[Bug 108826] [GLK DSI] Black screen after grub - Ubuntu 18.04 - kernel latest tip 21.11.2018

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108826

--- Comment #151 from Stanislav Lisovskiy <stanislav.lisovskiy at intel.com> ---
Hi,

Sorry for a long reply. I'm currently on vacation. Yes it works on Windows, I
checked with codebase to which I have access and DSI/VBT code looks pretty much
same. However I'm still not able to compare with their GPIO and ACPI code. It
looks like we are lacking initialization of something or may be GPIO mapping is
not completely correct. However I checked with our pinctrl developer person and
from his point of view everything looks correct.
I have found that there are other controlable pins which affect DSI display,
not mentioned in VBT or manual, which makes me believe there is something else
we need to make it work. Unfortunately without exact pin description and
initialization sequences any hardware is a "blackbox". That is why I asked for
more detailed init description from panel vendor. I guess they should have it
anyway for panel testing purposes. I will be back on 17th and start working on
it immediately.

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