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Date:      Wed, 25 Nov 2020 09:04:21 +0000
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To:        freebsd-usb@freebsd.org
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Subject: webcamd, usb and two webcams - only one works
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Hello USB friends :)

I am having a hard time trying to get two webcams working simultaneously 
on FreeBSD 12.2-STABLE r367109 GENERIC amd64.

Each webcam works by itself, for example when taking a snapshot with 
pwcview:

sudo pwcview -h -c 1 -o foo.jpg -d /dev/video0

The webcam creates two video devices, video0 and video1. When I plug in 
the second webcam video2 and video3 are created. But trying to use the 
device doesn't work, pwcview hangs forever and multimedia/motion 
complains about timeouts when speaking to the camera.

If I swap the cameras around then "the other one" works, so I know both 
cameras are fine.

It seems somehow webcamd or maybe something in the usb system doesn't 
like having two cameras in my setup.

I tried temporarily replacing one of the webcams with another model, but 
the same result: the first webcam works, but the next one does not.

The webcams look like this to FreeBSD:
===============================

$ sudo usbconfig -d ugen0.5 dump_all_desc
ugen0.5: <Jieli Technology USB PHY 2.0> at usbus0, cfg=0 md=HOST 
spd=HIGH (480Mbps) pwr=ON (500mA)

   bLength = 0x0012
   bDescriptorType = 0x0001
   bcdUSB = 0x0200
   bDeviceClass = 0x00ef  <Miscellaneous device>
   bDeviceSubClass = 0x0002
   bDeviceProtocol = 0x0001
   bMaxPacketSize0 = 0x0040
   idVendor = 0x1224
   idProduct = 0x2a25
   bcdDevice = 0x0100
   iManufacturer = 0x0001  <Jieli Technology>
   iProduct = 0x0002  <USB PHY 2.0>
   iSerialNumber = 0x0000  <no string>
   bNumConfigurations = 0x0001

  Configuration index 0

     bLength = 0x0009
     bDescriptorType = 0x0002
     wTotalLength = 0x0273
     bNumInterfaces = 0x0004
     bConfigurationValue = 0x0001
     iConfiguration = 0x0000  <no string>
     bmAttributes = 0x0080
     bMaxPower = 0x00fa

     Additional Descriptor

     bLength = 0x08
     bDescriptorType = 0x0b
     bDescriptorSubType = 0x00
      RAW dump:
      0x00 | 0x08, 0x0b, 0x00, 0x02, 0x0e, 0x03, 0x00, 0x06


     Interface 0
       bLength = 0x0009
       bDescriptorType = 0x0004
       bInterfaceNumber = 0x0000
       bAlternateSetting = 0x0000
       bNumEndpoints = 0x0001
       bInterfaceClass = 0x000e  <Video device>
       bInterfaceSubClass = 0x0001
       bInterfaceProtocol = 0x0000
       iInterface = 0x0006  <USB CAMERA>

       Additional Descriptor

       bLength = 0x0d
       bDescriptorType = 0x24
       bDescriptorSubType = 0x01
        RAW dump:
        0x00 | 0x0d, 0x24, 0x01, 0x00, 0x01, 0x67, 0x00, 0x80,
        0x08 | 0xc3, 0xc9, 0x01, 0x01, 0x01


       Additional Descriptor

       bLength = 0x12
       bDescriptorType = 0x24
       bDescriptorSubType = 0x02
        RAW dump:
        0x00 | 0x12, 0x24, 0x02, 0x01, 0x01, 0x02, 0x00, 0x00,
        0x08 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0xff,
        0x10 | 0xff, 0x1f


       Additional Descriptor

       bLength = 0x0b
       bDescriptorType = 0x24
       bDescriptorSubType = 0x05
        RAW dump:
        0x00 | 0x0b, 0x24, 0x05, 0x02, 0x01, 0x00, 0x00, 0x02,
        0x08 | 0xff, 0xff, 0x00


       Additional Descriptor

       bLength = 0x1a
       bDescriptorType = 0x24
       bDescriptorSubType = 0x06
        RAW dump:
        0x00 | 0x1a, 0x24, 0x06, 0x03, 0x70, 0x33, 0xf0, 0x28,
        0x08 | 0x11, 0x63, 0x2e, 0x4a, 0xba, 0x2c, 0x68, 0x90,
        0x10 | 0xeb, 0x33, 0x40, 0x16, 0x08, 0x01, 0x02, 0x01,
        0x18 | 0x00, 0x00


