FM / bgrt

/sys/firmware/acpi/bgrt

Name	Size	Mode	Actions
image	33694	0444	edit dl rm
status	4096	0444	edit dl rm
type	4096	0444	edit dl rm
version	4096	0444	edit dl rm
xoffset	4096	0444	edit dl rm
yoffset	4096	0444	edit dl rm

Edit: /sys/firmware/acpi/bgrt/status (4096B)