Hi All, [ Sorry about reposting. Someone suggested LAD, so I reposted this to both LAD and LAU. ] I bought BOSS BR-80 recently, which can be used as USB audio interface. Unfortunately, Fedora15(2.6.38.8) didn't recognize it. Maybe someone already made BR-80 work but my google search didn't show any hint, so I decided to hack. I added an entry to quirks-table.h for BR-80 (see below) and recompiled the snd-usb-audio module and re-installed the module. I also added a dmex and softvol config to .asoundrc(see also below). It now works as a playback device, which satisfies my current requirements. The capture interface and MIDI seems not working. The lsusb output contains a couple of 'UNRECOGNIZED' lines. lsusb output,/proc/asound/, etc are also below. Although I might not use these interfaces, I'm just curious to hack. Can anyone suggest where I should look at? Thanks, Kaz ======================================== --- sound/usb/quirks-table.h.orig 2011-08-06 21:17:32.686663306 -0500 +++ sound/usb/quirks-table.h 2011-07-26 19:05:21.790767824 -0500 @@ -1611,6 +1611,34 @@ } } }, +{ + USB_DEVICE(0x0582, 0x0130), + .driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) { + /* .vendor_name = "BOSS", */ + /* .product_name = "MICRO BR-80", */ + .ifnum = QUIRK_ANY_INTERFACE, + .type = QUIRK_COMPOSITE, + .data = (const struct snd_usb_audio_quirk[]) { + { + .ifnum = 0, + .type = QUIRK_AUDIO_STANDARD_INTERFACE + }, + { + .ifnum = 1, + .type = QUIRK_AUDIO_STANDARD_INTERFACE + }, + { + .ifnum = 2, + .type = QUIRK_MIDI_STANDARD_INTERFACE + }, + { + .ifnum = -1 + } + } + } +}, + + ======================================== $HOME/.asoundrc pcm.dmixer { type dmix ipc_key 333444 # uniq val slave { pcm { type hw; card BR80AUDIO; } period_time 0 period_size 1024 buffer_size 8192 rate 44100 } bindings { 0 0 1 1 } } #http://alsa.opensrc.org/How_to_use_softvol_to_control_the_master_volume pcm.softvol { type softvol slave { pcm "dmixer" } control { name "Master" card 0 # is this right? } } pcm.!default { type plug slave.pcm "softvol" } ======================================== $ find /proc/asound/BR80AUDIO/ -type f /proc/asound/BR80AUDIO/id /proc/asound/BR80AUDIO/usbbus /proc/asound/BR80AUDIO/usbid /proc/asound/BR80AUDIO/stream0 /proc/asound/BR80AUDIO/midi0 /proc/asound/BR80AUDIO/pcm0p/sub0/status /proc/asound/BR80AUDIO/pcm0p/sub0/sw_params /proc/asound/BR80AUDIO/pcm0p/sub0/hw_params /proc/asound/BR80AUDIO/pcm0p/sub0/info /proc/asound/BR80AUDIO/pcm0p/xrun_debug /proc/asound/BR80AUDIO/pcm0p/info ======================================== This message appears in kernel log [81902.426215] ALSA sound/usb/midi.c:1680: MIDIStreaming interface descriptor not found ======================================== lsusb output Bus 002 Device 008: ID 0582:0130 Roland Corp. Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 255 Vendor Specific Class bDeviceSubClass 0 bDeviceProtocol 255 bMaxPacketSize0 64 idVendor 0x0582 Roland Corp. idProduct 0x0130 bcdDevice 0.00 iManufacturer 1 iProduct 2 iSerial 0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 176 bNumInterfaces 4 bConfigurationValue 1 iConfiguration 0 bmAttributes 0xc0 Self Powered MaxPower 2mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 0 bInterfaceClass 255 Vendor Specific Class bInterfaceSubClass 255 Vendor Specific Subclass bInterfaceProtocol 0 iInterface 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 0 bNumEndpoints 0 bInterfaceClass 255 Vendor Specific Class bInterfaceSubClass 2 bInterfaceProtocol 2 iInterface 0 ** UNRECOGNIZED: 06 24 f1 01 00 00 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 1 bNumEndpoints 1 bInterfaceClass 255 Vendor Specific Class bInterfaceSubClass 2 bInterfaceProtocol 2 iInterface 0 ** UNRECOGNIZED: 07 24 01 01 00 01 00 ** UNRECOGNIZED: 0b 24 02 01 02 04 18 01 44 ac 00 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x0d EP 13 OUT bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0038 1x 56 bytes bInterval 1 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 2 bAlternateSetting 0 bNumEndpoints 0 bInterfaceClass 255 Vendor Specific Class bInterfaceSubClass 2 bInterfaceProtocol 1 iInterface 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 2 bAlternateSetting 1 bNumEndpoints 1 bInterfaceClass 255 Vendor Specific Class bInterfaceSubClass 2 bInterfaceProtocol 1 iInterface 0 ** UNRECOGNIZED: 07 24 01 07 00 01 00 ** UNRECOGNIZED: 0b 24 02 01 02 04 18 01 44 ac 00 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x8e EP 14 IN bmAttributes 37 Transfer Type Isochronous Synch Type Asynchronous Usage Type Implicit feedback Data wMaxPacketSize 0x0038 1x 56 bytes bInterval 1 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 3 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 255 Vendor Specific Class bInterfaceSubClass 3 bInterfaceProtocol 0 iInterface 0 ** UNRECOGNIZED: 06 24 f1 02 01 01 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x03 EP 3 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 1 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x84 EP 4 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 3 bAlternateSetting 1 bNumEndpoints 2 bInterfaceClass 255 Vendor Specific Class bInterfaceSubClass 3 bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x03 EP 3 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 1 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x85 EP 5 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 1