please remove acpi_backlight=vender boot option and then: 1. attach the output of "grep . /sys/class/backlight/*/*" 2. attach the output of "cat /sys/class/backlight/acpi_video*/device/path".
does poking these I/F changes the backlight?
please remove acpi_backlight= vender boot option and then: backlight/ */*" backlight/ acpi_video* /device/ path".
1. attach the output of "grep . /sys/class/
2. attach the output of "cat /sys/class/
does poking these I/F changes the backlight?