linux-kernel - Re: PROBLEM: Asus C201 video mode problems on HDMI hotplug (regression)

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Message-ID: <CADyTPExkp2s24hrpYhuT6r8LpECaPHD6G2Acqw2vXonawAKMWA@mail.gmail.com>
Date:   Mon, 4 Dec 2017 13:33:52 -0500
From:   Nick Bowler <nbowler@...conx.ca>
To:     Jose Abreu <Jose.Abreu@...opsys.com>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Dave Airlie <airlied@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: PROBLEM: Asus C201 video mode problems on HDMI hotplug
 (regression)

On 2017-12-04 10:04 +0000, Jose Abreu wrote:
> On 03-12-2017 05:20, Nick Bowler wrote:
> > I brought the original test equipment back to the setup so I can
> > see the video and pink bar again.  The symptoms remain the same
> > (unexpected size, pink bar, and no audio).
> >
>
> Can you tell me which test equipment are you using?

I am using an XRGB-Mini Framemeister as the sink device for testing
which isn't "real" test equipment but does show details of the video
and audio mode (which the monitor I have does not do).

The normal setup of this laptop has a small "audio splitter" as
the sink, which among other things includes HDMI input and output
ports and an S/PDIF audio output.

These devices can be connected together in various ways and the
results seem to be consistent in any configuration.

> > It is very consistent: pink bar <=> no audio.
> >
> > My suspicion is that the audio problem is just the wrong video mode
> > on the sink side messing things up, but I have no way of confirming
> > that (that I know of).
>
> Hmmm, my first thought was that audio is being configured first
> because of the phy lock wait time, I've seen this happening before.
>
> Lets try this:
> - Disable all alsa clients (e.g. pulseaudio, ...) so that no one
> tries to configure audio.
> - Plug out/in the cable until the issue appears
> - When the issue appears use aplay to play audio through the HDMI
> output
> - Repeat several times with different audio rates and with no
> resample (you can use the plughw interface in aplay).

OK, I will give it a try later this evening.

Cheers,
  Nick