The microphone in the Plantronics C320-M headset will randomly
fail to initialize properly, at least when using Microsoft Teams.
Introducing a 20ms delay on the control messages appears to
resolve the issue.
Link: https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/issues/1065
Tested-by: Andreas Kempe <[email protected]>
Signed-off-by: John Ernberg <[email protected]>
---
Note: Microsoft Teams is the only application tests have been performed with
and no other kinds of investigations have been performed, like USB packet logging.
Originally reported as a possible PulseAudio issue, where it was suggested to
try a delay quirk in the kernel.
If other tests should be performed, please let me know which tests and I will try to do them.
All testing was done on 5.10, patch was then applied on sound.git master for submission
I did not register to the mailing lists, please keep me CC on any comments. Thanks!
sound/usb/quirks.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index d02dac5fcd40..a31b7db92b1e 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -1673,6 +1673,14 @@ void snd_usb_ctl_msg_quirk(struct usb_device *dev, unsigned int pipe,
&& (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
msleep(20);
+ /*
+ * Plantronics C320-M needs a delay to avoid random
+ * microhpone failures.
+ */
+ if (chip->usb_id == USB_ID(0x047f, 0xc025) &&
+ (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
+ msleep(20);
+
/* Zoom R16/24, many Logitech(at least H650e/H570e/BCC950),
* Jabra 550a, Kingston HyperX needs a tiny delay here,
* otherwise requests like get/set frequency return
--
2.30.0