Last year, I switched to OpenBSD 4.0 (from FreeBSD) and noticed a
decrease of
the *heard* sound quality when playing the same files. It sounds like a
lower
bit rate (imagine a 96 kbit/s mp3 at higher volumes for example), but I
can't
pinpoint it, though.
My friends told me to fiddle with mixerctl inputs.dac, but I couldn't get it
any better.
My sound device is:
ac97: codec id 0x414c4720 (Avance Logic ALC650)
ac97: codec features 20 bit DAC, 18 bit ADC, Realtek 3D
audio0 at auvia0
See my full dmesg, mixerctl -a and audioctl -a below.
Thanks in advance for any hints
Marius
$ dmesg
OpenBSD 4.0 (GENERIC) #1107: Sat Sep 16 19:15:58 MDT 2006
[EMAIL PROTECTED]:/usr/src/sys/arch/i386/compile/GENERIC
cpu0: AMD Athlon(tm) XP 1500+ ("AuthenticAMD" 686-class, 256KB L2 cache)
1.36 GHz
cpu0:
FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE
real mem = 536375296 (523804K)
avail mem = 481329152 (470048K)
using 4256 buffers containing 26923008 bytes (26292K) of memory
mainbus0 (root)
bios0 at mainbus0: AT/286+(00) BIOS, date 07/10/02, BIOS32 rev. 0 @
0xfdad0, SMBIOS rev. 2.3 @ 0xf0630 (22 entries)
bios0: MSI MS-6380E
apm0 at bios0: Power Management spec V1.2
apm0: AC on, battery charge unknown
apm0: flags 30102 dobusy 0 doidle 1
pcibios0 at bios0: rev 2.1 @ 0xf0000/0x10000
pcibios0: PCI IRQ Routing Table rev 1.0 @ 0xf7f40/208 (11 entries)
pcibios0: PCI Interrupt Router at 000:17:0 ("VIA VT8235 ISA" rev 0x00)
pcibios0: PCI bus #1 is the last bus
bios0: ROM list: 0xc0000/0xe800
cpu0 at mainbus0
pci0 at mainbus0 bus 0: configuration mode 1 (no bios)
pchb0 at pci0 dev 0 function 0 "VIA VT8366 PCI" rev 0x00
ppb0 at pci0 dev 1 function 0 "VIA VT8366 AGP" rev 0x00
pci1 at ppb0 bus 1
vga1 at pci1 dev 0 function 0 "NVIDIA GeForce4 Ti 4600" rev 0xa3
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
rl0 at pci0 dev 7 function 0 "Realtek 8139" rev 0x10: irq 10, address
00:c0:df:07:72:dd
rlphy0 at rl0 phy 0: RTL internal PHY
uhci0 at pci0 dev 16 function 0 "VIA VT83C572 USB" rev 0x80: irq 11
usb0 at uhci0: USB revision 1.0
uhub0 at usb0
uhub0: VIA UHCI root hub, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
uhci1 at pci0 dev 16 function 1 "VIA VT83C572 USB" rev 0x80: irq 11
usb1 at uhci1: USB revision 1.0
uhub1 at usb1
uhub1: VIA UHCI root hub, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
uhci2 at pci0 dev 16 function 2 "VIA VT83C572 USB" rev 0x80: irq 10
usb2 at uhci2: USB revision 1.0
uhub2 at usb2
uhub2: VIA UHCI root hub, rev 1.00/1.00, addr 1
uhub2: 2 ports with 2 removable, self powered
ehci0 at pci0 dev 16 function 3 "VIA VT6202 USB" rev 0x82: irq 5
usb3 at ehci0: USB revision 2.0
uhub3 at usb3
uhub3: VIA EHCI root hub, rev 2.00/1.00, addr 1
uhub3: 6 ports with 6 removable, self powered
viapm0 at pci0 dev 17 function 0 "VIA VT8235 ISA" rev 0x00
iic0 at viapm0
"unknown" at iic0 addr 0x18 not configured
"unknown" at iic0 addr 0x2f not configured
pciide0 at pci0 dev 17 function 1 "VIA VT82C571 IDE" rev 0x06: ATA133,
channel 0 configured to compatibility, channel 1 configured to compatibility
atapiscsi0 at pciide0 channel 0 drive 0
scsibus0 at atapiscsi0: 2 targets
cd0 at scsibus0 targ 0 lun 0: <TSSTcorp, CD/DVDW TS-H552B, TS03> SCSI0
5/cdrom removable
wd0 at pciide0 channel 0 drive 1: <SAMSUNG SP1654N>
