[Bug 90320] Lenovo ThinkPad E455 (Kaveri A10-7300): Blank built-in screen with radeon kms driver

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Comment # 19 on bug 90320 from
Certain panels can be really picky about sequencing or delays in the link
training.  I suspect there are mainly just slight differences in the
programming sequences that some panels just don't like.  The core link training
code for DAL is here:
https://cgit.freedesktop.org/~agd5f/linux/tree/drivers/gpu/drm/amd/dal/dc/core/dc_link_dp.c?h=amd-staging-4.7


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