[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 #141 from Stanislav Lisovskiy <stanislav.lisovskiy at intel.com> ---
(In reply to Microtech from comment #140)
> (In reply to Stanislav Lisovskiy from comment #139)
> > Also I found that restarting the device without i915 driver and then loading
> > it manually still works, even without those pins.
> > However if I do suspend even without i915, can't get anything except
> > backlight afterwards. Also if I disable suspend in BIOS it works fine then.
> > 
> > To me it looks like there is something either related to acpi management or
> > panel initialization sequence not mentioned in vbt is missing here.
> 
> We asked to the panel supplier the exact description of DCS Command. I hope
> to reply you soon. However, in your opinion which is the solution?

Well currently one solution is to disable suspend in BIOS and disable access to
the gpio pins 3 and 6. Then at least device is fully usable.. However I guess
we still need to figure out the reason why this is happening.
If everything is correct in panel initialization then most likely this is
related to acpi.
Also it is pretty weird that suspending device even without i915 makes it
unusable for i915 driver afterwards. I would say that there is some issue
related to acpi management or bios.

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