wd0: 16-sector PIO, LBA48, 152627MB, 312581808 sectors
cd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2
wd0(pciide0:0:1): using PIO mode 4, Ultra-DMA mode 2
wd1 at pciide0 channel 1 drive 0: <IC35L060AVER07-0>
wd1: 16-sector PIO, LBA, 58644MB, 120103200 sectors
wd2 at pciide0 channel 1 drive 1: <SAMSUNG SP1613N>
wd2: 16-sector PIO, LBA48, 152627MB, 312581808 sectors
wd1(pciide0:1:0): using PIO mode 4, Ultra-DMA mode 5
wd2(pciide0:1:1): using PIO mode 4, Ultra-DMA mode 5
auvia0 at pci0 dev 17 function 5 "VIA VT8233 AC97" rev 0x50: irq 10
ac97: codec id 0x414c4720 (Avance Logic ALC650)
ac97: codec features 20 bit DAC, 18 bit ADC, Realtek 3D
audio0 at auvia0
isa0 at mainbus0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pmsi0 at pckbc0 (aux slot)
pckbc0: using irq 12 for aux slot
wsmouse0 at pmsi0 mux 0
pcppi0 at isa0 port 0x61
midi0 at pcppi0: <PC speaker>
spkr0 at pcppi0
lpt0 at isa0 port 0x378/4 irq 7
lm0 at isa0 port 0x290/8: W83697HF
npx0 at isa0 port 0xf0/16: using exception 16
pccom0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
pccom1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo
fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
biomask ef65 netmask ef65 ttymask ffe7
pctr: user-level cycle counter enabled
mtrr: Pentium Pro MTRR support
dkcsum: wd0 matches BIOS drive 0x81
dkcsum: wd1 matches BIOS drive 0x80
dkcsum: wd2 matches BIOS drive 0x82
root on wd1a
rootdev=0x10 rrootdev=0x310 rawdev=0x312
$ mixerctl -a
outputs.master=199,199
outputs.master.mute=off
outputs.mono=255
outputs.mono.mute=on
outputs.mono.source=mixerout
outputs.headphones=255,255
outputs.headphones.mute=off
outputs.bass=255
outputs.treble=255
inputs.speaker=255
inputs.speaker.mute=off
inputs.phone=191
inputs.phone.mute=on
inputs.mic=191
inputs.mic.mute=on
inputs.mic.preamp=off
inputs.mic.source=mic0
inputs.line=191,191
inputs.line.mute=on
inputs.cd=191,191
inputs.cd.mute=off
inputs.video=191,191
inputs.video.mute=on
inputs.aux=191,191
inputs.aux.mute=on
inputs.dac=191,191
inputs.dac.mute=off
record.source=mic
record.volume=255,255
record.volume.mute=off
record.mic=0
record.mic.mute=off
outputs.loudness=off
outputs.spatial=off
outputs.spatial.center=0
outputs.spatial.depth=0
outputs.surround=255,255
outputs.surround.mute=on
outputs.center=255
outputs.center.mute=on
outputs.lfe=255
outputs.lfe.mute=on
outputs.extamp=off
$ audioctl -a
name=VIA VT8233
version=
config=auvia
encodings=ulinear:8,mulaw:8*,alaw:8*,slinear:8*,slinear_le:16,ulinear_le:16*,slinear_be:16*,ulinear_be:16*
properties=full_duplex,mmap,independent
full_duplex=0
fullduplex=0
blocksize=800
hiwat=81
lowat=1
monitor_gain=0
mode=
play.rate=8000
play.channels=1
play.precision=8
play.encoding=mulaw
play.gain=127
play.balance=32
play.port=0x0
play.avail_ports=0x0
play.seek=0
play.samples=0
play.eof=0
play.pause=0
play.error=0
play.waiting=0
play.open=0
play.active=0
play.buffer_size=65536
record.rate=8000
record.channels=1
record.precision=8
record.encoding=mulaw
record.gain=191
record.balance=32
record.port=0x1
record.avail_ports=0x7
record.seek=0
record.samples=0
record.eof=0
record.pause=0
record.error=0
record.waiting=0
record.open=0
record.active=0
record.buffer_size=65536
record.errors=0