       Additional Descriptor

       bLength = 0x1a
       bDescriptorType = 0x24
       bDescriptorSubType = 0x06
        RAW dump:
        0x00 | 0x1a, 0x24, 0x06, 0x04, 0x94, 0x73, 0xdf, 0xdd,
        0x08 | 0x3e, 0x97, 0x27, 0x47, 0xbe, 0xd9, 0x04, 0xed,
        0x10 | 0x64, 0x26, 0xdc, 0x67, 0x08, 0x01, 0x03, 0x01,
        0x18 | 0x00, 0x00


       Additional Descriptor

       bLength = 0x09
       bDescriptorType = 0x24
       bDescriptorSubType = 0x03
        RAW dump:
        0x00 | 0x09, 0x24, 0x03, 0x05, 0x01, 0x01, 0x00, 0x04,
        0x08 | 0x00

      Endpoint 0
         bLength = 0x0007
         bDescriptorType = 0x0005
         bEndpointAddress = 0x0085  <IN>
         bmAttributes = 0x0003  <INTERRUPT>
         wMaxPacketSize = 0x0040
         bInterval = 0x0004
         bRefresh = 0x0000
         bSynchAddress = 0x0000

       Additional Descriptor

       bLength = 0x05
       bDescriptorType = 0x25
       bDescriptorSubType = 0x03
        RAW dump:
        0x00 | 0x05, 0x25, 0x03, 0x40, 0x00



     Interface 1
       bLength = 0x0009
       bDescriptorType = 0x0004
       bInterfaceNumber = 0x0001
       bAlternateSetting = 0x0000
       bNumEndpoints = 0x0000
       bInterfaceClass = 0x000e  <Video device>
       bInterfaceSubClass = 0x0002
       bInterfaceProtocol = 0x0000
       iInterface = 0x0000  <no string>

       Additional Descriptor

       bLength = 0x0f
       bDescriptorType = 0x24
       bDescriptorSubType = 0x01
        RAW dump:
        0x00 | 0x0f, 0x24, 0x01, 0x02, 0xe1, 0x00, 0x84, 0x00,
        0x08 | 0x05, 0x02, 0x01, 0x00, 0x01, 0x00, 0x00


       Additional Descriptor

       bLength = 0x0b
       bDescriptorType = 0x24
       bDescriptorSubType = 0x06
        RAW dump:
        0x00 | 0x0b, 0x24, 0x06, 0x01, 0x02, 0x00, 0x01, 0x00,
        0x08 | 0x00, 0x00, 0x00


       Additional Descriptor

       bLength = 0x1e
       bDescriptorType = 0x24
       bDescriptorSubType = 0x07
        RAW dump:
        0x00 | 0x1e, 0x24, 0x07, 0x01, 0x00, 0x00, 0x05, 0xd0,
        0x08 | 0x02, 0x00, 0x00, 0x2f, 0x0d, 0x00, 0x00, 0x5e,
        0x10 | 0x1a, 0x00, 0x20, 0x1c, 0x00, 0x80, 0x1a, 0x06,
        0x18 | 0x00, 0x01, 0x80, 0x1a, 0x06, 0x00


       Additional Descriptor

       bLength = 0x1e
       bDescriptorType = 0x24
       bDescriptorSubType = 0x07
        RAW dump:
        0x00 | 0x1e, 0x24, 0x07, 0x02, 0x00, 0x80, 0x02, 0xe0,
        0x08 | 0x01, 0x00, 0x00, 0x65, 0x04, 0x00, 0x00, 0xca,
        0x10 | 0x08, 0x00, 0x60, 0x09, 0x00, 0x80, 0x1a, 0x06,
        0x18 | 0x00, 0x01, 0x80, 0x1a, 0x06, 0x00


