[alsa-devel] USB Type-C monitor flashes once when play a video file after unplug and re-plug the monitor

[Takashi Iwai]

On Fri, 03 Jan 2020 02:57:03 +0100,
<AJ_Cheng at compal.com> wrote:
> 
> Hi Sirs,
>         Here is chromebook SW team from Compal.
> As the mail title, we hit issue that the external monitor will flash once when play video after hot pluging.
> We can reproduce not only on chromebook but also ubuntu 16.04.
> There has higher failure rate with Dell Solomon dock and Dell S2718D monitor.
> 
> We found adding the delay in "sound/pci/hda/patch_hdmi.c " can fix this issue.(as the attachment)
> May need your help to review and advice. Thanks.
> 
> Here is the issue number in gitlab for more detail.
> https://gitlab.freedesktop.org/drm/intel/issues/318

Could you check whether it still happens with the latest upstream
kernel, at least 5.4.y, if it wasn't tested yet?

I don't want to put a long delay just because of random reason unless
it's really mandatory.  I'm wondering whether the recent write-sync
change improves the situation, so let's check the recent code.


thanks,

Takashi

> 
> 
> 
> AJ Cheng
> NID/NID1
> e-mail: AJ_Cheng at compal.com<mailto:AJ_Cheng at compal.com>
> Tel:  +886-2-8797-8599 ext. 17561
> Mobile : +886-932827829
> COMPAL Electronics, Inc.
> 
> [2 flash_once.diff <application/octet-stream (base64)>]
> 
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