[Bug 94439] [BXT-P/APL] DP and HDMI will stop output after resumed from S3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94439

--- Comment #28 from Humberto Israel Perez Rodriguez <humberto.i.perez.rodriguez at intel.com> ---
(In reply to Imre Deak from comment #27)
> I believe that S3 failing in itself (so not the hotplug issue originally
> reported) is not a BIOS issue. I could reproduce it on my machine with a
> recent BIOS:
> APLKRVPA.X64.0130.B11.1603210634
> 
> With a few fixes S3 works now for me and those fixes could be also relevant
> here.
> So Humberto, besides trying to upgrade the BIOS as Yann suggested could you
> also try the following branch:
> https://github.com/ideak/linux/commits/bxt-rpm

Hi Imre Deak :

i tried with a newer bios 131.10 and the branch :
https://github.com/ideak/linux/commits/bxt-rpm, but is the same issue, after
return from S3 the HDMI is not seen and xrandr also does not recognize it

kernel info
==================
commit 068ab4d97212c00defebf525821001785c7caf2e
Author: Imre Deak <imre.deak at intel.com>
Date:   Fri Apr 8 20:40:16 2016 +0300

    drm/i915/bxt: Sanitize DC state tracking after suspend-to-ram and -disk

    After suspend-to-ram or -disk we don't know what power state the display
    is, DC0 or DC9 are both possible states, so reset the DC software tracking
    in these cases. This gets rid of 'DC state mismatch' error messages
    during suspend to ram and disk which is a false positive based on the
    above.

    Signed-off-by: Imre Deak <imre.deak at intel.com>

branch = bxt-rmp
kernel = 4.6.0-rc2

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