I'm having a small problem with sound output not sounding quite right
under FreeBSD 5.0-CURRENT.

The sound mostly works.  I can play MP3s using mpg123/x11amp/xmms...
The problem is that when I start moving the mouse around a lot, the
sound distorts and the kernel occasionally spits out a message like:

Mar 8 16:07:17 choplifter /boot/kernel/kernel: pcm1: hwptr went
backwards 536 - > 444

Here's the uname output and contents of /dev/sndstat (the sound card
is built-in to the motherboard, one of the CS423x chips):

FreeBSD choplifter.telerama.com 5.0-20010126-CURRENT FreeBSD
5.0-20010126-CURRENT #1: Mon Feb 12 17:40:59 EST 2001
[EMAIL PROTECTED]:/usr/src/sys/compile/CHOPLIFTER i386

% cat /dev/sndstat
FreeBSD Audio Driver (newpcm) Feb  2 2001 12:08:32
Installed devices:
pcm1: <CS423x> at io 0x534 irq 5 drq 1:0 (1p/1r channels duplex)

The machine is a Pentium II 333MHz, and I never had any problems with
the sound distorting while playing MP3s in X-windows when I was
running 4.2-STABLE.  Also, I used to run KDE, now I use fvwm2, and the
machine is not loaded down at all...  (The CPU is mainly idle when the
sound distorts.)

Like I mentioned earlier, I really only hear the sound distort when
the mouse is moved quickly.  I can actually *compile* ports and as
long as I don't move the mouse, the sound is fine as far as I've

The kernel messages only appear every few minutes.  There were about
30-40 of them in /var/log/messages, usually occuring once or twice
every few minutes.

Anyone have any suggestions on what might be causing this problem?
Like I said, it was fine under 4.2-STABLE.  All of the hardware is
exactly the same as it was then...


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