[Bug 101205] [i915][BYT] Blank screen on MIPI panel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101205

--- Comment #8 from Innocent Bystander <dimitry at cos.flag.org> ---
(In reply to Innocent Bystander from comment #7)
> Sprinkled a few more printks here and there. Discovered an interesting thing
> in the function `find_section()` here:
> 
> http://elixir.free-electrons.com/linux/v4.6/source/drivers/gpu/drm/i915/
> intel_bios.c#L78
> 
> The faulty unit (X8S) reports section 53 (BDB_MIPI_SEQUENCE) at offset 4650
> with length of 7! Whereas the good unit (X8) reports the same offset, but
> the length of 1355. All other sections are identical.
> 
> Sounds like a firmware bug?...

Actually not necessarily. It seems it's simply missing from the VBT.

How does Windows figure out how to deal with the panel then? Is there a
fallback sequences that can be used?

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