Date: Fri, 05 Dec 2025 13:16:10 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 291424] uaudio: Logitech H390 - mixer misinterprets Feature Unit, sidetone and playback share same control Message-ID: <bug-291424-227@https.bugs.freebsd.org/bugzilla/>
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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: bugs@FreeBSD.org Reporter: freebsd@moov.de 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 -- You are receiving this mail because: You are the assignee for the bug.home | help
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