Delighted it’s resolved. Yeah, it’s a good bet on some computers, less so for ours. Glad things are working again. 
This works great, thanks !
I had to set SensorToDisplayScale to 1 instead of 25, though
1 Like
Thought I would show off the new version of this script
It now can be stop, started, and kill (some what like a service), and with a easily modifiable sensor offset that can be changed while running (flags provided to the script ran separately will directly modify the offset)
Also the brightness only changes when the sensor sees a X% of change (10% by default)
All, please remember this is a non-Framework tested/supported project - all bugs/questions best sent to their Github page. Thanks
On Kernel 6.7-rc1 ; with cros_ec patch applied for the amd FW13 and I see :
[ 8.849390] hid_sensor_als HID-SENSOR-200041.1.auto: failed to setup attributes
[ 8.849397] hid_sensor_als: probe of HID-SENSOR-200041.1.auto failed with error -1
And don’t get anything populated in /sys/bus/iio/devices at all.
aenertia@emiemi:~$ modinfo hid_sensor_als
filename: /lib/modules/6.7.0fw13c-rc1+/kernel/drivers/iio/light/hid-sensor-als.ko
import_ns: IIO_HID
license: GPL
author: Srinivas Pandruvada <srinivas.pandruvada@intel.com>
description: HID Sensor ALS
rhelversion: 9.99
alias: platform:HID-SENSOR-LISS-0041
alias: platform:HID-SENSOR-200041
depends: hid-sensor-iio-common,hid-sensor-trigger,hid-sensor-hub,industrialio
retpoline: Y
intree: Y
name: hid_sensor_als
vermagic: 6.7.0fw13c-rc1+ SMP preempt mod_unload
sig_id: PKCS#7
signer: Build time autogenerated kernel key
sig_key: 74:33:0F:DC:FA:4D:00:8B:30:C3:08:76:96:56:49:71:39:1F:E3
sig_hashalgo: sha512
signature: 84:56:72:79:C7:62:DC:16:13:08:19:36:60:88:42:50:A8:93:8A:66:
A8:FB:AB:2B:3E:6E:74:3E:C3:69:EC:99:85:D6:BF:AA:5E:4A:76:83:
15:05:0A:99:91:51:8A:C7:B1:CE:DF:85:41:9D:EA:6B:51:97:72:1A:
6A:3E:60:21:8A:4D:7E:1F:0E:04:07:25:82:6E:95:D6:8E:A8:57:AD:
99:94:0D:38:62:3D:E7:18:BD:EA:4C:72:81:33:A9:BA:5E:A7:0A:D9:
E9:12:4C:9E:7D:73:25:AF:72:C3:5B:2D:B1:19:7B:60:04:44:7B:A1:
37:60:03:6B:4F:CA:35:6E:27:FC:E3:8D:C7:E6:43:A2:7D:DC:1D:BF:
E7:6B:22:23:16:84:37:20:F0:88:64:FE:17:8A:34:5C:BB:12:83:67:
DF:7D:7E:7A:0A:D3:E5:61:C6:2E:11:1D:F1:00:0E:E7:5A:B2:00:01:
73:A9:87:B1:AE:88:C2:2E:28:63:F0:3E:A9:9D:C7:30:1E:B0:BC:05:
C5:31:C2:88:0D:46:5C:78:A7:EA:D2:D3:B0:A0:C0:17:FD:19:EA:BA:
FA:BD:C4:22:25:8C:23:FD:2F:CF:43:59:AB:35:99:B3:49:B7:89:80:
31:15:9C:78:5F:8E:A9:78:18:C2:9C:4D:47:A9:5B:74:B7:F2:35:60:
3E:3C:F5:EF:B6:59:01:C5:F8:CD:24:50:E8:69:1A:D2:59:86:5D:83:
EA:E9:22:78:B6:28:7C:47:FD:3F:C1:50:1E:4B:39:9D:82:F7:6A:57:
3C:F2:36:E4:93:AE:A9:46:41:B4:D2:84:86:ED:8E:8B:03:23:2E:0E:
FC:5C:9E:60:DC:0E:46:EE:54:6F:C6:3D:B0:BB:70:FE:7F:51:63:78:
EE:C2:6C:C5:04:2D:3B:E6:A0:5A:AB:39:F4:69:DB:91:77:89:75:DF:
E5:0C:B3:9C:D3:70:24:0D:49:ED:EF:B9:15:41:F0:A9:8B:4C:A5:B9:
