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

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Message-ID: <3c938f3f-fa1f-b08a-5ca5-b2044ed6fb4c@synopsys.com>
Date:   Mon, 4 Dec 2017 10:04:31 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Nick Bowler <nbowler@...conx.ca>,
        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 03-12-2017 05:20, Nick Bowler wrote:
>
> Your patch changes things.  With this applied on top of 4.15-rc1
> it is failing 100% of the time instead of only half of the time.

Ok, it was a long shot anyway.

>
> 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?

> 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).

>
> Thanks,
>   Nick