No change when using kernel parameter acpi_backlight=vendor
vendorbacklight: intel_backlight
No change in brightness for echo 8 > /sys/class/backlight/intel_backlight/brightness
No change when using kernel parameter acpi_backlight= vendor
vendorbacklight:
intel_backlight
No change in brightness for backlight/ intel_backlight /brightness
echo 8 > /sys/class/