Donc j'au un casque audio logitect connecter en usb, qui reconnu, qui fonctionne puisque je m'entend, mai la ou sa mer**** 
c'est que l'application le reconnai pas ou ne reçois pas le son.
dans l'application on peux personnaliser un truc genre

Default (oss/dev/dsp)
Default network (8760:L)
other
voila le premier donne rien le deuxiemem semble s'activer mai ne donne rien

voici un lspci puis un lsusb

mch:/home/tnt# lspci
00:00.0 Memory controller: nVidia Corporation CK804 Memory Controller (rev a4)
00:01.0 ISA bridge: nVidia Corporation CK804 ISA Bridge (rev a4)
00:01.1 SMBus: nVidia Corporation CK804 SMBus (rev a2)
00:02.0 USB Controller: nVidia Corporation CK804 USB Controller (rev a2)
00:02.1 USB Controller: nVidia Corporation CK804 USB Controller (rev a4)
00:04.0 Multimedia audio controller: nVidia Corporation CK804 AC'97 Audio Controller (rev a2)
00:06.0 IDE interface: nVidia Corporation CK804 IDE (rev f3)
00:07.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller (rev f3)
00:08.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller (rev f3)
00:09.0 PCI bridge: nVidia Corporation CK804 PCI Bridge (rev a2)
00:0a.0 Bridge: nVidia Corporation CK804 Ethernet Controller (rev a3)
00:0b.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
00:0c.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
00:0d.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
00:0e.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
01:00.0 VGA compatible controller: nVidia Corporation Unknown device 0191 (rev a2)
05:0a.0 RAID bus controller: Silicon Image, Inc. SiI 3114 [SATALink/SATARaid] Serial ATA Controller (rev 02)
05:0b.0 FireWire (IEEE 1394): Texas Instruments TSB43AB22/A IEEE-1394a-2000 Controller (PHY/Link)
05:0c.0 Ethernet controller: Marvell Technology Group Ltd. 88E8001 Gigabit Ethernet Controller (rev 13)
mch:/home/tnt# lsusb
Bus 002 Device 003: ID 046d:c01e Logitech, Inc. MX518 Optical Mouse
Bus 002 Device 002: ID 05e3:0605 Genesys Logic, Inc. USB 2.0 Hub [ednet]
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 002: ID 046d:0a02 Logitech, Inc.
Bus 001 Device 001: ID 0000:0000