[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 #149 from Stanislav Lisovskiy <stanislav.lisovskiy at intel.com> ---
(In reply to Mark Wynn Garcia from comment #147)
> Hmmm, so GPIOs 144-145 is for panel 1 (i.e. PNL1_VDDEN,PNL1_BKLTEN) while
> 128-129 is for panel 0 (i.e. PNL0_VDDEN,PNL0_BKLTEN). Don't know why we're
> using panel 1...

As I understand Panel 0 is reserved for eDP just as correspondent GPIOs and
panel 1 is for DSI. This is visible from DSN schematics file. Some of the
signal lines are shared though, there could be an issue with that however I
don't see anything suspicious so far.

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