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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #12 from wendy.wang at intel.com ---
(In reply to wendy.wang from comment #11)
> (In reply to Ville Syrjala from comment #10)
> > Created attachment 107624 [details] [review] [review]
> > [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.
> 
> This patch can fix the edp not light problem with R10 rework on BSW. Pls
> help upstream the patch, thanks.
> 
> Detail configuration:
> BSW RVP FAB2 with R9,R10,R11 rework
> B1 CPU silicon
> KSC is 1.02
> BIOS: V36
> RAM: 2x 2GB
> OS: Ubuntu 14.04 x64

Patch apply against latest drm-intel-nightly branch kernel.

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