[Bug 94338] Kernel DRM/i915 init sends eDP panel into self-test loop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94338

--- Comment #16 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Ville Syrjala from comment #13)
> OK. So now the question becomes is the EDID failure expected, and if so how
> are we actually supposed to fine the timings for the panel in the VBT. At
> least the panel type in block 40 seems bogus.
> 
> The spec says:
> 
> "Panel Type
> This field specifies the LFP panel index for the LFP panel present in the
> platform.
> Note: This field is deprecated and to be obsoleted. It is recommended to use
> the Panel Type from the Display Device data structure of the corresponding
> LFP display."
> 
> but there is no panel type in the aforementioned structure in block 2.
> 
> Jani, did we ever find out what this note really means?

Just to answer myself here, I found something nice in Opregion that might help.
If there's a chance of retesting with this particular machine, I'd rather like
to know the results with this included:

commit a05628195a0d9f3173dd9aa76f482aef692e46ee
Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
Date:   Mon Apr 11 10:23:51 2016 +0300

    drm/i915: Get panel_type from OpRegion panel details

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