[sf-lug] USB mic not working under 14.04

[Ken Shaffer]

Watch the dmesg output as you plug the mic in.  If nothing shows, then it's
a hardware problem -- cable or port assuming the mic itself works as you
say. The dmesg output is of interest here.
Ken

On Wed, Sep 5, 2018 at 8:06 PM Rick Moen <rick at linuxmafia.com> wrote:

> Quoting Christian Einfeldt (einfeldt at gmail.com):
>
> > Hi,
> >
> > I recently picked up a second-hand Macmice Miceflex [...]
>
> Correct spelling:  'MicFlex'.
>
> Lordie, Christian.  Haven't you figured out, after all these years, that
> careless typos in your diagnostic data can prevent people from helping you?
>
>
> > [...] USB desktop external microphone and have been trying to get it
> > working under Lubuntu 14.04.  It seems that my system is not seeing
> > it.  The mic is known good, because a friend gave it too me and was
> > using it with a Windows machine.
> >
> > me at mycomputer:~$ lsusb
> > Bus 002 Device 004: ID 413c:2003 Dell Computer Corp. Keyboard
> > Bus 002 Device 003: ID 046d:c00e Logitech, Inc. M-BJ58/M-BJ69 Optical
> Wheel
> > Mouse
> > Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
> > Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> > Bus 001 Device 003: ID 0d8c:000c C-Media Electronics, Inc. Audio Adapter
> > Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
> > Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> > me at mycomputer:~$
>
>
> So, I cannot help noticing that lsusb doesn't appear to list the device
> at all, not even as 'Unknown USB x.xx Device (class x)', which would be
> the default if the USB controller chip inventoried the device but then
> the kernel failed to find an entry for the probed Vendor ID:Device ID
> hexadecimal digits in /sys/kernel/debug/usb/devices .
>
> Therefore, by your account, the USB controller chip is not inventorying
> the microphone.  Which suggests to me that you have some sort of
> non-Linux problem, e.g., a hardware-level one.
>
> > I plugged the mic into a notebook running Lubuntu 18.04, and it didn't
> see
> > the mic either:
> >
> > me at laptop:~$ lsusb
> > Bus 002 Device 002: ID 5986:0299 Acer, Inc
> > Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> > Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> > Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> > Bus 003 Device 002: ID 04ca:2007 Lite-On Technology Corp.
> > Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> > Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> > Bus 005 Device 002: ID 0d8c:000c C-Media Electronics, Inc. Audio Adapter
> > Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> > me at laptop:~$
>
> Yeah, as I said.
>
> Given that your USB controller chip apparently isn't even seeing the
> hardware item, I'm unclear on how you think a Linux User Group mailing
> list can solve _that_ problem.
>
> As far as hardware-level USB reliabilitiy problems (which are, frankly,
> legion), start by making damned sure you plug the device directly into a
> system USB port and do _not_ try to rely on a 'USB hub'.  If lsusb
> continues to not even show the existence of an unknown USB device when
> you plug it directly into a main-system USB port, try the other
> main-system USB ports.  If that still produces not even low-level (e.g.,
> lsusb) recognition of the device's existence, I don't know what to tell
> you except that your assertion that the device is known-good is subject
> to question.
>
> Please note that your choice of Linux distribution is not particularly
> relevant to this problem.  Your _kernel_ is relevant, because that
> determines what vintage of usb.ids database it has.
>
> Here is the very latest USB IDs database release, from the middle of
> last month: http://www.linux-usb.org/usb.ids   I see nothing by the
> indicated name, but of course they may well be OEMing something made by
> a different company.  If you want to produce some useful information,
> get this device's USB ID, e.g., on the MS-Windows installation of your
> 'friend'.  Assuming, of course, the thing is still working.
>
>
>
>
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