5B:39:14:52:58:D0:F4:E8:5C:3E:2A:A7:37:97:68:EE:1C:CC:CD:16:
75:48:6C:1A:E0:C8:9F:98:80:0E:2A:E8:DA:17:5D:D8:84:53:61:45:
E4:B5:12:53:BF:48:06:20:F7:A3:22:48:84:F7:0B:FF:CD:9E:3D:12:
8B:36:BE:D6:D2:5E:FC:2B:1C:29:AF:9E:B1:98:15:14:B6:D2:9C:56:
C1:51:59:CB:4E:BE:82:F9:59:73:87:63:34:3F:EB:74:BF:C9:43:DC:
94:67:B4:73:1E:3C:17:14:6A:64:6C:F9:CA:87:71:3E:E5:40:73:2F:
CD:2E:60:C1:AE:AE:BC:65:70:D4:E5:0B
aenertia@emiemi:~$ lsmod |grep hid_sen
hid_sensor_als 16384 0
hid_sensor_trigger 20480 1 hid_sensor_als
hid_sensor_iio_common 20480 2 hid_sensor_trigger,hid_sensor_als
industrialio_triggered_buffer 12288 1 hid_sensor_trigger
industrialio 131072 4 industrialio_triggered_buffer,hid_sensor_trigger,kfifo_buf,hid_sensor_als
hid_sensor_hub 32768 3 hid_sensor_trigger,hid_sensor_iio_common,hid_sensor_als
1 Like
Has anyone reliably been able to figure out the case of the disapearing ALS sensor entry?
I’ve never seen it at all on my fw13 7840U ; despite numerous kernels and distro swaps I’ve created a thread/poll here: [POLL/HELP] AMD FW 13 als/Illuminance sensor - present/populated?
If the ALS is the same chip as per the wiki it’s not connected directly via i2c as reports from users with the IIO bus entry don’t show the cm module loaded; I assume this must be something provided by the EC. So am wondering if the 3.03 update broke something?
I have not, but do keep me posted.
So an update - more details in the above thread. But basically ; try wiping the Disk (including the EFI partition) and starting again with a known working distro (Fedora 39 Workstation (Gnome) …
1 Like
As I’ve shared in the other “help/poll” topic that was created, I believe the cm32181, or any other Capella-specific, module should not be required.
The generic hid_sensor_als should be able to pick up the sensor.
I’m leaving this just as a forward ref to the other post with some more details for anyone who may have come here first.
I own a Framework 13 intel 13th gen. The backlight sensor is working correctly and I can adjust the backlight with the brightness keys as well. The module hid_sensor_als is loaded. Fedora 39 kernel 6.6.2-201.fc39.x86_64
The keys and the sensor work nicely together.
custom initramfs
/etc/dracut.conf.d/myflags.conf:
hostonly=“yes”
add_drivers+=" hid_sensor_hub "
omit_dracutmodules+=" network iscsi ifcfg "
I’ve tracked it to a regression introduced in 6.7rc series with the hid_sensor_als init sequence
Specifically, it seems to be caused by commit kernel/git/torvalds/linux.git - Linux kernel source tree with kernel/git/torvalds/linux.git - Linux kernel source tree and kernel/git/torvalds/linux.git - Linux kernel source tree also having to be reverted due to dependency.
I reported the bug upstream: https://bugzilla.kernel.org/show_bug.cgi?id=218223
2 Likes
I’ve just patched my 6.7-rc4 test tree with a revert and will report back.
