[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 #150 from Microtech <fabio.rifici at microtechsrl.com> ---
(In reply to Stanislav Lisovskiy from comment #141)
> (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.

Hi Stanislav, thanks for your efforts. 
I remember you that under Windows everything works perfectly. If the problem is
BIOS or Acpi management inside the BIOS, then Windows 10 shouldn't work.
Maybe you have some other solution?
At the end you have the best document ever in your hands : the tablet!

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