[Intel-gfx] [PATCH 5/5] drm/i915/opregion: let user specify override VBT via firmware load

[Chris Wilson]

On Tue, Feb 21, 2017 at 06:40:25PM +0200, Jani Nikula wrote:
> Sometimes it would be most enlightening to debug systems by replacing
> the VBT to be used. For example, in the referenced bug the BIOS provides
> different VBT depending on the boot mode (UEFI vs. legacy). It would be
> interesting to try the failing boot mode with the VBT from the working
> boot, and see if that makes a difference.
> 
> Add a module parameter to load the VBT using the firmware loader, not
> unlike the EDID firmware mechanism.

What's the mechanism by which they would create a valid VBT file?
Does
	cat /sys/kernel/debug/dri/0/i915_opregion > vbt.fw
work and provide a starting point for corrections?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre