[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 #40 from Karthik B S <karthik.b.s at intel.com> ---
I went through both the logs and checked the DDB /watermark register write's.
They look fine, although I see the WM registers only for Pipe A.
Somehow it seems like many reg read/write's are missing.
Also I don't see any read/write of the Plane control registers and without that
it would not be possible to verify the correctness of DDB allocation. 

I would need to bug you for more logs again and this would be never ending,
instead I think it would be better if I'm able to reproduce the issue locally.
So we'll give one last try for the same.

Firstly it would be good for me if it would be possible to reproduce to the
issue on DRM-TIP. And also please share the config file you used with the
kernel together with the resolutions of both the displays.
And I believe the issue is only reproduced on the display config mentioned by
you right?
    * one directly by USB-C display port cable
    * one via docking station connected with HDMI

Hopefully I'm able to reproduce the issue locally time time and then root cause
the issue asap.

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