       Additional Descriptor

       bLength = 0x16
       bDescriptorType = 0x24
       bDescriptorSubType = 0x03
        RAW dump:
        0x00 | 0x16, 0x24, 0x03, 0x00, 0x03, 0x00, 0x05, 0xd0,
        0x08 | 0x02, 0x80, 0x02, 0xe0, 0x01, 0x40, 0x01, 0xf0,
        0x10 | 0x00, 0x04, 0x01, 0x05, 0x0a, 0x14


       Additional Descriptor

       bLength = 0x06
       bDescriptorType = 0x24
       bDescriptorSubType = 0x0d
        RAW dump:
        0x00 | 0x06, 0x24, 0x0d, 0x01, 0x01, 0x04


       Additional Descriptor

       bLength = 0x1b
       bDescriptorType = 0x24
       bDescriptorSubType = 0x04
        RAW dump:
        0x00 | 0x1b, 0x24, 0x04, 0x02, 0x02, 0x59, 0x55, 0x59,
        0x08 | 0x32, 0x00, 0x00, 0x10, 0x00, 0x80, 0x00, 0x00,
        0x10 | 0xaa, 0x00, 0x38, 0x9b, 0x71, 0x10, 0x01, 0x00,
        0x18 | 0x00, 0x00, 0x00


       Additional Descriptor

       bLength = 0x1e
       bDescriptorType = 0x24
       bDescriptorSubType = 0x05
        RAW dump:
        0x00 | 0x1e, 0x24, 0x05, 0x01, 0x00, 0x00, 0x05, 0xd0,
        0x08 | 0x02, 0x00, 0x00, 0x2f, 0x0d, 0x00, 0x00, 0x5e,
        0x10 | 0x1a, 0x00, 0x20, 0x1c, 0x00, 0x80, 0x84, 0x1e,
        0x18 | 0x00, 0x01, 0x80, 0x84, 0x1e, 0x00


       Additional Descriptor

       bLength = 0x1e
       bDescriptorType = 0x24
       bDescriptorSubType = 0x05
        RAW dump:
        0x00 | 0x1e, 0x24, 0x05, 0x02, 0x00, 0x80, 0x02, 0xe0,
        0x08 | 0x01, 0x00, 0x00, 0x65, 0x04, 0x00, 0x00, 0xca,
        0x10 | 0x08, 0x00, 0x60, 0x09, 0x00, 0x80, 0x1a, 0x06,
        0x18 | 0x00, 0x01, 0x80, 0x1a, 0x06, 0x00


       Additional Descriptor

       bLength = 0x12
       bDescriptorType = 0x24
       bDescriptorSubType = 0x03
        RAW dump:
        0x00 | 0x12, 0x24, 0x03, 0x00, 0x03, 0x00, 0x05, 0xd0,
        0x08 | 0x02, 0x80, 0x02, 0xe0, 0x01, 0x40, 0x01, 0xf0,
        0x10 | 0x00, 0x00


       Additional Descriptor

       bLength = 0x06
       bDescriptorType = 0x24
       bDescriptorSubType = 0x0d
        RAW dump:
        0x00 | 0x06, 0x24, 0x0d, 0x01, 0x01, 0x04



     Interface 1 Alt 1
       bLength = 0x0009
       bDescriptorType = 0x0004
       bInterfaceNumber = 0x0001
       bAlternateSetting = 0x0001
       bNumEndpoints = 0x0001
       bInterfaceClass = 0x000e  <Video device>
       bInterfaceSubClass = 0x0002
       bInterfaceProtocol = 0x0000
       iInterface = 0x0000  <no string>

      Endpoint 0
         bLength = 0x0007
         bDescriptorType = 0x0005
         bEndpointAddress = 0x0084  <IN>
         bmAttributes = 0x0005  <ASYNC-ISOCHRONOUS>
         wMaxPacketSize = 0x1400
         bInterval = 0x0001
         bRefresh = 0x0000
         bSynchAddress = 0x0000

       Additional Descriptor

       bLength = 0x08
       bDescriptorType = 0x0b
       bDescriptorSubType = 0x02
        RAW dump:
        0x00 | 0x08, 0x0b, 0x02, 0x02, 0x01, 0x02, 0x00, 0x05



     Interface 2
       bLength = 0x0009
       bDescriptorType = 0x0004
       bInterfaceNumber = 0x0002
       bAlternateSetting = 0x0000
       bNumEndpoints = 0x0000
       bInterfaceClass = 0x0001  <Audio device>
       bInterfaceSubClass = 0x0001
       bInterfaceProtocol = 0x0000
       iInterface = 0x0005  <USB Microphone>

