Hi Keith, The lsusb output just shows that the endpoint is there, but not that it is getting connected when the device is initialized. Can you check dmesg output when you use the device for playback? This is what I see from dmesg when the implicit feedback endpoint is being used: [ 26.787360] usb 1-1.1: setting usb interface 1:1 [ 26.787367] Creating new playback data endpoint #d [ 26.787375] Creating new capture data endpoint #8e [ 26.787678] usb 1-1.1: Setting params for ep #d (type 0, 12 urbs), ret=0 [ 26.787685] usb 1-1.1: match_endpoint_audioformats: (fmt @6bc43c84) score 2 [ 26.787745] usb 1-1.1: Setting params for ep #8e (type 0, 12 urbs), ret=0 [ 26.787751] usb 1-1.1: Starting data EP @a14130b5 [ 26.788420] usb 1-1.1: Starting sync EP @720fb7cf Note the "Starting sync EP". Mike On Wed, Oct 14, 2020 at 9:35 AM Mailing Lists <maillist@xxxxxxxxxxxxxxx> wrote: > On Wed, 14 Oct 2020 at 17:12, Mike Oliphant <oliphant@xxxxxxxxxxxx> wrote: > >> Keith - are you getting an implicit feedback endpoint created when you >> run with the patch? >> > > Hi Mike, > > It appears that I do. For reference I'm on kernel 5.4.0-51: > > Bus 001 Device 007: ID 0582:01d6 Roland Corp. GT-1 > 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 0x01d6 > bcdDevice 0.00 > iManufacturer 1 BOSS > iProduct 2 GT-1 > iSerial 0 > bNumConfigurations 1 > Configuration Descriptor: > bLength 9 > bDescriptorType 2 > wTotalLength 0x00bc > bNumInterfaces 4 > bConfigurationValue 1 > iConfiguration 0 > bmAttributes 0xc0 > Self Powered > MaxPower 0mA > 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 > ** UNRECOGNIZED: 06 24 f1 04 16 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 > ** UNRECOGNIZED: 06 24 f1 04 16 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 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0200 1x 512 bytes > bInterval 4 > 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 4 > Device Qualifier (for other device speed): > bLength 10 > bDescriptorType 6 > bcdUSB 2.00 > bDeviceClass 255 Vendor Specific Class > bDeviceSubClass 0 > bDeviceProtocol 255 > bMaxPacketSize0 64 > bNumConfigurations 1 > can't get debug descriptor: Resource temporarily unavailable > Device Status: 0x0001 > Self Powered > > > -- > Keith A Milner >
