Регулировка яркости на HP 250 G8

$ inxi -SM
System:
  Host: hp250 Kernel: 6.5.0-21-generic arch: x86_64 bits: 64 Console: pty pts/6 Distro: Ubuntu
    23.10 (Mantic Minotaur)
Machine:
  Type: Laptop System: HP product: HP 250 G8 Notebook PC v: Type1ProductConfigId
    serial: CND2411DRA
  Mobo: HP model: 881D v: 50.34 serial: PKWRQC32VFD88J UEFI: Insyde v: F.63 date: 08/24/2023

$  DISPLAY=:0 xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1920 x 1080, current 1920 x 1080, maximum 1920 x 1080
default connected primary 1920x1080+0+0 0mm x 0mm
   1920x1080     77.00* 


$ ls -al /sys/class/backlight/
total 0
drwxr-xr-x  2 root root 0 мар  6 11:35 .
drwxr-xr-x 82 root root 0 мар  6 11:35 ..

$ cat /proc/cmdline 
BOOT_IMAGE=/@/boot/vmlinuz-6.5.0-21-generic root=UUID=931e0f33-203e-41b8-bed8-ff9d1960619e ro rootflags=subvol=@ acpi_osi=linux acpi_backlight=video nomodeset noresume no_console_suspend ignore_loglevel mitigations=off split_lock_detect=off ipv6.disable=1

# dmesg|grep -i added
[    0.098411] ACPI: Added _OSI(Module Device)
[    0.098411] ACPI: Added _OSI(Processor Device)
[    0.098411] ACPI: Added _OSI(3.0 _SCP Extensions)
[    0.098411] ACPI: Added _OSI(Processor Aggregator Device)
[    0.098411] ACPI: Added _OSI(linux)
[    0.271261] pci 0000:00:02.0: vgaarb: VGA device added: decodes=io+mem,owns=io+mem,locks=none