for that output, if you want that to go somewhere then you will need to use 'logger', eg:
| Code: | | logger "ACPI backlight: max_brightness: $max_brightness, curr_brightness: $curr_brightness" |
best ... khay |
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DerPreis
n00b
Joined: 30 Jul 2018
Posts: 16
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| Posted: Fri Aug 31, 2018 11:19 pm Post subject: |
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Awesome! It works now!
The missing "esac" was the mistake... the echo [..] was only for testing and is deleted now!
Thank you very much for this lesson, I definitely learned something! |
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khayyam
Watchman
Joined: 07 Jun 2012
Posts: 6227
Location: Room 101
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| Posted: Sat Sep 01, 2018 12:06 pm Post subject: |
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| DerPreis wrote: | | Awesome! It works now! |
DerPreis ... ok, good. You might also want to add the following under 'button)'
| /etc/acpi/default.sh: | mute) /usr/bin/amixer -q set Master toggle ;;
volumeup) /usr/bin/amixer -q set Master 2dB+ unmute ;;
volumedown) /usr/bin/amixer -q set Master 2dB- unmute ;; |
| DerPreis wrote: | | Thank you very much for this lesson, I definitely learned something! |
You're welcome & best ... khay |
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