i'm having this issue on 18.10 as well, 4.18.0-13-generic with a
Logitech C310 (046d:081b). it's been an issue since 18.04 and older for
me; i can't remember when it worked without issue, but it did at some
point.
it appears this commit [0] is the cause as after restoring the specific
USB_QUIRK_RESET_RESUME line for my model and recompiling the kernel i
cannot reproduce the squeaky-voice issue. with the standard kernel i can
reliably reproduce it with Audacity by recording, stopping the
recording, then starting another recording - after ~3 "correct"
recordings the pitch changes.
with the recompiled kernel it appears the device is being "reset" for
each recording:
usb 2-1.6: reset high-speed USB device number 4 using ehci-pci
i do not see this when using the standard 4.18.0-13-generic kernel, so
i'm guessing this is what the quirk does and usb_interface_quirk_list in
quirks.c isn't catching my webcam. i believe there should be a match
based on the code; lsusb output includes the following Interface which
looks like it matches the call (USB_VENDOR_AND_INTERFACE_INFO(0x046d,
USB_CLASS_VIDEO, 1, 0)) since USB_CLASS_VIDEO is 0x0e which matches the
bInterfaceClass, and subclass/protocol also match. note that this is not
the first interface in the lsusb output, not sure if that matters.
Bus 002 Device 004: ID 046d:081b Logitech, Inc. Webcam C310
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 239 Miscellaneous Device
bDeviceSubClass 2 ?
bDeviceProtocol 1 Interface Association
...
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 1 Video Control
bInterfaceProtocol 0
iInterface 0
...
please let me know if there is anything else i can provide to help debug
this issue.
[0]
https://github.com/torvalds/linux/commit/e387ef5c47ddeaeaa3cbdc54424cdb7a28dae2c0
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https://bugs.launchpad.net/bugs/843431
Title:
Logitech camera microphone does not work / makes "chipmunk" sound
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