[Bug 84265] [BSW Bisected]System fails to find eDP monitor.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84265

Ville Syrjala <ville.syrjala at linux.intel.com> changed:

           What    |Removed                     |Added
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           Assignee|intel-gfx-bugs at lists.freede |ville.syrjala at linux.intel.c
                   |sktop.org                   |om

--- Comment #10 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
Created attachment 107624
  --> https://bugs.freedesktop.org/attachment.cgi?id=107624&action=edit
[PATCH] drm/i915: Don't trust the DP_DETECT bit for eDP ports on CHV

Ok, so it seems the DDC pins are muxed in such a way on these boards that
there's no DDC pins for port C, and thus no strap for the port detect.

I have no idea how it manages to work for some people (including me), but maybe
the straps are sampled before the pin muxing is changed or something. Although
even that is a very weak theory since the default muxing seems to be such that
there's no DDC for port C. So I can't actually explain how the detect bit ends
up as 1 on my machine.

Anyway this patch will check the VBT to see if there should be an eDP port
there even if the strap said otherwise. We anyway rely on the VBT to tell DP
and eDP apart so this doesn't actually increase our dependence on the VBT.

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