[Bug 108462] New: 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

            Bug ID: 108462
           Summary: two external screens permanently go blank on HP
                    EliteBook Folio G1
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Keywords: regression
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: johannes at sipsolutions.net
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

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.

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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