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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #18 from Jani Nikula <jani.nikula at intel.com> ---
The VBT for the non-working Pipo X8S does not seem to have any real contents in
the MIPI DSI sequence block, which is surprising. I can think of two scenarios
here:

1) You've changed the boot mode when installing. It's surprisingly common that
the VBT is different for UEFI vs. legacy boot. Though this is usually more of
an issue on Windows based machines, not sure about Android. (But I guess this
is originally dual boot?)

2) The vendor failed to make the panel work using the VBT sequences, and opted
to hack it all in the driver. It's usual that the vendor kernels have quite a
bit of delta from upstream. You could try to find the sources for the kernels
used in both devices, and compare.

In any case effectively reverse engineering this kind of non-standard,
typically one-off products is not a priority in the upstream driver. If it
works, great. If you figure out how to make it work, and contribute upstream,
great. But we won't go out of our way to fix this.

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