Also there is an open upstream KDE bugtrack for incorporating iio-sensor-proxy als bits into powerdevil/KCM here:
The revert is now in 6.7-rc7 and works for me.
Many thanks @Steel99xl !
I have an amd laptop 13 running ubuntu 23.10 with gnome DE. Gnome provides a checkbox for “automatic screen brightness” but with no effect at all. This script seems to work quite nicely and adjust screen brightness to adjustable and useful levels (extended testing for different ambient light situations still to come).
However, I had to find out first that
(1) brightnessctl now works only with sudo (this might have changed since previous versions)
(2) SensorToDisplayScale on my amd needs to be about 0.4 which is a decimal number. Hence the calculation of TempLight further down the script needs to be changed to account for the float:
# TempLight=$(($Light * $SensorToDisplayScale))
# now $SensorToDisplayScale is a floating-point number
TempLight=$(echo "scale=2; $Light * $SensorToDisplayScale" | bc)
# rounding to smaller integer
TempLight=$(LANG=C printf "%.0f" $TempLight)With these small changes it appears to work quite nicely!
I would be interested whether I should try to commit this modification to the github repo. I don’t have experience with such system, however …
Many thanks again
Matthias
1 Like
Hi All, I tried to improve on Monster_user’s script (above) by making the ramping super-smooth and integrating support for manually adjusting brightness using the system controls. (the manual adjustment can interfere with the timing of a brightness change, so it may glitch a little). If you decrease brightness to the lowest setting, it resets the adjustment to 0.
I’m really happy with it, and it works about as well as MacOS’s implementation as far as I can tell. It should work on both Intel and AMD Framework laptops, but I haven’t tested it on Intel (feedback welcome). I’ve integrated it with Stike’s systemd service (above).
Let me know if you run into an issue. (to test, run with ‘sudo’)
#
# Bash script to automatically control the backlight brightness using the illumination sensor
# Written because the Gnome 45.4 auto brightness is not smooth unlike my previous MacOS laptop
# which was driving me insane.
#
# Features:
# * smooth, flicker-free ramping
# * sensitivity and delay to prevent constant adjustments
# * manual adjustment though backlight keys or software(*)
# * should work on all Framework 13 AMD and Intel laptops (**)
#
# (*) manual adjustment can be a bit glitchy at times
# (**) Intel has not yet been tested
#
# Michiel Toneman 2024
# Released under the Apache License V2.0
# Define the appropriate devices for Intel and AMD systems
if [ -f /sys/class/backlight/intel_backlight/brightness ]
then
screen_brightness=/sys/class/backlight/intel_backlight/brightness
screen_actual_brightness=/sys/class/backlight/intel_backlight/brightness
screen_max_brightness=/sys/class/backlight/intel_backlight/max_brightness
else
screen_brightness=/sys/class/backlight/amdgpu_bl1/brightness
screen_actual_brightness=/sys/class/backlight/amdgpu_bl1/actual_brightness
screen_max_brightness=/sys/class/backlight/amdgpu_bl1/max_brightness
fi
# Set some constants
max=$(cat $screen_max_brightness)
sensitivity=$((max/10))
min=$((max/10))
delay=5 # Check every 5 seconds
debug=0 # Set to 1 for debug output
# Variables
manual_adjust=0 # Start with manual adjustment set to 0
last_target=$(cat $screen_actual_brightness) # Start the target brightness at the current screen brightness
# Loop
while [ 1 ]
do
doupdate=0
# Get the current state of the backlight and illuminance sensor
sensor=$(cat /sys/bus/iio/devices/iio:device0/in_illuminance_raw)
backlight=$(cat $screen_actual_brightness)
