[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 #30 from Imre Deak <imre.deak at intel.com> ---
(In reply to Humberto Israel Perez Rodriguez from comment #28)
> (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

Well, in comment#23 you said:
"the DUT is not able to resume from S3 if is connected any external display (DP
/ HDMI)"

This means to me that not only that HDMI is not detected after S3 resume, but
S3 doesn't work at all, that is the machine hangs or similar generic issue.
Could you clarify what did you mean in comment#23? That is does S3 work at all
for you with current -nightly (is the system still alive, can you SSH in)? With
the above branch do you have working eDP/DP after S3 suspend/resume?

Not detecting HDMI after S3 is expected. The HDMI port is routed through the
LSPCON protocol converter and the driver doesn't have support for that (patches
are under review). Since BIOS configures LSPCON you will have a working output
right after booting, but that configuration will be lost after S3
suspend/resume.

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