[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 #117 from Stanislav Lisovskiy <stanislav.lisovskiy at intel.com> ---
I have checked the vbt sequences, pll settings, clocks and i915 seems to follow
those properly(I have added a lot of debugs to verify this). 
However the problem is that whenever it touches gpios related to power and
reset(GPIO index 3, 6) the screen gets corrupt(there is some picture it is
actually not fully black), even though we seem to do everything according to
vbt, which means that now we have to compare with Windows driver(which I don't
have access to right now) and also get some schematics to understand what
exactly is wrong with those.
If we are not touching those faulty two pins - the screen is fine(which
probably means that the rest of init sequence is correct), however
suspend/resume doesn't work, I guess because without those pins, we don't have
a way to properly power_on/reset the panel.

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