Re: [Alsa-user] via8233: noisy playback

[Luc L. <lu...@tr...>]

I have more to add..

I think I now know what's going on. The clue came to me when I switched to
another desktop display: the sound went smooth. The choppiness went away.

This is my system:
AMD Athlon(tm) Processor    cpu MHz		: 1050.034
MainBoard: K7T266 Pro2 with VIA KT266A Chipset.
Video: NVidia GeForce3 

The via8233 device which handles the sound, also handles PCItoISA Bridge
(pointless, no ISA slots on mainboard), IDE, USB, and,	I assume,  the PCI bus
itself.

. That explains the hardlocks I've gotten in the past with the 0.5.12a driver.
. so.. 

. I'm probably repeating something someone else said with all this.. .. but it
doesn't replace the fact that the jitters are happening. Is there a way to
isolate the sound functions from the rest of the card's priority?

-- Luc


-------------------------------------------------------------------------------
----------
[firesoul@nethack firesoul]$ cat /proc/pci
PCI devices found:
(..snip)
  Bus  0, device  17, function	0:
    ISA bridge: VIA Technologies, Inc. VT8233 PCI to ISA Bridge (rev 0).
  Bus  0, device  17, function	1:
    IDE interface: VIA Technologies, Inc. Bus Master IDE (rev 6).
      Master Capable.  Latency=32.  
      I/O at 0xfc00 [0xfc0f].
  Bus  0, device  17, function	4:
    USB Controller: VIA Technologies, Inc. UHCI USB (#3) (rev 27).
      IRQ 5.
      Master Capable.  Latency=64.  
      I/O at 0xe400 [0xe41f].
  Bus  0, device  17, function	3:
    USB Controller: VIA Technologies, Inc. UHCI USB (#2) (rev 27).
      IRQ 5.
      Master Capable.  Latency=64.  
      I/O at 0xe000 [0xe01f].
  Bus  0, device  17, function	2:
    USB Controller: VIA Technologies, Inc. UHCI USB (rev 27).
      IRQ 5.
      Master Capable.  Latency=64.  
      I/O at 0xdc00 [0xdc1f].
  Bus  0, device  17, function	5:
    Multimedia audio controller: VIA Technologies, Inc. AC97 Audio Controller
(rev 16).
      IRQ 5.
      I/O at 0xe800 [0xe8ff].
(snip...)
-------------------------------------------------------------------------------
----------


On 28 Feb 2002 16:34:18 EST, Luc Lanthier said:

> 
>  It's not just you.
>  Using the Alsa 0.5.12a driver, everything works fine for us here at
>  TransGaming, except for the occasional complete hardware lockup.
>  
>  .. I've installed 0.9.12 from CVS and there are no lockups, yet.. but XMMS
>  playback is as you described: jittery and annoying. Playing UO from wineX
>  doesn't crash anymore but it's choppy because of the sound.
>  .. and I mean __choppy__. :-/
>  
>  .. if anyone is willing to give me pointers on how to debug this, I'm all ears.
>  -- Luc
>  
>  On Wed, 27 Feb 2002 10:42:58 +0100, Stefan Lange said:
>  
>  > Hi,
>  >  I'm using the ac97-codec for the onboard sound of my motherboard. It's 
>  >  an EPOX 8KHA+ with VIA KT266A chipset, with a 8233 southbridge. I'm 
>  >  using the snd-via8233 driver from current cvs. It works, but there are 
>  >  some quality issues:
>  >  
>  >  The sampling rate seems to be locked at 48 kHz
>  >  the snd_ac97_clock option doesn't seem to work for changing the rate to 
>  >  44.1 kHz
>  >  I changed xmms to output 48 kHz, which made quality a lot better. Is 
>  >  that a hardware or a driver limitation?
>  >  
>  >  Although playback is quite OK with 48 kHz, there a some really annoying 
>  >  "blips and clicks" now and then. I didn't investigate that very 
>  >  thoroughly, but I think I didn't hear these clicks using win98 on the 
>  >  same machine, so I assume it's a driver issue.
>  >  
>  >  Am I missing out something, or is it the driver's fault?
>  >  
>  >  Thanks in advance
>  >  
>  >  Stefan
>  >  
>  >  Please CC me, as I'm not subscribed to the list
>  >  
>  >  _______________________________________________
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>  >  
>  >  
>  >  
>  
>  -- 
>  Luc Lanthier, Support Staff Agent
>  TransGaming Technologies Inc.
>  http://www.transgaming.com
>  lu...@tr...
>  
>  
>  _______________________________________________
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>  
>  
>  

-- 
Luc Lanthier, Support Staff Agent
TransGaming Technologies Inc.
http://www.transgaming.com
lu...@tr...