Hi all, I installed Arch (Endeavour) on my Framework with KDE and so far everything is running pretty smoothly.
One of the few details I have not figured out is the ambient light sensor. I have seen texts about other Linux Distros that seem to imply that automatic brightness might work there out of the box but nowhere could I find any details about how the sensor or automatic brightness adjustment can be used. I also could not find any system setting that refers to this function.
Is anyone here able to shed some light on that ambient sensor topic? Where would I look for technical information enabling me to use it?
(Unfortunately I don’t have KDE on any of my systems, I’m mostly a tiling VM kind of person, and have never bothered with ambient sensors so best I can do is offer these hints on starting points. But given this, that last bash-based solution seems like something up my alley for when I throw some BSD and BSPWM onto the Framework I’m waiting for. )
The ambient light sensor on the Framework seems to match 1:1 with the raw illuminance values, though the raw illuminance can detect values over 100% brightness.
A glitch in the script causes it to go full brightness in dark rooms, and when fixing the glitch it looks like the code was attempting to compensate for the monitor as a light source.
This will need to be run as ‘sudo’. It works on Kubuntu 21.10.
while [ 1 ]
while [ $updated -gt 0 ]
if [ $backlight -gt $sensor ]
if [ $(($backlight - $sensor)) -gt $sensitivity ]
if [ $backlight -lt $sensor ]
if [ $(($backlight - $sensor)) -lt $sensitivity ]
if [ $target -gt $max ]
if [ $target -lt 1 ]
if [ $updated -gt 0 ]
echo “Starting brightness: $backlight”
echo “Ambient light: $sensor”
echo “Adjusted brightness: $target”
echo “Sensitivity: $sensitivity”
echo “Min: $min Max: $max”
echo $target > /sys/class/backlight/intel_backlight/brightness
Hi. The ambient light sensor works by default on Fedora, but on Arch does not. Has anyone had a success with making the auto brightness regulation work in Arch? What type/model of ambient light sensor is used in Framework laptop by the way? I found nothing on ArchWiki about that, tried Autolight from AUR which also doesn’t work. Please advise.
Update. Fonund the solution that worked for me by running the bash script from that guy:
Upd2: The script launches but works kind of weird, seems not regulating the brightness in dependence with the ambient light.
Ok, finally made it work. Replaced the original AmbientLightFix_intel code with the provided by Monster_user above using vim. Thanks for that! Then ran sudo AmbientLightFix_RunME.sh and the screen brightness auto regulation has started working as a service even after reboot.
The ambient light sensor in that thinkpad and also the framework does work out of the box indeed on Gnome at least. Even back in 2017. I disabled it as quickly as I could because it’s annoying. Shadow of your head moves across the sensor? Brightness does down and up again. And not as smoothly as you might like.
peter@raamwerk ~> monitor-sensor
Waiting for iio-sensor-proxy to appear
+++ iio-sensor-proxy appeared
=== No accelerometer
=== Has ambient light sensor (value: 80,069000, unit: lux)
=== No proximity sensor
Light changed: 80,016000 (lux)
Light changed: 76,273000 (lux)
Light changed: 80,123000 (lux)
Light changed: 80,069000 (lux)
Light changed: 79,807000 (lux)
Light changed: 77,801000 (lux)
Light changed: 80,278000 (lux)
Light changed: 79,910000 (lux)
I assume monitor-sensor is a part of iio-sensor-proxy (which is not a gnome package and doesn’t have any gnome dependencies).
Which implies Gnome might be the only DE that supports ambient light sensors trough iio maybe? That line of text might also be outdated. If other desktops support it, then I expect that to just work if iio-sensor-proxy is installed. And even if your desktop doesn’t support it you could install it anyway so you can at least verify the sensor works with monitor-sensor.
Installing this package and rebooting has worked for me. Arch Linux, Gnome. I can put my hand over the sensor and the screen dims in steps. It would be great if it was smoother, but anything is better than nothing.
If you - like me - are working with a ddc-enabled external monitor most of the time you will find that brightnessctl does not detect these. If you want to have the brightness of such an external monitor automatically adjusted along with the internal one, you can use another shell script daemon that I uploaded for you just now. Enjoy!
@Steel99xl Sorry for pinging you here, but I have a question about the auto brightness script you made via brightnessctl. Is there a way I can make it less sensitive? Your scripts seems like the ideal solution, but it just always results in setting the brightness to a much dimmer level than my environment. Maybe iio-proxy in interfering?
@Steel99xl Thanks! I adjusted that value and now its perfect for me! Just a suggestion, could you add a suggestion to your github page for this script that suggests that people adjust that value if they want a different outcome from this script?
/sys/bus/iio doesn’t exists in Ubuntu 22.04. Can some one tell how to activate this in Ubuntu 22.04? I have module_blacklist=hid_sensor_hub in my grub config file, to enable brightness keyboard switches.