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The vbt was extracted from the option rom found on stock images.
The vbt.bin is the same across all variants.
The VBT has a modified BDB block 43, the 'Backlight info block' such
that the inverter type for the panel in use is set to
2 (BDB_BACKLIGHT_TYPE_PWM) instead of 0 (BDB_BACKLIGHT_TYPE_NONE).
This only seems to matter on Windows, as without it changing the
backlight duty cycle does not work.
Change-Id: I82c72c561e1058e0b77d80baf330b64f7c6b08e3
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/30487
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-by: Tristan Corrick <tristan@corrick.kiwi>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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