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The current BIOS-extracted VBT breaks backlight control
with Tianocore, so replace it with one that does. Settings
were exported using Intel BMP tool and the overlayed onto
a GOP-format (vs BIOS format) VBT file.
Test: boot google/wolf with both SeaBIOS and Tianocore payloads,
verify backlight control functional under both Linux and Windows.
Change-Id: Id6281c8dfb6e0001be8c4d9be1013f2d4bbb5880
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38397
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
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Update VBT using file extracted from VGA BIOS from stock
firmware image using intelvbttool, zero-padded to 0x11ff
bytes to make the Intel BMP editor happy.
Change-Id: I9f53e80305ec8de78a3d5c930224b394b5c8618a
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37732
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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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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