mic not working on JBL Quantum series USB headsets

[Alexander Tsoy]

В Вт, 20/07/2021 в 18:00 +0000, Jakub Fišer пишет:
> Hello Alsa people,
> 
> hope this is the right place to post.
> 
> My Quantum 800's microphone doesn't work and I found other reports
> suggesting
> this issue affects the whole Quantum product line.

This device consists of two interfaces. The first interface contains a
single playback endpoint and the second interface contains playback and
capture endpoints. So JBL Quantum probably needs a registration quirk
similar to Kingston HyperX devices. Please try the patch below:

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 8b8bee3c3dd6..f54331892d7a 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -1897,6 +1897,7 @@ static const struct registration_quirk registration_quirks[] = {
 	REG_QUIRK_ENTRY(0x0951, 0x16d8, 2),	/* Kingston HyperX AMP */
 	REG_QUIRK_ENTRY(0x0951, 0x16ed, 2),	/* Kingston HyperX Cloud Alpha S */
 	REG_QUIRK_ENTRY(0x0951, 0x16ea, 2),	/* Kingston HyperX Cloud Flight S */
+	REG_QUIRK_ENTRY(0x0ecb, 0x203e, 2),	/* JBL Quantum 800 */
 	{ 0 }					/* terminator */
 };