Hi Takashi
We verified on Ubuntu 19.10 with kernel 5.4.0.0-050400-generic (please refer to attachment), the result is positive which symptom doesn't happen anymore once I played music or video sound output through Dell S2718D Type-C monitor. It seems had some fix in latest kernel.
Thanks.
-----Original Message----- From: Takashi Iwai tiwai@suse.de Sent: Friday, January 3, 2020 5:16 PM To: Cheng. AJ (TPE) AJ_Cheng@compal.com Cc: intel-gfx@lists.freedesktop.org; alsa-devel@alsa-project.org; nathan.d.cioba nu@linux.intel.com; Wang. CindyXT (TPE) CindyXT_Wang@compal.com; Ye. Nelson (T PE) Nelson_Ye@compal.com; Yap. Shane (TPE) Shane_Yap@compal.com; Kao. Lucien (TPE) Lucien_Kao@compal.com; Tseng. Evan (TPE) Evan_Tseng@compal.com Subject: Re: [alsa-devel] USB Type-C monitor flashes once when play a video file after unplug and re-plug the monitor
On Fri, 03 Jan 2020 02:57:03 +0100, AJ_Cheng@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 lea st 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 reall y mandatory. I'm wondering whether the recent write-sync change improves the si tuation, so let's check the recent code.
thanks,
Takashi
AJ Cheng NID/NID1 e-mail: AJ_Cheng@compal.commailto:AJ_Cheng@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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