Display brightness control

Help
, ,
1

Asus Rog Flow X13 GV301RE laptop
Debian 12
KDE 5.27.5
Kernel 6.1.0-33-amd64 (64-bit)
Graphics: Wayland
Recently, the display brightness adjustment using the sliders in the interface and the buttons on the keyboard stopped working, but the adjustment animation is present (honestly, the display brightness adjustment worked immediately after installation). The keyboard backlight is adjusted as usual.
I dug around on the Internet and found an option to adjust via the command line with a utility:

root@ROG:/home/mohn# brightnessctl
Device 'amdgpu_bl1' of class 'backlight':
Current brightness: 0 (0%)
Max brightness: 255

Then I dug up how to set the brightness without this utility:
echo 0 > /sys/class/backlight/amdgpu_bl1/brightness
the command above sets the minimum brightness, if you replace 0 with 255, you can set the maximum.
Now the task: how to fix brightness adjustment with sliders in the KDE interface and keyboard buttons?

2

from my notes about the brightness control

# to keep brightness levels from changing, disable brightness control slider in system tray
systemctl --user edit plasma-powerdevil.service
# add these two lines to the file that opens
[Service]
Environment=POWERDEVIL_NO_DDCUTIL=1
# save and logout
# to reverse, just delete the directory created at
~/.config/systemd/user/plasma-powerdevil.service.d
# add this package for stand alone GUI control of monitor settings
gddccontrol
3

My display is not supported.

4

Fixed!

Edit Grub:
$ sudo nano /etc/default/grub

Find:
GRUB_CMDLINE_LINUX_DEFAULT="quiet"

Edit:
GRUB_CMDLINE_LINUX_DEFAULT="quiet acpi_backlight=native"

Ctrl + O (Write)
Ctrl + X (Exit)

Update grub:
$ sudo update-grub

Reboot system:
$ sudo reboot

How edit for backlight
With acpi_backlight=native, only amdgpu_bl0 appears
With acpi_backlight=video, only acpi_video0 appears
With acpi_backlight=vendor, no backlight controls are present at all.