[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 #158 from Stanislav Lisovskiy <stanislav.lisovskiy at intel.com> ---
(In reply to Microtech from comment #157)
> (In reply to Stanislav Lisovskiy from comment #151)
> > 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.
> 
> Hi Stanislav, any news for us?

Hi, unfortunately I had to do other things for last 2 weeks, however I will get
back to this asap.

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