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There are 2 vendor BIOS's for the Lenovo X200 with the difference being the
settings in the VBT blob to accommodate different backlight frequencies.
Linux however sticks with the setting set by the firmware.
Tested on Lenovo X200 with CCFL backlight.
Change-Id: I4c4a7011ce03cdd511fa2e2160c2f006ba2707ba
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/29904
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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Change-Id: Ia44097f32f74ffd749219415984224ce33d9252b
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/19816
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
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Add some known good values for some thinkpads displays.
Known good means that at this pwm frequency the display is evenly lit
on all duty cycles, the display makes minimal to no noise at lower
duty cycles and the display does not flicker. This values differs from
vendor (which uses an obviously wrong display clock (190MHz instead
of 320MHz) resulting in frequency more than 60% off the intended
value.
TESTED on Thinkpad X200 with edid ascii string in list and removed
from list to see if notice message is shown.
Change-Id: Id7bc0d453fac31e806852206ba2c895720b2c843
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/19500
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
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