A NOTE has been added to this issue. ====================================================================== <https://bugtrack.alsa-project.org/alsa-bug/view.php?id=862> ====================================================================== Reported By: Will Assigned To: jcdutton ====================================================================== Project: ALSA - driver Issue ID: 862 Category: PCI - emu10k1 Reproducibility: always Severity: major Priority: normal Status: assigned Distribution: Kernel Version: 2.6.10 ====================================================================== Date Submitted: 01-30-2005 15:24 CET Last Modified: 07-19-2006 01:30 CEST ====================================================================== Summary: emu10k1 always has random clicks in wavetable MIDI synth playback but never in PCM playback Description: An Audigy 2 LS 5.1 PCI soundcard with emu10k1 chipset (the PCI id is 1102:0004 (rev 04)) always has random clicks in wavetable MIDI synth playback but never in PCM playback using any version of alsa-driver. I think this clicking is probably an emu10k1 driver bug. It makes no difference which driver or kernel is used; the problem exists with alsa-driver-CVS, alsa-driver-1.0.8, and all previous versions since before alsa-driver-0.9.7 and with all mainline kernel versions of Linux 2.4.x and Linux 2.6.x including 2.6.10. It makes no difference which kernel is used (2.4.x or 2.6.x). I recently started using CONFIG_ACPI_* with CONFIG_PCI_[GO]BIOS in 2.6.10 but it makes no difference. I use the default PCI latencies. It makes no difference whether or not the emu10k1 IRQ is shared and the clicking is exactly the same regardless of which other device shares the IRQ, e.g. "IRQ 17: 78129 IO-APIC-level libata, EMU10K1" or "IRQ 16: 9554 IO-APIC-level eth0, EMU10K1". From: Lee Revell <rlrevell AT ...> Subject: Re: [PATCH] emu10k1 multichannel support Date: Sat, 29 Jan 2005 16:28:47 -0500 To: William <walsac3 AT ...> Message-Id: <1107034127.24676.55.camel@xxxxxxxxxxxxxxxx> Content-Type: text/plain (sorry for the late reply) On Wed, 2005-01-19 at 19:16 +0000, William wrote: > > I'll mention the following in case you might be interested to look at it. > An issue that's been around since the very beginning of the emu10k1 driver > is that playing a MIDI file on the wavetable often produces a > rapid but irregular sequence of very noticeable clicks at a > rate of 2 or 3 per second continuing for up to about 10 seconds. > The clicking starts happening once every minute or so but without any > clear pattern - it doesn't seem to be depend much on the contents of the MIDI > files. > > Interestingly I never hear any clicks when using the PCM and > a soft synth like fluidsynth or timidity as an alternative method > of MIDI playback, which is why I think it might be a bug (haven't checked > whether something similar has already been logged on the bugtracker). > I had a brief look into it, but didn't find anything conclusive in the code. > One possibly interesting feature was I notice that I could trigger lots of > clicks if I tried doing real-time variable attenuation of already playing > notes via update_voice(vp, SNDRV_EMUX_UPDATE_VOLUME) in emu10k1_callback.c I would actually be interested in looking at this. I have noticed some areas in the code where things are commented out for odd reasons. Specifically the samples cache is not cleared like it is for PCM voices. If you have time please file an ALSA bug report (you can just copy and paste this message). > By the way, do you know the original purpose of snd_emu10k1_sum_vol_attn() > in emu10k1/io.c which has just been removed in alsa-driver-1.0.8? > The cumulative volume conversion algorithm in that function > seems like it would probably have been based on the original emu10k1 chipset > documentation provided by Creative during its open-source era. > It seems like a useful function to keep around for future extensions of > the emu10k1 driver. Maybe it should be re-instated. > > >From the 1.0.8 announcement: > > - Summary: ALSA PCI drivers: misc cleanups > The patch below does the following cleanups under sound/pci/ : > - remove the following unused global functions: > - emu10k1/io.c: snd_emu10k1_sum_vol_attn > Yes, I asked Takashi about this and he said it just does some simple calculation. Check the alsa-devel archive. But, maybe there's something to it. It could be related to your clicking problem. I have heard something similar when using PCM at really low latencies. Lee ====================================================================== ---------------------------------------------------------------------- Will - 03-16-06 11:56 ---------------------------------------------------------------------- It seems the problem may still exist. I'll need to do more detailed tests to confirm this, but will not have access in the next month or so. ---------------------------------------------------------------------- agoode - 07-19-06 01:30 ---------------------------------------------------------------------- I no longer have the problem with this configuration: FC5 x86_64 2.6.17-1.2157_FC5 Creative Labs SB Audigy (rev 04) This is the same hardware as in my previous comment. Issue History Date Modified Username Field Change ====================================================================== 01-30-05 15:24 Will New Issue 01-30-05 15:24 Will Kernel Version => 2.6.10 04-13-05 22:01 jdthood Note Added: 0004480 04-13-05 22:26 rlrevell Note Added: 0004484 04-14-05 15:20 Will Note Added: 0004493 04-14-05 22:01 jdthood Status new => acknowledged 08-08-05 15:11 agoode Issue Monitored: agoode 08-08-05 15:20 agoode Note Added: 0005709 08-08-05 15:21 agoode File Added: asfxload.trace 08-08-05 17:32 Will Note Added: 0005710 12-31-05 03:30 rlrevell Note Added: 0007329 03-16-06 11:56 Will Note Added: 0008601 07-18-06 14:39 jcdutton Status acknowledged => assigned 07-18-06 14:39 jcdutton Assigned To => jcdutton 07-19-06 01:30 agoode Note Added: 0011073 ====================================================================== ------------------------------------------------------------------------- Take Surveys. Earn Cash. 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