       Additional Descriptor

       bLength = 0x09
       bDescriptorType = 0x24
       bDescriptorSubType = 0x01
        RAW dump:
        0x00 | 0x09, 0x24, 0x01, 0x00, 0x01, 0x26, 0x00, 0x01,
        0x08 | 0x03

       Additional Descriptor

       bLength = 0x0c
       bDescriptorType = 0x24
       bDescriptorSubType = 0x02
        RAW dump:
        0x00 | 0x0c, 0x24, 0x02, 0x01, 0x01, 0x02, 0x00, 0x01,
        0x08 | 0x03, 0x00, 0x00, 0x00


       Additional Descriptor

       bLength = 0x08
       bDescriptorType = 0x24
       bDescriptorSubType = 0x06
        RAW dump:
        0x00 | 0x08, 0x24, 0x06, 0x03, 0x01, 0x01, 0x03, 0x00


       Additional Descriptor

       bLength = 0x09
       bDescriptorType = 0x24
       bDescriptorSubType = 0x03
        RAW dump:
        0x00 | 0x09, 0x24, 0x03, 0x02, 0x01, 0x01, 0x00, 0x03,
        0x08 | 0x00


     Interface 3
       bLength = 0x0009
       bDescriptorType = 0x0004
       bInterfaceNumber = 0x0003
       bAlternateSetting = 0x0000
       bNumEndpoints = 0x0000
       bInterfaceClass = 0x0001  <Audio device>
       bInterfaceSubClass = 0x0002
       bInterfaceProtocol = 0x0000
       iInterface = 0x0005  <USB Microphone>


     Interface 3 Alt 1
       bLength = 0x0009
       bDescriptorType = 0x0004
       bInterfaceNumber = 0x0003
       bAlternateSetting = 0x0001
       bNumEndpoints = 0x0001
       bInterfaceClass = 0x0001  <Audio device>
       bInterfaceSubClass = 0x0002
       bInterfaceProtocol = 0x0000
       iInterface = 0x0005  <USB Microphone>

       Additional Descriptor

       bLength = 0x07
       bDescriptorType = 0x24
       bDescriptorSubType = 0x01
        RAW dump:
        0x00 | 0x07, 0x24, 0x01, 0x02, 0x01, 0x01, 0x00


       Additional Descriptor

       bLength = 0x0b
       bDescriptorType = 0x24
       bDescriptorSubType = 0x02
        RAW dump:
        0x00 | 0x0b, 0x24, 0x02, 0x01, 0x01, 0x02, 0x10, 0x01,
        0x08 | 0x40, 0x1f, 0x00


      Endpoint 0
         bLength = 0x0009
         bDescriptorType = 0x0005
         bEndpointAddress = 0x0082  <IN>
         bmAttributes = 0x0001  <ISOCHRONOUS>
         wMaxPacketSize = 0x0100
         bInterval = 0x0004
         bRefresh = 0x0000
         bSynchAddress = 0x0000

       Additional Descriptor

       bLength = 0x07
       bDescriptorType = 0x25
       bDescriptorSubType = 0x01
        RAW dump:
        0x00 | 0x07, 0x25, 0x01, 0x01, 0x00, 0x00, 0x00



     Interface 3 Alt 2
       bLength = 0x0009
       bDescriptorType = 0x0004
       bInterfaceNumber = 0x0003
       bAlternateSetting = 0x0002
       bNumEndpoints = 0x0001
       bInterfaceClass = 0x0001  <Audio device>
       bInterfaceSubClass = 0x0002
       bInterfaceProtocol = 0x0000
       iInterface = 0x0005  <USB Microphone>

       Additional Descriptor

       bLength = 0x07
       bDescriptorType = 0x24
       bDescriptorSubType = 0x01
        RAW dump:
        0x00 | 0x07, 0x24, 0x01, 0x02, 0x01, 0x01, 0x00


       Additional Descriptor

       bLength = 0x0b
       bDescriptorType = 0x24
       bDescriptorSubType = 0x02
        RAW dump:
        0x00 | 0x0b, 0x24, 0x02, 0x01, 0x01, 0x02, 0x10, 0x01,
        0x08 | 0x80, 0x3e, 0x00


