usb experts.. im running gentoo linux.
Linux laptop 2.4.24 #1 Wed Jan 14 14:00:23 EST 2004 i686 Intel(R) 
Pentium(R) 4 Mobile CPU 1.80GHz GenuineIntel GNU/Linux

ive got the usb-audio compiled as a module and its loaded
laptop jason # lsmod | grep -i audio
audio                  43160   0  (unused)
soundcore               3940   3  [audio]
laptop jason # 

when I plug the headset in, It seems to get recognized..
the objects in /dev/sound appear..
laptop sound $ pwd
/dev/sound
laptop sound $ ls -al
total 0
drwxr-xr-x    1 root     root            0 Dec 31  1969 .
drwxr-xr-x    1 root     root            0 Dec 31  1969 ..
crw-rw----    1 root     audio     14,   3 Dec 31  1969 dsp
crw-rw----    1 root     audio     14,   0 Dec 31  1969 mixer
crw-rw----    1 root     audio     14,  16 Dec 31  1969 mixer1
laptop sound $ 

here is the output of /proc/bus/usb/devices

T:  Bus=03 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=12  MxCh= 2
B:  Alloc=  0/900 us ( 0%), #Int=  0, #Iso=  0
D:  Ver= 1.00 Cls=09(hub  ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=0000 ProdID=0000 Rev= 0.00
S:  Product=USB UHCI Root Hub
S:  SerialNumber=1840
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr=  0mA
I:  If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   8 Ivl=255ms
T:  Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=12  MxCh= 2
B:  Alloc= 12/900 us ( 1%), #Int=  1, #Iso=  0
D:  Ver= 1.00 Cls=09(hub  ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1                  
P:  Vendor=0000 ProdID=0000 Rev= 0.00
S:  Product=USB UHCI Root Hub                                                 
S:  SerialNumber=1820
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr=  0mA                                        
I:  If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   8 Ivl=255ms                                 
T:  Bus=02 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#=  9 Spd=12  MxCh= 0
D:  Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1                  
P:  Vendor=047f ProdID=0ca1 Rev= 0.04
S:  Manufacturer=Plantronics                                                  
S:  Product=Plantronics Headset
S:  SerialNumber=00400-0429034410003-V060000A                                 
C:* #Ifs= 4 Cfg#= 1 Atr=80 MxPwr=100mA
I:  If#= 0 Alt= 0 #EPs= 0 Cls=01(audio) Sub=01 Prot=00 Driver=audio           
I:  If#= 1 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=audio
I:  If#= 1 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=audio
E:  Ad=01(O) Atr=09(Isoc) MxPS= 100 Ivl=1ms                                   
I:  If#= 1 Alt= 2 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=audio
E:  Ad=01(O) Atr=09(Isoc) MxPS= 200 Ivl=1ms
I:  If#= 2 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=audio
I:  If#= 2 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=audio
E:  Ad=84(I) Atr=09(Isoc) MxPS=  50 Ivl=1ms
I:  If#= 2 Alt= 2 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=audio
E:  Ad=84(I) Atr=09(Isoc) MxPS= 100 Ivl=1ms
I:  If#= 2 Alt= 3 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=audio
E:  Ad=84(I) Atr=09(Isoc) MxPS= 200 Ivl=1ms
I:  If#= 3 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=00 Prot=00 Driver=hid
E:  Ad=83(I) Atr=03(Int.) MxPS=   2 Ivl=3ms
T:  Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=12  MxCh= 2
B:  Alloc=  0/900 us ( 0%), #Int=  0, #Iso=  0
D:  Ver= 1.00 Cls=09(hub  ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=0000 ProdID=0000 Rev= 0.00
S:  Product=USB UHCI Root Hub
S:  SerialNumber=1800
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr=  0mA
I:  If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   8 Ivl=255ms


but when I try to play audio with xmms or mplayer, they crash and I see 
the following in syslog

Feb 18 21:00:29 laptop usbdevfs: USBDEVFS_CONTROL failed dev 9 rqt 128 rq 
6 len 369 ret -6
Feb 18 21:00:29 laptop host/usb-uhci.c: ENXIO 80000980, flags 0, urb 
db372e00, burb df3d0d80
Feb 18 21:00:29 laptop usbdevfs: USBDEVFS_CONTROL failed dev 9 rqt 128 rq 
6 len 369 ret -6
Feb 18 21:00:29 laptop host/usb-uhci.c: ENXIO 80000980, flags 0, urb 
df3d0d80, burb db372e00
Feb 18 21:00:29 laptop usbdevfs: USBDEVFS_CONTROL failed dev 9 rqt 128 rq 
6 len 369 ret -6
Feb 18 21:00:29 laptop host/usb-uhci.c: ENXIO 80000980, flags 0, urb 
db372e00, burb df3d0d80
Feb 18 21:00:29 laptop usbdevfs: USBDEVFS_CONTROL failed dev 9 rqt 128 rq 
6 len 369 ret -6
Feb 18 21:00:29 laptop /etc/hotplug/usb.agent: ... no modules for USB 
product 47f/ca1/4

Im guessing something is still configured wrong, but im not sure what.
Should I be able to control this headset under ALSA?

regards,
Jason



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