https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291424
Bug ID: 291424
Summary: uaudio: Logitech H390 - mixer misinterprets Feature
Unit, sidetone and playback share same control
Product: Base System
Version: 14.3-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
On FreeBSD 14.3, the Logitech H390 USB headset exposes an incorrect mixer
topology via the uaudio(4) driver.
The driver maps the headset's sidetone/monitoring Feature Unit and the
playback/PCM output Feature Unit to the same mixer control.
As a result:
- Increasing the control dev.pcm.X.mixer.vol_2_1 enables sidetone (microphone
monitoring) and changes playback output.
- Setting this control to its minimum (e.g. -10496) disables sidetone and
completely disables audio playback on the device.
- This makes the device either unusable due to strong acoustic feedback
(sidetone routed directly to headphones) or silent (playback path disabled).
Linux and Windows handle the device correctly: sidetone is zero or disabled by
default, and playback works independently.
Relevant sysctl changes when adjusting the problematic mixer node:
-dev.pcm.7.mixer.vol_2_1.val: -10496
+dev.pcm.7.mixer.vol_2_1.val: -6508
Setting the value back to minimum eliminates feedback but also removes playback
entirely.
$ mixer
pcm7:mixer: <Logi USB Headset Logi USB Headset> on uaudio1 (play/rec) (default)
vol = 0.64:0.64 pbk
pcm = 0.00:0.00 pbk
mic = 0.00:0.00 pbk
$ usbconfig -d ugen0.6
ugen0.6: <H390 headset with microphone Logitech, Inc.> at usbus0, cfg=0 md=HOST
spd=FULL (12Mbps) pwr=ON (100mA)
$ grep Logi /dev/sndstat
pcm7: <Logi USB Headset Logi USB Headset> on uaudio1 (1p:0v/1r:0v) default
$ sysctl dev.pcm.7
dev.pcm.7.feedback_rate: 0
dev.pcm.7.mixer.mute_6.desc:
dev.pcm.7.mixer.mute_6.max: 1
dev.pcm.7.mixer.mute_6.min: 0
dev.pcm.7.mixer.mute_6.val: 0
dev.pcm.7.mixer.vol_5.desc:
dev.pcm.7.mixer.vol_5.max: 0
dev.pcm.7.mixer.vol_5.min: -3840
dev.pcm.7.mixer.vol_5.val: -1536
dev.pcm.7.mixer.(null)_4.desc:
dev.pcm.7.mixer.(null)_4.max: 1
dev.pcm.7.mixer.(null)_4.min: 0
dev.pcm.7.mixer.(null)_4.val: 0
dev.pcm.7.mixer.mute_3.desc:
dev.pcm.7.mixer.mute_3.max: 1
dev.pcm.7.mixer.mute_3.min: 0
dev.pcm.7.mixer.mute_3.val: 0
dev.pcm.7.mixer.vol_2_1.desc:
dev.pcm.7.mixer.vol_2_1.max: 0
dev.pcm.7.mixer.vol_2_1.min: -10496
dev.pcm.7.mixer.vol_2_1.val: -10496
dev.pcm.7.mixer.vol_2_0.desc:
dev.pcm.7.mixer.vol_2_0.max: 0
dev.pcm.7.mixer.vol_2_0.min: -10496
dev.pcm.7.mixer.vol_2_0.val: -1536
dev.pcm.7.mixer.mute_1.desc:
dev.pcm.7.mixer.mute_1.max: 1
dev.pcm.7.mixer.mute_1.min: 0
dev.pcm.7.mixer.mute_1.val: 0
dev.pcm.7.mixer.vol_0.desc:
dev.pcm.7.mixer.vol_0.max: 2816
dev.pcm.7.mixer.vol_0.min: -1536
dev.pcm.7.mixer.vol_0.val: -1536
dev.pcm.7.mode: 7
dev.pcm.7.bitperfect: 0
dev.pcm.7.buffersize: 0
dev.pcm.7.rec.vchanformat: s16le:2.0
dev.pcm.7.rec.vchanrate: 48000
dev.pcm.7.rec.vchanmode: fixed
dev.pcm.7.rec.vchans: 1
dev.pcm.7.play.vchanformat: s16le:2.0
dev.pcm.7.play.vchanrate: 48000
dev.pcm.7.play.vchanmode: fixed
dev.pcm.7.play.vchans: 1
dev.pcm.7.hwvol_mixer: vol
dev.pcm.7.hwvol_step: 5
dev.pcm.7.%iommu:
dev.pcm.7.%parent: uaudio1
dev.pcm.7.%pnpinfo:
dev.pcm.7.%location:
dev.pcm.7.%driver: pcm
dev.pcm.7.%desc: Logi USB Headset Logi USB Headset
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