Boottime Graphics Resource Table support

modulename: bgrt.ko

and/or

efi-bgrt.ko

configname: CONFIG_ACPI_BGRT

Linux Kernel Configuration
└─>Power management and ACPI options
└─>ACPI (Advanced Configuration and Power Interface) Support
└─>Boottime Graphics Resource Table support
In linux kernel since version 4.2 (release Date: 2015-08-30)  
This driver adds support for exposing the ACPI Boottime Graphics
Resource Table, which allows the operating system to obtain
data from the firmware boot splash. It will appear under
/sys/firmware/acpi/bgrt/ .

source code: