Thanks for the answers!

Unfortunately, the magic "-P default:0" incantation did not do it;
jackd still fails five of six tests I tried.

I have three apps I'm using to test jackd:
ecasound, xmms' jack driver, and xmms' libjackasyn driver.

with jackd launched via "jackd -d alsa" with no other audio apps running, 
all three test apps work. 

launched via "jackd -d alsa -P default:0" with no other audio apps
running, only ecasound will produce sound.

launched via "jackd -d alsa -P default:0" with other audio apps
running, none of the three will produce sound. 

in each case where an app does not produce sound, 
what happens instead is that jackd consumes 100% of the available cpu 
time until killed. the app can be shot first, but jackd won't notice. 

any other suggestions? 

Also, how might I have found the default:0 notation myself? 
Is there some way to get alsa to enumerate the devices it knows about? 
The string "default:0" does not appear in "aplay -l" output, 
"aplay -L" output, or anywhere in /proc/asound/...


  --thanks again very much
  --akb

ps: those numbers again:
>> Configs:
>> 
>> I have alsa 1.0.11rc2, no asoundrc's,
>> nforce2 motherboard sound, snd_intel8x0 driver, 
>> debian linux (mixed sarge/etch) on intel, 2.6.16 kernel, 
>> 
>> aplay -L says:
>>   **** List of PLAYBACK Hardware Devices ****
>>   card 0: CK8 [NVidia CK8], device 0: Intel ICH [NVidia CK8]
>>     Subdevices: 0/1
>>     Subdevice #0: subdevice #0
>>   card 0: CK8 [NVidia CK8], device 2: Intel ICH - IEC958 [NVidia CK8 - 
>> IEC958]
>>     Subdevices: 1/1
>>     Subdevice #0: subdevice #0
>>   
>> aplay -l output is 165 lines long, so I won't include it here. 


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