For those who is coming there from the Internet, these dGPU patches help to resolve the following problem observed while running Linux on G505S with coreboot BIOS installed:

 [    Time_1] [drm:radeon_get_bios [radeon]] *ERROR* ACPI VFCT image header truncated
 [    Time_2] radeon 0000:01:00.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0x0000
 [    Time_3] radeon 0000:01:00.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0x0000
 [    Time_4] [drm:radeon_get_bios [radeon]] *ERROR* Unable to locate a BIOS ROM
 [    Time_5] radeon 0000:01:00.0: Fatal error during GPU init
 [    Time_6] [drm] radeon: finishing device.

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