linux-kernel - Re: [Alsa-user] PCM distorsion snapshots from SATA/ALSA conflict

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Date:	Sat, 14 Oct 2006 17:04:03 +0200
From:	Dominique Dumont <domi.dumont@...e.fr>
To:	Lee Revell <rlrevell@...-job.com>
Cc:	alsa-user <alsa-user@...ts.sourceforge.net>,
	Francesco Peeters <Francesco@...Peeters.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [Alsa-user] PCM distorsion snapshots from SATA/ALSA conflict

Lee Revell <rlrevell@...-job.com> writes:

> (it's probably a bad idea to attach .jpgs to a LKML post - please post
> them on the web and send a URL)

(ok. But is there a site that will guarantee the availability of the
jpg attachments when people are searching the lklm or alsa archives ?
)

> You seem to be using a period size of 256 samples - any change if you
> use a larger period size?

Unless I'm wrong, you want me to test the PCM output while modifying
the --period option of speaker-test.

So I've tested this command:
  speaker-test -D iec958 -c 2 -f 1000 -p 4096 -t sine -s 2

No change: I still have a lot of spikes in the sine wave.

> Any change if you use setpci to increase LATENCY_TIMER for the SBLive!
> card?

To be sure I've done the correct tests, here are the commands are used:

$ lspci
[...]
01:07.0 Multimedia audio controller: Creative Labs SB Live! EMU10k1 (rev 0a)
01:07.1 Input device controller: Creative Labs SB Live! Game Port (rev 0a)
[...]
01:0b.0 RAID bus controller: Silicon Image, Inc. SiI 3112 [SATALink/SATARaid] Serial ATA Controller (rev 02)

$ sudo setpci -s 01:07.0 latency_timer=80
$ sudo setpci -s 01:07.0 latency_timer=f8
$ sudo setpci -s 01:0b.0 latency_timer=10

No change at all :-(

Cheers

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