since the update from 13.07.2021 (I guess), the brightness for my laptop screen cant’be changed:
- Using FN-F5 / F6 the onscreen slider (ref. screenshot)
shows up and I can the values between 0% and 13%; higher values are not possible, the brightness does not change.
- Using SystemSettings > Hardware > Energy > EnergySavings, I can change the values for “powered”, “onBattery” and “onBattery, while low” between 0 and 100% but the brightness does not change…
I found something similar here and there, but I don’t see the solution or my knowledge is to poor, to follow.
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
eDP connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 309mm x 173mm
HDMI-A-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
In addition to the above I found, that also the LED in the F4-key, indicating the microphone-muting, does not work. Pressing FN-F4 mutes / unmutes the microphone, the LED is always OFF.
I tried running other Operating Systems, even an older MANJARO-version: Both issues (screen brightness and F4-LED) only occur with the actual Manjaro.
Definetely, I need help with this!
My apologies for the noise, it has been my fault: In order to prevent from the message
$ systemctl --failed
I added for a LENOVO T14s (AMD, 1st. Gen) based on Arch-Wiki that parameter “acpi_backlight=vendor” into /etc/default/grub:
GRUB_CMDLINE_LINUX_DEFAULT="text apparmor=1 security=apparmor ... udev.log_priority=3 noplymouth **acpi_backlight=vendor**"
This causes the issue; I removed it, brightness changes are possible now!
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