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@xxxxxxx> Sent: Friday, January 3, 2020 5:16 PM To: Cheng. AJ (TPE) <AJ_Cheng@xxxxxxxxxx> Cc: intel-gfx@xxxxxxxxxxxxxxxxxxxxx; alsa-devel@xxxxxxxxxxxxxxxx; nathan.d.cioba nu@xxxxxxxxxxxxxxx; Wang. CindyXT (TPE) <CindyXT_Wang@xxxxxxxxxx>; Ye. Nelson (T PE) <Nelson_Ye@xxxxxxxxxx>; Yap. Shane (TPE) <Shane_Yap@xxxxxxxxxx>; Kao. Lucien (TPE) <Lucien_Kao@xxxxxxxxxx>; Tseng. Evan (TPE) <Evan_Tseng@xxxxxxxxxx> Subject: Re: 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@xxxxxxxxxx> 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@xxxxxxxxxx<mailto:AJ_Cheng@xxxxxxxxxx> > Tel: +886-2-8797-8599 ext. 17561 > Mobile : +886-932827829 > COMPAL Electronics, Inc. > > [2 flash_once.diff <application/octet-stream (base64)>] > > _______________________________________________ > Alsa-devel mailing list > Alsa-devel@xxxxxxxxxxxxxxxx > https://mailman.alsa-project.org/mailman/listinfo/alsa-devel ======================================================================= ======================================== This message may contain information which is private, privileged or confidential of Compal Electronics, Inc. If you are not the intended recipient of this message, please notify the sender and destroy/delete the message. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon this information, by persons or entities other than the intended recipient is prohibited. ======================================================================= ========================================
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