LinuxQuestions.org - Microphone recognised as disk!?

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Microphone recognised as disk!?

I need to convince my system to see my new microphone as a microphone, and only that. I'm on Slackware64-15.0. Details are below.

This concerns ebay item number 125922022158
Long ebay.ie Link

This seems a mighty strange device. ~It's a usb microphone on a tripod with ever changing led colours, but it also identifies as a disk! It's brand name is BLOW. The label is in Polish, and gives the website: https://www.protech.com.pl/

It's not in yesterday's usb.ids. Here's what I can find on it.

Code:

dec@Ebony:~$sudo lsusb |grep Jieli

Bus 003 Device 003: ID 4c4a:4155 Jieli Technology UACDemoV1.0



Zoom actually gives the fullest description:"UACDemoV1.0 Audio-Default Audio Device"



dec@Ebony:~$lsblk |grep sdb

sdb          8:16  1    0B  0 disk 

[sdb only appeared when I plugged it in. the '0B' size is also somewhat odd.]



dec@Ebony:~$ls -l /dev/disk/by-id |grep usb-BR25

lrwxrwxrwx 1 root root  9 Feb 23 09:09 usb-BR25_UDISK_4150325431313106-0:0 -> ../../sdb



dec@Ebony:~$ls -l /dev/disk/by-path            

total 0

lrwxrwxrwx 1 root root 9 Feb 23 09:09 pci-0000:0a:00.3-usb-0:2.1:1.0-scsi-0:0:0:0 -> ../../sdb

It doesn't feature in the UUID directories. Now my fstab has /dev/nvme0n1* & /dev/sda*, but a UUIID for the external disk, so it isn't a disk crisis.

But on the PC is a failed webcam/mic that I'm replacing. The mic works only if you yell at it from 3 inches. The camera turns my pale sickly-looking self into a face painted red LED, with all background colours appropriately shaded. Now when I replace that camera, whether the usb microphone module continues to load for this split-personality device is a very open question.

What I'd like is some clever tricks or options to make sure the microphone works, and to nobble it as a disk.

at first you can cut that ebay link at the first question mark. https://www.ebay.ie/itm/125922022158? (use without that)
Otherwise you ought to create an udev rule for that device.
start somewhere here: https://unix.stackexchange.com/quest...ux-environment

Er, yes, and thank you https://www.ebay.ie/itm/125922022158 works just fine.

That stackexchange link quickly deteriorates into nagging and corrections. I dislike stackexchange. You go to the trouble of answering a problem. Nobody says 'thanks' but they go correcting you on the way you answered it.

I get the idea, though. One rule to disable everything on that usb.id, and another to allow the one specific usage you want.

I'll have a go at that when I feel able for a cryptic crossword puzzle. I never made friends with udev, so this will be a first.

This is the relevant snippet from dmesg

Code:

dec@Ebony:~$sudo dmesg |tail -n 12

[  80.191300] usb 3-2.2: New USB device found, idVendor=4c4a, idProduct=4155, bcdDevice= 1.00

[  80.191306] usb 3-2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3

[  80.191308] usb 3-2.2: Product: UACDemoV1.0

[  80.191309] usb 3-2.2: Manufacturer: Jieli Technology

[  80.191311] usb 3-2.2: SerialNumber: 4150325431313106

[  80.193202] usb-storage 3-2.2:1.0: USB Mass Storage device detected

[  80.193438] scsi host6: usb-storage 3-2.2:1.0

[  81.249379] scsi 6:0:0:0: Direct-Access    BR25    UDISK            1.00 PQ: 0 ANSI: 2

[  81.249997] sd 6:0:0:0: [sdb] Media removed, stopped polling

[  81.250770] sd 6:0:0:0: [sdb] Attached SCSI removable disk

[  164.396533] usb 3-2.1: reset high-speed USB device number 3 using xhci_hcd

[  185.723444] fuse: init (API version 7.34)

Note to self: Never again buy a clever microphone. You don't know whose brains they are.

Quote:

Originally Posted by pan64 (Post 6485390)

I've been through this stackexchange link. This seems to disallow all devices, then enable approved ones. Fine on servers. That's not acceptable for me, as a great variety of usb devices are used here. I can't go cobbling up some udev rule any time I want to allow a device. I have this one device that thinks it's a disk, or excites that reaction. Is there another way to do this? Edit usb.ids perhaps? Associate a module with it? Anything?

I guess you need to disable the non-existent disk only.

Quote:

Originally Posted by pan64 (Post 6485751)

I guess you need to disable the non-existent disk only.

