[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 #41 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Karthik B S from comment #40)
> 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. 

We no longer have the tracepoint for most plane register writes. It was
(somewhat unintentionally) removed as part of dd584fc0711a ("drm/i915: Use
I915_READ_FW for plane updates").

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