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

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Message-ID: <20171205061858.6jdegc3yrbrii7b5@aura.draconx.ca>
Date:   Tue, 5 Dec 2017 01:18:58 -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 13:33 -0500, Nick Bowler wrote:
> On 2017-12-04 10:04 +0000, Jose Abreu wrote:
> > 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.

Using the above sequence on unpatched 4.15-rc1 it seems there is no
sound when starting audio output after the pink bar is visible.

However I am not confident of the results here, restarting aplay
with different sample rates (or even restarting with the same rate)
is causing some weird effects on my setup so I want to check the test
setup with some different source devices.

Cheers,
  Nick