Jon Smirl wrote: I have the Logitech USB headphones and they also show "noserial" designation. It's just the way hal module labels the sinks (based on hardware capabilities, if you go to /proc/asound/<card>/ and look around in the files - you'll see where all those extra bits come from). As a side-note - it would be nice to do it like hotplug does it - meaning - maintain a mapping between ugly sink names and nice and legible sink names. (or maybe renaming sinks in runtime and maintaining that as well, so it works after plug/unplug). If you plug several devices their card numbers will be different, so you can expect something like alsa_output.usb_device_471_155_noserial_if0_alsa_playback_0 alsa_output.usb_device_471_155_noserial_if1_alsa_playback_1 alsa_output.usb_device_471_155_noserial_if2_alsa_playback_2 or something like that. V. > I see the devices are using the PCI / USB ID for their name. > > alsa_output.usb_device_471_155_noserial_if0_alsa_playback_0 > alsa_output.pci_device_8086_24d6_alsa_playback_0 > > Normal display includes the leading zeros > jonsmirl at jonsmirl:~$ lsusb > Bus 002 Device 002: ID 0471:0155 Philips > > What does the noserial indicate? > What do the names look like if I plug in several identical devices? > > The Philips device has a complex interface.... > > Bus 002 Device 002: ID 0471:0155 Philips > Device Descriptor: > bLength 18 > bDescriptorType 1 > bcdUSB 1.10 > bDeviceClass 0 (Defined at Interface level) > bDeviceSubClass 0 > bDeviceProtocol 0 > bMaxPacketSize0 8 > idVendor 0x0471 Philips > idProduct 0x0155 > bcdDevice 4.14 > iManufacturer 1 Philips Electronics > iProduct 2 Philips PSC805 > iSerial 0 > bNumConfigurations 1 > Configuration Descriptor: > bLength 9 > bDescriptorType 2 > wTotalLength 235 > bNumInterfaces 4 > bConfigurationValue 1 > iConfiguration 0 > bmAttributes 0x80 > (Bus Powered) > MaxPower 500mA > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 0 > bNumEndpoints 0 > bInterfaceClass 1 Audio > bInterfaceSubClass 1 Control Device > bInterfaceProtocol 0 > iInterface 0 > AudioControl Interface Descriptor: > bLength 10 > bDescriptorType 36 > bDescriptorSubtype 1 (HEADER) > bcdADC 1.00 > wTotalLength 88 > bInCollection 2 > baInterfaceNr( 0) 1 > baInterfaceNr( 1) 2 > AudioControl Interface Descriptor: > bLength 12 > bDescriptorType 36 > bDescriptorSubtype 2 (INPUT_TERMINAL) > bTerminalID 1 > wTerminalType 0x0101 USB Streaming > bAssocTerminal 0 > bNrChannels 6 > wChannelConfig 0x003f > Left Front (L) > Right Front (R) > Center Front (C) > Low Freqency Enhancement (LFE) > Left Surround (LS) > Right Surround (RS) > iChannelNames 0 > iTerminal 0 > AudioControl Interface Descriptor: > bLength 14 > bDescriptorType 36 > bDescriptorSubtype 6 (FEATURE_UNIT) > bUnitID 2 > bSourceID 1 > bControlSize 1 > bmaControls( 0) 0x01 > Mute > bmaControls( 1) 0x02 > Volume > bmaControls( 2) 0x02 > Volume > bmaControls( 3) 0x02 > Volume > bmaControls( 4) 0x02 > Volume > bmaControls( 5) 0x02 > Volume > bmaControls( 6) 0x02 > Volume > iFeature 0 > AudioControl Interface Descriptor: > bLength 9 > bDescriptorType 36 > bDescriptorSubtype 3 (OUTPUT_TERMINAL) > bTerminalID 3 > wTerminalType 0x0301 Speaker > bAssocTerminal 0 > bSourceID 2 > iTerminal 0 > AudioControl Interface Descriptor: > bLength 12 > bDescriptorType 36 > bDescriptorSubtype 2 (INPUT_TERMINAL) > bTerminalID 4 > wTerminalType 0x0603 Line Connector > bAssocTerminal 0 > bNrChannels 2 > wChannelConfig 0x0003 > Left Front (L) > Right Front (R) > iChannelNames 0 > iTerminal 0 > AudioControl Interface Descriptor: > bLength 10 > bDescriptorType 36 > bDescriptorSubtype 6 (FEATURE_UNIT) > bUnitID 5 > bSourceID 4 > bControlSize 1 > bmaControls( 0) 0x01 > Mute > bmaControls( 1) 0x02 > Volume > bmaControls( 2) 0x02 > Volume > iFeature 0 > AudioControl Interface Descriptor: > bLength 12 > bDescriptorType 36 > bDescriptorSubtype 4 (MIXER_UNIT) > bUnitID 6 > bNrInPins 1 > baSourceID( 0) 5 > bNrChannels 2 > wChannelConfig 0x0003 > Left Front (L) > Right Front (R) > iChannelNames 0 > bmControls 0x00 > iMixer 0 > AudioControl Interface Descriptor: > bLength 9 > bDescriptorType 36 > bDescriptorSubtype 3 (OUTPUT_TERMINAL) > bTerminalID 7 > wTerminalType 0x0101 USB Streaming > bAssocTerminal 0 > bSourceID 6 > iTerminal 0 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 1 > bAlternateSetting 0 > bNumEndpoints 