<pre> Hi Takashi Is the attachment what you suspect? That merged to our kernel v4.19 already, have any suggestions? Thanks. -----Original Message----- From: Takashi Iwai <tiwai@suse.de> Sent: Wednesday, January 8, 2020 2:57 AM To: Nathan Ciobanu <nathan.d.ciobanu@linux.intel.com> Cc: Kao. Lucien (TPE) <Lucien_Kao@compal.com>; Cheng. AJ (TPE) <AJ_Cheng@compal.com>; intel-gfx@lists.freedesktop.org; alsa-devel@alsa-project.org; Wang. CindyXT (TPE) <CindyXT_Wang@compal.com>; Ye. Nelson (TPE) <Nelson_Ye@compal.com>; Yap. Shane (TPE) <Shane_Yap@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 Tue, 07 Jan 2020 18:24:57 +0100, Nathan Ciobanu wrote: > > On Mon, Jan 06, 2020 at 08:08:04AM +0000, Lucien_Kao@compal.com wrote: > > 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. > > Takashi, can you point to the patch series you suspect may have fixed this issue? The first suspect would be 2756d9143aa517b97961e85412882b8ce31371a6 ALSA: hda - Fix intermittent CORB/RIRB stall on Intel chips Takashi > > Thanks, > Nathan > > > > 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.ciobanu@linux.intel.com; Wang. CindyXT (TPE) > > <CindyXT_Wang@compal.com>; Ye. Nelson (TPE) <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 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@compal.com<mailto: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)>] > > > > > > _______________________________________________ > > > Alsa-devel mailing list > > > Alsa-devel@alsa-project.org > > > https://mailman.alsa-project.org/mailman/listinfo/alsa-devel > > </pre>=============================================================================================================== 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. ===============================================================================================================