From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugtrack@alsa-project.org Subject: [ALSA - driver 0000589]: ICH5 S/PDIF audio drops out occasionally Date: Tue, 16 Nov 2004 05:14:28 +0100 Message-ID: <542393b37987ffc6789e2f5d3800f39e@bugtrack.alsa-project.org> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: Received: from bugtrack.alsa-project.org (gate.perex.cz [82.113.61.162]) by alsa.alsa-project.org (ALSA's E-mail Delivery System) with ESMTP id 4BE8822B for ; Tue, 16 Nov 2004 05:14:29 +0100 (MET) Sender: alsa-devel-admin@lists.sourceforge.net Errors-To: alsa-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org A NOTE has been added to this issue. ====================================================================== ====================================================================== Reported By: squarooticus Assigned To: ====================================================================== Project: ALSA - driver Issue ID: 589 Category: PCI - intel8x0 Reproducibility: always Severity: minor Priority: normal Status: new Distribution: Debian Unstable (sid) Kernel Version: 2.6.7 ====================================================================== Date Submitted: 10-21-2004 02:42 CEST Last Modified: 11-16-2004 05:14 CET ====================================================================== Summary: ICH5 S/PDIF audio drops out occasionally Description: I'm using the on-board audio of my Abit IC7-MAX3 ("Intel Corp. 82801EB/ER (ICH5/ICH5R) AC'97 Audio Controller (rev 02)") with ALSA driver snd_intel8x0 for my home theater setup. In every application I've tried, which includes mythtv, xine, and ogg123, through both native alsa and OSS emulation, the audio output from the S/PDIF port drops out for a second every so often---maybe once a minute, or every few minutes; it's not periodic. I don't know whether analog output also drops out, since I don't have analog output hooked up or enabled. This is with the CVS build as of October 19. My asound.conf is: pcm.krose-dmix { type dmix ipc_key 3516 ipc_key_add_uid yes slave { pcm "hw:0,4" period_time 0 period_size 4096 #buffer_size 16384 buffer_size 131072 period_time 84000 buffer_time 340000 rate 48000 channels 2 } bindings.0 0 bindings.1 1 } pcm.dsp0 { type plug slave.pcm "krose-dmix" } ctl.mixer0 { type hw card 0 } pcm.!default { type plug slave.pcm "krose-dmix" } I can't find any options to compile in debug logging: I'm not really sure what the cause of the drop out is, e.g., buffer underrun, PCI contention, etc. I'm happy to spend time to try to debug this, but I need a starting point. Of course, it'd also be great to know if anyone has ever seen this kind of behavior before. I don't believe the SPD/IF port is turning itself off because the receiver doesn't blip, which normally it would if the input were to disappear temporarily. The CPU is a 3.2G P4 with hyperthreading turned on. I never see the CPU usage go above 50%. Interestingly, I see similar behavior on my dual Opteron machine with an AMD-8111 audio controller using the same driver (snd_intel8x0). I never had this problem with the emu10k1 driver when I was using SB Lives, but I have run into PCI slot limitations in my HTPC, so I have to use mobo audio. Suggestions? ====================================================================== ---------------------------------------------------------------------- squarooticus - 11-16-04 02:50 ---------------------------------------------------------------------- Incidentally, I compiled a low-latency kernel (Ingo Molnar's realtime-preempt patches) to see if this would solve the problem, and it doesn't appear to have. It's really unclear what's responsible for this behavior at this point, because I'd figure a low-latency kernel would at least make the problem much less likely were buffer underrun really the issue. I'd really like to be able to determine for sure whether underrun has occurred or not. ---------------------------------------------------------------------- squarooticus - 11-16-04 05:14 ---------------------------------------------------------------------- More info: this problem occurs with another digital receiver, so the problem is either with (a) the software, (b) the mobo hardware, or (c) the cable. I will try to eliminate (c) this week. :) FWIW, the drop-out is much shorter on this receiver (Yamaha HTR-5650) than on the original one (Marantz SR-7000). It's unclear to me whether this means the S/PDIF signal is being interrupted, or if an underrun of the AC3 data is enough to cause this effect. Issue History Date Modified Username Field Change ====================================================================== 10-21-04 02:42 squarooticus New Issue 10-21-04 02:42 squarooticus Distribution => Debian Unstable (sid) 10-21-04 02:42 squarooticus Kernel Version => 2.6.7 10-21-04 23:40 squarooticus Issue Monitored: squarooticus 10-27-04 16:54 squarooticus Note Added: 0002275 11-10-04 12:26 tiwai Note Added: 0002367 11-12-04 06:23 squarooticus Note Added: 0002392 11-15-04 20:24 squarooticus Note Added: 0002419 11-16-04 02:50 squarooticus Note Added: 0002423 11-16-04 05:14 squarooticus Note Added: 0002424 ====================================================================== ------------------------------------------------------- This SF.Net email is sponsored by: InterSystems CACHE FREE OODBMS DOWNLOAD - A multidimensional database that combines robust object and relational technologies, making it a perfect match for Java, C++,COM, XML, ODBC and JDBC. www.intersystems.com/match8