In case anyone reads this, I fixed it myself: 1., I upgraded to kernel 4.18.5 (has probably nothing to do with it). 2., I updated the Firmware on the PX headphones. 3. Then I commented out the complete quirk for the PX in "quirks-table.h", recompiled the snd-usb-audio module and loaded it. 4. Connected the PX to the PC, but no sound yet - fiddled around with the settings in pavucontrol, no result. 5. Then I turned the headphones off and one once. 6. Then I switched the headphones profile in pavucontrol to "off", and then to "Analog Stereo output". Now I got sound. This is reproducible, so I would call this fixed - having to switch the profile once is just a minor inconvenience. Thanks for your support and all your dedicated work for the ALSA project everyone, have a nice week! Best regards Philipp Ludwig On 07/29/2018 12:55 PM, Philipp Ludwig wrote: > On 07/28/2018 10:09 PM, Clemens Ladisch via Alsa-user wrote: >> alsa@xxxxxxxxxxxxxxxxx wrote: >>> usb 3-4: New USB device found, idVendor=19b5, idProduct=0021, >>> bcdDevice=25.20 >>> usb 3-4: Product: PX USB >>> usb 3-4: Manufacturer: Bowers & Wilkins >>> snd-usb-audio: probe of 3-4:1.0 failed with error -22 >>> usb 3-4: 2:1: cannot get min/max values for control 2 (id 2) >>> snd-usb-audio: probe of 3-4:1.1 failed with error -22 >>> >>> Any advice on how I could debug this further? >> >> Please show the output of "lsusb -v" for this device. > > Here it is: > > Bus 003 Device 008: ID 19b5:0021 B & W Group > Device Descriptor: > bLength 18 > bDescriptorType 1 > bcdUSB 2.00 > bDeviceClass 0 (Defined at Interface level) > bDeviceSubClass 0 > bDeviceProtocol 0 > bMaxPacketSize0 64 > idVendor 0x19b5 B & W Group > idProduct 0x0021 > bcdDevice 25.20 > iManufacturer 1 Bowers & Wilkins > iProduct 2 PX USB > iSerial 3 ABCDEF0123456789 > bNumConfigurations 1 > Configuration Descriptor: > bLength 9 > bDescriptorType 2 > wTotalLength 153 > bNumInterfaces 3 > bConfigurationValue 1 > iConfiguration 0 > bmAttributes 0xc0 > Self 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 9 > bDescriptorType 36 > bDescriptorSubtype 1 (HEADER) > bcdADC 1.00 > wTotalLength 43 > bInCollection 1 > baInterfaceNr( 0) 1 > AudioControl Interface Descriptor: > bLength 12 > bDescriptorType 36 > bDescriptorSubtype 2 (INPUT_TERMINAL) > bTerminalID 1 > wTerminalType 0x0101 USB Streaming > bAssocTerminal 0 > bNrChannels 2 > wChannelConfig 0x0003 > Left Front (L) > Right Front (R) > iChannelNames 0 > iTerminal 0 > AudioControl Interface Descriptor: > bLength 13 > bDescriptorType 36 > bDescriptorSubtype 6 (FEATURE_UNIT) > bUnitID 2 > bSourceID 1 > bControlSize 2 > bmaControls( 0) 0x01 > bmaControls( 0) 0x00 > Mute Control > bmaControls( 1) 0x02 > bmaControls( 1) 0x00 > Volume Control > bmaControls( 2) 0x02 > bmaControls( 2) 0x00 > Volume Control > iFeature 0 > AudioControl Interface Descriptor: > bLength 9 > bDescriptorType 36 > bDescriptorSubtype 3 (OUTPUT_TERMINAL) > bTerminalID 3 > wTerminalType 0x0301 Speaker > bAssocTerminal 0 > bSourceID 2 > 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 0 frames > wFormatTag 1 PCM > AudioStreaming Interface Descriptor: > bLength 26 > bDescriptorType 36 > bDescriptorSubtype 2 (FORMAT_TYPE) > bFormatType 1 (FORMAT_TYPE_I) > bNrChannels 2 > bSubframeSize 2 > bBitResolution 16 > bSamFreqType 6 Discrete > tSamFreq[ 0] 48000 > tSamFreq[ 1] 44100 > tSamFreq[ 2] 32000 > tSamFreq[ 3] 22050 > tSamFreq[ 4] 16000 > tSamFreq[ 5] 8000 > AudioControl Endpoint Descriptor: > bLength 7 > bDescriptorType 37 > bDescriptorSubtype 1 (EP_GENERAL) > bmAttributes 0x81 > Sampling Frequency > MaxPacketsOnly > bLockDelayUnits 2 Decoded PCM samples > wLockDelay 0 Decoded PCM samples > Endpoint Descriptor: > bLength 9 > bDescriptorType 5 > bEndpointAddress 0x03 EP 3 OUT > bmAttributes 1 > Transfer Type Isochronous > Synch Type None > Usage Type Data > wMaxPacketSize 0x00c0 1x 192 bytes > bInterval 1 > bRefresh 0 > bSynchAddress 0 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 2 > bAlternateSetting 0 > bNumEndpoints 1 > bInterfaceClass 3 Human Interface Device > bInterfaceSubClass 0 No Subclass > bInterfaceProtocol 0 None > iInterface 0 > HID Device Descriptor: > bLength 9 > bDescriptorType 33 > bcdHID 1.11 > bCountryCode 0 Not supported > bNumDescriptors 1 > bDescriptorType 34 Report > wDescriptorLength 123 > Report Descriptors: > ** UNAVAILABLE ** > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x81 EP 1 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0040 1x 64 bytes > bInterval 1 > Device Status: 0x0000 > (Bus Powered) > > ------------------------------------------------------------------------------ > > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Alsa-user mailing list > Alsa-user@xxxxxxxxxxxxxxxxxxxxx > https://lists.sourceforge.net/lists/listinfo/alsa-user
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