0 > bInterfaceClass 1 Audio > bInterfaceSubClass 2 Streaming > bInterfaceProtocol 0 > iInterface 0 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 1 > bAlternateSetting 1 > bNumEndpoints 1 > bInterfaceClass 1 Audio > bInterfaceSubClass 2 Streaming > bInterfaceProtocol 0 > iInterface 0 > AudioStreaming Interface Descriptor: > bLength 7 > bDescriptorType 36 > bDescriptorSubtype 1 (AS_GENERAL) > bTerminalLink 1 > bDelay 1 frames > wFormatTag 1 PCM > AudioStreaming Interface Descriptor: > bLength 11 > bDescriptorType 36 > bDescriptorSubtype 2 (FORMAT_TYPE) > bFormatType 1 (FORMAT_TYPE_I) > bNrChannels 6 > bSubframeSize 2 > bBitResolution 16 > bSamFreqType 1 Discrete > tSamFreq[ 0] 48000 > Endpoint Descriptor: > bLength 9 > bDescriptorType 5 > bEndpointAddress 0x01 EP 1 OUT > bmAttributes 9 > Transfer Type Isochronous > Synch Type Adaptive > Usage Type Data > wMaxPacketSize 0x0240 1x 576 bytes > bInterval 1 > bRefresh 0 > bSynchAddress 0 > AudioControl Endpoint Descriptor: > bLength 7 > bDescriptorType 37 > bDescriptorSubtype 1 (EP_GENERAL) > bmAttributes 0x01 > Sampling Frequency > bLockDelayUnits 0 Undefined > wLockDelay 0 Undefined > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 2 > bAlternateSetting 0 > bNumEndpoints 0 > bInterfaceClass 1 Audio > bInterfaceSubClass 2 Streaming > bInterfaceProtocol 0 > iInterface 0 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 2 > bAlternateSetting 1 > bNumEndpoints 1 > bInterfaceClass 1 Audio > bInterfaceSubClass 2 Streaming > bInterfaceProtocol 0 > iInterface 0 > AudioStreaming Interface Descriptor: > bLength 7 > bDescriptorType 36 > bDescriptorSubtype 1 (AS_GENERAL) > bTerminalLink 7 > bDelay 1 frames > wFormatTag 1 PCM > AudioStreaming Interface Descriptor: > bLength 11 > bDescriptorType 36 > bDescriptorSubtype 2 (FORMAT_TYPE) > bFormatType 1 (FORMAT_TYPE_I) > bNrChannels 2 > bSubframeSize 2 > bBitResolution 16 > bSamFreqType 1 Discrete > tSamFreq[ 0] 48000 > Endpoint Descriptor: > bLength 9 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 13 > Transfer Type Isochronous > Synch Type Synchronous > Usage Type Data > wMaxPacketSize 0x00c0 1x 192 bytes > bInterval 1 > bRefresh 0 > bSynchAddress 0 > AudioControl Endpoint Descriptor: > bLength 7 > bDescriptorType 37 > bDescriptorSubtype 1 (EP_GENERAL) > bmAttributes 0x01 > Sampling Frequency > bLockDelayUnits 0 Undefined > wLockDelay 0 Undefined > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 3 > bAlternateSetting 0 > bNumEndpoints 1 > bInterfaceClass 3 Human Interface Devices > bInterfaceSubClass 0 No Subclass > bInterfaceProtocol 0 None > iInterface 0 > HID Device Descriptor: > bLength 9 > bDescriptorType 33 > bcdHID 1.00 > bCountryCode 0 Not supported > bNumDescriptors 1 > bDescriptorType 34 Report > wDescriptorLength 128 > Report Descriptors: > ** UNAVAILABLE ** > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x83 EP 3 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0003 1x 3 bytes > bInterval 10 > Device Status: 0x0000 > (Bus Powered) > > Bus 002 Device 001: ID 0000:0000 > Device Descriptor: > bLength 18 > bDescriptorType 1 > bcdUSB 1.10 > bDeviceClass 9 Hub > bDeviceSubClass 0 Unused > bDeviceProtocol 0 Full speed hub > bMaxPacketSize0 64 > idVendor 0x0000 > idProduct 0x0000 > bcdDevice 2.06 > iManufacturer 3 Linux 2.6.22-rc7-jds uhci_hcd > iProduct 2 UHCI Host Controller > iSerial 1 0000:00:1d.1 > bNumConfigurations 1 > Configuration Descriptor: > bLength 9 > bDescriptorType 2 > wTotalLength 25 > bNumInterfaces 1 > bConfigurationValue 1 > iConfiguration 0 > bmAttributes 0xe0 > Self Powered > Remote Wakeup > MaxPower 0mA > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 0 > bNumEndpoints 1 > bInterfaceClass 9 Hub > bInterfaceSubClass 0 Unused > bInterfaceProtocol 0 Full speed hub > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x81 EP 1 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0002 1x 2 bytes > bInterval 255 > Hub Descriptor: > bLength 9 > bDescriptorType 41 > nNbrPorts 2 > wHubCharacteristic 0x000a > No power switching (usb 1.0) > Per-port overcurrent protection > bPwrOn2PwrGood 1 * 2 milli seconds > bHubContrCurrent 0 milli Ampere > DeviceRemovable 0x00 > PortPwrCtrlMask 0xff > Hub Port Status: > Port 1: 0000.0103 power enable connect > Port 2: 0000.0100 power > Device Status: 0x0003 > Self Powered > Remote Wakeup Enabled
