ACPI causes stutters in Maestro3 playback on Inspiron4000

Copyright (c) 1992-2002 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
	The Regents of the University of California. All rights reserved.
FreeBSD 5.0-CURRENT #7: Fri Aug 16 12:12:49 EDT 2002
    [email protected]:/usr/obj/usr/src/sys/DAEMON
Preloaded elf kernel "/boot/kernel/kernel" at 0xc042c000.
Preloaded elf module "/boot/kernel/snd_maestro3.ko" at 0xc042c0a8.
Preloaded elf module "/boot/kernel/snd_pcm.ko" at 0xc042c15c.
Preloaded elf module "/boot/kernel/acpi.ko" at 0xc042c208.
Timecounter "i8254"  frequency 1193182 Hz
Timecounter "TSC"  frequency 701594325 Hz
CPU: Pentium III/Pentium III Xeon/Celeron (701.59-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x686  Stepping = 6
  Features=0x383f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE>
real memory  = 268353536 (262064K bytes)
avail memory = 255815680 (249820K bytes)
Pentium Pro MTRR support enabled
Using $PIR table, 9 entries at 0xc00fbd80
npx0: <math processor> on motherboard
npx0: INT 16 interface
acpi0: <DELL   CPi R  > on motherboard
Timecounter "ACPI-safe"  frequency 3579545 Hz
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x808-0x80b on acpi0
acpi_cpu0: <CPU> on acpi0
acpi_tz0: <thermal zone> on acpi0
acpi_acad0: <AC adapter> on acpi0
acpi_cmbat0: <Control method Battery> on acpi0
acpi_cmbat1: <Control method Battery> on acpi0
acpi_lid0: <Control Method Lid Switch> on acpi0
acpi_button0: <Power Button> on acpi0
acpi_button1: <Sleep Button> on acpi0
acpi_pcib0: <Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <PCI bus> on acpi_pcib0
agp0: <Intel 82443BX (440 BX) host to PCI bridge> mem 0xe0000000-0xe3ffffff at device 0.0 on pci0
pcib1: <PCI-PCI bridge> at device 1.0 on pci0
pci1: <PCI bus> on pcib1
pci1: <display, VGA> at device 0.0 (no driver attached)
pci0: <bridge, PCI-CardBus> at device 3.0 (no driver attached)
pci0: <bridge, PCI-CardBus> at device 3.1 (no driver attached)
isab0: <PCI-ISA bridge> at device 7.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel PIIX4 ATA33 controller> port 0x860-0x86f at device 7.1 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0
uhci0: <Intel 82371AB/EB (PIIX4) USB controller> port 0xdce0-0xdcff irq 11 at device 7.2 on pci0
usb0: <Intel 82371AB/EB (PIIX4) USB controller> on uhci0
usb0: USB revision 1.0
uhub0: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
pci0: <bridge, PCI-unknown> at device 7.3 (no driver attached)
pcm0: <ESS Technology Maestro3> port 0xd800-0xd8ff mem 0xfbffe000-0xfbffffff irq 5 at device 8.0 on pci0
xl0: <3Com 3c556 Fast Etherlink XL> port 0xd400-0xd4ff mem 0xfbffd800-0xfbffd87f,0xfbffdc00-0xfbffdc7f irq 11 at device 16.0 on pci0
xl0: Ethernet address: 00:01:03:85:8c:38
miibus0: <MII bus> on xl0
ukphy0: <Generic IEEE 802.3u media interface> on miibus0
ukphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
pci0: <simple comms> at device 16.1 (no driver attached)
atkbdc0: <Keyboard controller (i8042)> port 0x64,0x60 irq 1 on acpi0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: model IntelliMouse, device ID 3
fdc0: <enhanced floppy controller (i82077, NE72065 or clone)> port 0x3f7,0x3f2-0x3f5 irq 6 drq 2 on acpi0
fdc0: FIFO enabled, 8 bytes threshold
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
sio0 port 0x3f8-0x3ff irq 4 on acpi0
sio0: type 16550A
sio1 port 0x280-0x287,0x2f8-0x2ff irq 3 drq 3 on acpi0
sio1: type 16550A
ppc0 port 0x778-0x77b,0x378-0x37f irq 7 on acpi0
ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/8 bytes threshold
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
orm0: <Option ROMs> at iomem 0xd3800-0xd3fff,0xd3000-0xd37ff,0xd2800-0xd2fff,0xd2000-0xd27ff,0xd1800-0xd1fff,0xd1000-0xd17ff,0xd0800-0xd0fff,0xd0000-0xd07ff,0xc0000-0xcffff on isa0
pcic0 at port 0x3e0 iomem 0xa0000-0xa1fff irq 10 on isa0
pcic_attach: attach found no sockets
device_probe_and_attach: pcic0 attach returned 6
pmtimer0 on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
Timecounters tick every 10.000 msec
ad0: 19077MB <IBM-DJSA-220> [38760/16/63] at ata0-master UDMA33
acd0: CDROM <TEAC CD-ROM CD-224E> at ata1-master PIO4
Mounting root from ufs:/dev/ad0s2a