Exactly. How do I do that? It's loading the usb-storage and seems to think it's a disk with the storage removed :scratch:. I even saw a comment to that effect. This is from /var/log/messages:

Code:

Feb 22 09:42:06 Ebony kernel: usb 3-2.1: new full-speed USB device number 5 using xhci_hcd

Feb 22 09:42:06 Ebony kernel: usb 3-2.1: New USB device found, idVendor=4c4a, idProduct=4155, bcdDevice= 1.00

Feb 22 09:42:06 Ebony kernel: usb 3-2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3

Feb 22 09:42:06 Ebony kernel: usb 3-2.1: Product: UACDemoV1.0

Feb 22 09:42:06 Ebony kernel: usb 3-2.1: Manufacturer: Jieli Technology

Feb 22 09:42:06 Ebony kernel: usb 3-2.1: SerialNumber: 4150325431313106

Feb 22 09:42:06 Ebony mtp-probe: checking bus 3, device 5: "/sys/devices/pci0000:00/0000:00:08.1/0000:0a:00.3/usb3/3-2/3-2.1" 

Feb 22 09:42:06 Ebony mtp-probe: bus: 3, device: 5 was not an MTP device 

Feb 22 09:42:06 Ebony kernel: usb-storage 3-2.1:1.0: USB Mass Storage device detected

Feb 22 09:42:06 Ebony kernel: scsi host6: usb-storage 3-2.1:1.0

Feb 22 09:42:06 Ebony kernel: usbcore: registered new interface driver usb-storage

Feb 22 09:42:06 Ebony kernel: usbcore: registered new interface driver uas

Feb 22 09:42:07 Ebony kernel: scsi 6:0:0:0: Direct-Access    BR25    UDISK            1.00 PQ: 0 ANSI: 2

Feb 22 09:42:07 Ebony kernel: sd 6:0:0:0: [sdb] Media removed, stopped polling

Feb 22 09:42:07 Ebony kernel: sd 6:0:0:0: [sdb] Attached SCSI removable disk

BTW, MTP = Media Transfer Protocol. I've a thing about unknown acronyms. Is there some way I can say "Actually, that 4c4a:4155 device you might meet isn't a disk, but a microphone?"

This is humiliating.

I tried zoom today, and the microphone couldn't be heard on zoom. OTOH, when I used (spit!) windows 11, it worked fine, and is not recognized as a disk :mad: :mad:. I have to report this thing to linux-usb.org, which has a bot reading it's email. How does that work?

What's more, I couldn't change volume. I boosted it to 150% and it got no louder Is there anything I can pull to stop the kernel assigning usb-storage.ko to a microphone? As it's a usb device, I have the usb id.

Let's get some details. Try

lsusb -v 003:003

Quote:

Originally Posted by smallpond (Post 6486244)

Let's get some details. Try

lsusb -v 003:003

Thanks for your reply. It took a few minutes to figure out what you were looking for. Is this it? It's certainly more than "a few details"

Code:

dec@Ebony:~$lsusb -v -s 003:005



Bus 003 Device 005: ID 4c4a:4155 Jieli Technology UACDemoV1.0

Couldn't open device, some information will be missing

Device Descriptor:

  bLength                18

  bDescriptorType        1

  bcdUSB              1.10

  bDeviceClass            0 

  bDeviceSubClass        0 

  bDeviceProtocol        0 

  bMaxPacketSize0        64

  idVendor          0x4c4a 

  idProduct          0x4155 

  bcdDevice            1.00

  iManufacturer          1 Jieli Technology

  iProduct                2 UACDemoV1.0

  iSerial                3 4150325431313106

  bNumConfigurations      1

  Configuration Descriptor:

    bLength                9

    bDescriptorType        2

    wTotalLength      0x008b

    bNumInterfaces          3

    bConfigurationValue    1

    iConfiguration          0 

    bmAttributes        0x80

      (Bus Powered)

    MaxPower              100mA

    Interface Descriptor:

      bLength                9

      bDescriptorType        4

      bInterfaceNumber        0

      bAlternateSetting      0

      bNumEndpoints          2

      bInterfaceClass        8 Mass Storage

      bInterfaceSubClass      6 SCSI

      bInterfaceProtocol    80 Bulk-Only

      iInterface              0 

      Endpoint Descriptor:

        bLength                7

        bDescriptorType        5

        bEndpointAddress    0x81  EP 1 IN

        bmAttributes            2

          Transfer Type            Bulk

          Synch Type              None

          Usage Type              Data

        wMaxPacketSize    0x0040  1x 64 bytes

        bInterval              1

      Endpoint Descriptor:

        bLength                7

        bDescriptorType        5

        bEndpointAddress    0x01  EP 1 OUT

        bmAttributes            2

          Transfer Type            Bulk

          Synch Type              None

          Usage Type              Data

        wMaxPacketSize    0x0040  1x 64 bytes

        bInterval              1

    Interface Descriptor:

      bLength                9

      bDescriptorType        4

      bInterfaceNumber        1

      bAlternateSetting      0

      bNumEndpoints          0

      bInterfaceClass        1 Audio

      bInterfaceSubClass      1 Control Device

      bInterfaceProtocol      0 

      iInterface              9 

      AudioControl Interface Descriptor:

        bLength                9

        bDescriptorType        36

        bDescriptorSubtype      1 (HEADER)

        bcdADC              1.00

        wTotalLength      0x0027

        bInCollection          1

        baInterfaceNr(0)        2

      AudioControl Interface Descriptor:

        bLength                12

        bDescriptorType        36

        bDescriptorSubtype      2 (INPUT_TERMINAL)

        bTerminalID            4

        wTerminalType      0x0201 Microphone

        bAssocTerminal          0

        bNrChannels            1

        wChannelConfig    0x0000

        iChannelNames          0 

        iTerminal              0 

      AudioControl Interface Descriptor:

        bLength                9

        bDescriptorType        36

        bDescriptorSubtype      3 (OUTPUT_TERMINAL)

        bTerminalID            6

        wTerminalType      0x0101 USB Streaming

        bAssocTerminal          2

        bSourceID              7

        iTerminal              0 

      AudioControl Interface Descriptor:

        bLength                7

        bDescriptorType        36

        bDescriptorSubtype      5 (SELECTOR_UNIT)

        bUnitID                7

        bNrInPins              1

        baSourceID(0)          5

        iSelector              0 

      AudioControl Interface Descriptor:

        bLength                9

        bDescriptorType        36

        bDescriptorSubtype      6 (FEATURE_UNIT)

        bUnitID                5

        bSourceID              4

        bControlSize            1

        bmaControls(0)      0x43

          Mute Control

          Volume Control

          Automatic Gain Control

        bmaControls(1)      0x00

        iFeature                0 

    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          6

        bDelay                  1 frames

        wFormatTag        0x0001 PCM

      AudioStreaming Interface Descriptor:

        bLength                11

        bDescriptorType        36

        bDescriptorSubtype      2 (FORMAT_TYPE)

        bFormatType            1 (FORMAT_TYPE_I)

        bNrChannels            1

        bSubframeSize          2

        bBitResolution        16

        bSamFreqType            1 Discrete

        tSamFreq[ 0]        48000

      Endpoint Descriptor:

        bLength                9

        bDescriptorType        5

        bEndpointAddress    0x83  EP 3 IN

        bmAttributes            5

          Transfer Type            Isochronous

          Synch Type              Asynchronous

          Usage Type              Data

        wMaxPacketSize    0x0060  1x 96 bytes

        bInterval              1

        bRefresh                0

        bSynchAddress          0

        AudioStreaming Endpoint Descriptor:

          bLength                7

          bDescriptorType        37

          bDescriptorSubtype      1 (EP_GENERAL)

          bmAttributes        0x00

          bLockDelayUnits        0 Undefined

          wLockDelay        0x0000

dec@Ebony:~$

For the record, it's alone in it's usb port, no hubs or anything and no usb storage devices are in the pc at all. I can see it's clearly saying it's a mass storage device, and then saying it's a microphone. So that diagnostic hit the nail on the head.

It seems clear that linux is reading the first Interface Descriptor, and windows the second one.

Your microphone appears to be supported by Alsa sound as of 2022
https://www.alsa-project.org/db/?f=1...a73d860bf8e5c5

It is also not purely a microphone, from your lsusb it appears to be an entire (simple) sound card, with sub-devices for 2 sound channels and an onboard mixer, and onboard audio compression to offload some of the work of streaming. A web search suggests it may also have bluetooth receiving capability.

The "mass storage" descriptor appears possibly related to it transferring compressed audio in frames.

Quote:

Originally Posted by mw.decavia (Post 6486279)

Thanks for your reply. I saw it there in your link. I don't know if we're talking about the same device. It doesn't seem to have support from alsa+pulse of 2024! It adds an unnecessary disk. The sales ad boasts none of the features you describe. If definitely doesn't provide a mixer. I can't even adjust the insufficient volume under pulse.

My model may be a cut down version. Mind you, if I met a microphone with all those bells & whistles, I wouldn't buy it.