[Bug 108462] two external screens permanently go blank on HP EliteBook Folio G1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108462

--- Comment #7 from Lakshmi <lakshminarayana.vudum at intel.com> ---
(In reply to Johannes Berg from comment #0)
> DRM tip tree, commit 90b59df999a1 ("drm-tip: 2018y-10m-15d-20h-57m-27s UTC
> integration manifest")
> 
> Fedora 28 system on an HP EliteBook Folio G1 with Intel(R) Core(TM) m7-6Y75
> CPU, x86_64 of course.
> 
> I have two external monitors connected:
>  * one directly by USB-C display port cable
>  * one via docking station (https://www.iogear.com/product/GUD3C01/),
> connected with HDMI
> 
> Both screens frequently go completely blank. Of course now while I was
> waiting for it with the camera turned on it didn't happen, but basically it
> just all goes completely black and the displays turn off the backlight
> temporarily.

How the screen comes back? Any particular actions will make the screen turn on
again?

> This is a regression, but I cannot exactly say when it was introduced. I
> know it works on 4.13 (which I installed because of this bug...), and I
> believe it still worked on 4.15, but I don't have that installed now to test.

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