Hi Vesa
Could you help me to identify issue by set acpi_backlight to native?
please run commands below and see if issue still there
```
sudo sed -i
's/GRUB_CMDLINE_LINUX_DEFAULT="/GRUB_CMDLINE_LINUX_DEFAULT="acpi_backlight=native
/' /etc/default/grub
sudo update-grub
sudo reboot
```
you can recover by commands
```
sudo sed -i 's/ acpi_backlight=native//' /etc/default/grub
sudo update-grub
sudo reboot
```
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https://bugs.launchpad.net/bugs/2155617
Title:
Backlight device disappears and brightness breaks on kernel 6.17.0-23+
(Lenovo Legion 5 Pro, NVIDIA hybrid graphics)
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