      Endpoint 0
         bLength = 0x0009
         bDescriptorType = 0x0005
         bEndpointAddress = 0x0082  <IN>
         bmAttributes = 0x0001  <ISOCHRONOUS>
         wMaxPacketSize = 0x0100
         bInterval = 0x0004
         bRefresh = 0x0000
         bSynchAddress = 0x0000

       Additional Descriptor

       bLength = 0x07
       bDescriptorType = 0x25
       bDescriptorSubType = 0x01
        RAW dump:
        0x00 | 0x07, 0x25, 0x01, 0x01, 0x00, 0x00, 0x00



     Interface 3 Alt 3
       bLength = 0x0009
       bDescriptorType = 0x0004
       bInterfaceNumber = 0x0003
       bAlternateSetting = 0x0003
       bNumEndpoints = 0x0001
       bInterfaceClass = 0x0001  <Audio device>
       bInterfaceSubClass = 0x0002
       bInterfaceProtocol = 0x0000
       iInterface = 0x0005  <USB Microphone>

       Additional Descriptor

       bLength = 0x07
       bDescriptorType = 0x24
       bDescriptorSubType = 0x01
        RAW dump:
        0x00 | 0x07, 0x24, 0x01, 0x02, 0x01, 0x01, 0x00


       Additional Descriptor

       bLength = 0x0b
       bDescriptorType = 0x24
       bDescriptorSubType = 0x02
        RAW dump:
        0x00 | 0x0b, 0x24, 0x02, 0x01, 0x01, 0x02, 0x10, 0x01,
        0x08 | 0x44, 0xac, 0x00


      Endpoint 0
         bLength = 0x0009
         bDescriptorType = 0x0005
         bEndpointAddress = 0x0082  <IN>
         bmAttributes = 0x0001  <ISOCHRONOUS>
         wMaxPacketSize = 0x0100
         bInterval = 0x0004
         bRefresh = 0x0000
         bSynchAddress = 0x0000

       Additional Descriptor

       bLength = 0x07
       bDescriptorType = 0x25
       bDescriptorSubType = 0x01
        RAW dump:
        0x00 | 0x07, 0x25, 0x01, 0x01, 0x00, 0x00, 0x00



     Interface 3 Alt 4
       bLength = 0x0009
       bDescriptorType = 0x0004
       bInterfaceNumber = 0x0003
       bAlternateSetting = 0x0004
       bNumEndpoints = 0x0001
       bInterfaceClass = 0x0001  <Audio device>
       bInterfaceSubClass = 0x0002
       bInterfaceProtocol = 0x0000
       iInterface = 0x0005  <USB Microphone>

       Additional Descriptor

       bLength = 0x07
       bDescriptorType = 0x24
       bDescriptorSubType = 0x01
        RAW dump:
        0x00 | 0x07, 0x24, 0x01, 0x02, 0x01, 0x01, 0x00


       Additional Descriptor

       bLength = 0x0b
       bDescriptorType = 0x24
       bDescriptorSubType = 0x02
        RAW dump:
        0x00 | 0x0b, 0x24, 0x02, 0x01, 0x01, 0x02, 0x10, 0x01,
        0x08 | 0x80, 0xbb, 0x00


      Endpoint 0
         bLength = 0x0009
         bDescriptorType = 0x0005
         bEndpointAddress = 0x0082  <IN>
         bmAttributes = 0x0001  <ISOCHRONOUS>
         wMaxPacketSize = 0x0100
         bInterval = 0x0004
         bRefresh = 0x0000
         bSynchAddress = 0x0000

       Additional Descriptor

       bLength = 0x07
       bDescriptorType = 0x25
       bDescriptorSubType = 0x01
        RAW dump:
        0x00 | 0x07, 0x25, 0x01, 0x01, 0x00, 0x00, 0x00


===============================

Both are connected to a USB hub, but I have tried connecting one 
directly to the computer, which is a pcengines APU3C4 btw. It did not 
make a difference.

What can I try to troubleshoot/debug this? Any more info needed?

Thanks! :)

Best regards,

Thomas Steen Rasmussen



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