# If the backlight has been manually changed since the last
# change by the script, we take the delta and add it to the manual
# adjustment.
# Reset the manual adjustment by manually dimming to minimum
if [ $((backlight - last_target)) -ne 0 ]
then
if [ $backlight -lt 4 ] # Backlight controls don't appear to go below 2
then
manual_adjust=0
else
manual_adjust=$((manual_adjust + (backlight - last_target)))
last_target=$backlight
fi
fi
# The target brightness is the sensor reading plus the user's (positive or negative) adjustment
target=$(( sensor + manual_adjust ))
# Check if delta between ambient and current backlight exceeds the sensitivity threshold
# so that we don't keep changing brightness all the time
if [ $backlight -gt $target ]
then
if [ $((backlight - target)) -gt $sensitivity ]
then
doupdate=1
fi
fi
if [ $backlight -lt $target ]
then
if [ $((backlight - target)) -lt $sensitivity ]
then
doupdate=1
fi
fi
# Check that we don't exceed the min and max brightness values
if [ $target -gt $max ]
then
target=$max
fi
if [ $target -lt $min ]
then
target=$min
fi
if [ $doupdate -eq 1 ]
then
# Debug logging
if [ $debug -eq 1 ]
then
echo “Starting brightness: $backlight”
echo “Ambient light: $sensor”
echo “Manual adjustment: $manual_adjust”
echo “Adjusted brightness: $target”
echo “-------------------------------”
echo “Sensitivity: $sensitivity”
echo “Min: $min Max: $max”
echo
fi
# Now change the brightness smoothly in single value in/decrements per 20ms
intermediate=$backlight
while [ $intermediate -ne $target ]
do
if [ $intermediate -lt $target ]
then
((intermediate++))
else
((intermediate--))
fi
echo $intermediate > $screen_brightness
sleep 0.02
done
# Remember what the target brightness was
# If the next time round the last target brightness differs from the current backlight value
# then the assumption is that someone has manually adjusted the brightness and we can use that delta
last_target=$target
fi
sleep $delay
done
3 Likes
Work in progress modification of @Michiel_Toneman 's version:
Major Changes:
- Adjusted constants to be more applicable to 13th gen Intel
- Refactored while loop to re-calculate target more often
- Uses exponential ramp (more adjustment early, then slows down as it approaches the target)
- Disabled “manual” adjustment factor calculation
- More debug lines
I am sure this is not at all CPU cycles efficient, and could again be refactored to be more elegant. I am firing the script as a system wide systemd service wanted by multi-user.target, so that it is active at the greeter screen as well.
I will keep testing and update this post / pastebin URL if I make any signifcant changes.
1 Like
I’m thinking about how to get a “manual” correction factor back into the script. Think I’ll change up the loop to be roughly:
- read brightness value from brightnessctl
- compare against what it should be from the last loop adjusted it to
- if different, adjust illumination sensor to target multiplier ratio in the same direction (i.e. if user commanded brighter while loop slept, increase multiplier)
- get current illumination sensor value, compare to last loop’s illumination sensor value
- calculate target, compare to last loop’s target
- adjust towards new target using brightnessctl
- save adjustment step, target, and illumination sensor results
- sleep variable length of time based on how far off illumination, target, or step results are from last loop values (the more any of those change, the sooner we loop)
haven’t clicked into this thread a while, I’ve already written a similar program that does just that:
The repo is kind of bare right now, but it has been functioning quite nicely for me.
I’ll hopefully get around to working on documentation this weekend.
1 Like
First stab at brightnessctl based script + update 1:
UPDATE: Fixed ipeak going negative, substituted “snore” function instead of sleep for better memory / pid consumption.
Its jank and needs a ton of cleanup, but so far it works. I would be happy to have feedback, regarding more elegant ways to do this code (even in other languages), or ways to make it more performant / lower overhead.
Script does everything I explained in last post, but still finding little errors and invalid values that need trapped…
I set it up so that there is a linear increase in brightness with illumination_raw to some peak value, in which case brightness will be full from there on up. Manually adjusting brightness just pulls that peak value up or down to bias the calculation. So it takes more than a few button presses of brightness up or brightness down before the auto adjust loop will settle on the value that you like.
Might want to edit the initial value of the ipeak variable to suit your preferences.
Oh and don’t run two copies of the script at once by accident, as they will fight each other can give weird results!