Date: Sat, 03 Dec 2022 14:09:08 +0000 From: bugzilla-noreply@freebsd.org To: usb@FreeBSD.org Subject: [Bug 268136] [snd_uaudio] Distorted audio from MOTU M4 USB interface Message-ID: <bug-268136-19105@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D268136 Bug ID: 268136 Summary: [snd_uaudio] Distorted audio from MOTU M4 USB interface Product: Base System Version: 13.1-RELEASE Hardware: amd64 OS: Any Status: New Severity: Affects Only Me Priority: --- Component: usb Assignee: usb@FreeBSD.org Reporter: markus.buretorp@gmail.com All audio coming from the MOTU M4 audio interface is distorted. There is a = high frequency buzz on top of all sounds, both sounds generated by FreeBSD over = USB and external analog inputs. I've tried all a lot of sysctl combinations but= no difference at all. As I said this affects all analog inputs with direct monitoring. For example with the computer OFF I can connect an external signal generator to one ana= log input and hear it. Once I boot FreeBSD and do something audio related like opening a YouTube tab it starts distorting the external signal as well as YouTube. Now if I close the YouTube tab the external signal is clean again = and the distortion is gone. My guess is that something with the uaudio initialization messes up the aud= io interface internals. POTENTIAL FIX: This has nothing to do with PulseAudio as it happens on a base installation with no pkgs. BUT the only fix I've found is to either start or kill the PulseAudio daemon with 'pulseaudio -D' or 'pulseaudio -k'. So something in = the PulseAudio init/shutdown code is pokes something which fixes the audio. Note that this has to be repeated every time audio is reinitialized, so if you c= lose YouTube and later open it again you would have to do the PulseAudio trick again. Maybe stepping through the PA init code to find what function call fixes it would help. INFO: root@marcus:~ # freebsd-version 13.1-RELEASE-p5 root@marcus:~ # dmesg | grep -i audio hdaa0: <NVIDIA (0x0099) Audio Function Group> at nid 1 on hdacc0 uaudio0 on uhub1 uaudio0: <MOTU M4, class 239/2, rev 2.00/2.02, addr 4> on usbus3 uaudio0: Play[0]: 192000 Hz, 4 ch, 32-bit S-LE PCM format, 2x8ms buffer. uaudio0: Play[0]: 176400 Hz, 4 ch, 32-bit S-LE PCM format, 2x8ms buffer. uaudio0: Play[0]: 96000 Hz, 4 ch, 32-bit S-LE PCM format, 2x8ms buffer. uaudio0: Play[0]: 88200 Hz, 4 ch, 32-bit S-LE PCM format, 2x8ms buffer. uaudio0: Play[0]: 48000 Hz, 4 ch, 32-bit S-LE PCM format, 2x8ms buffer. uaudio0: Play[0]: 44100 Hz, 4 ch, 32-bit S-LE PCM format, 2x8ms buffer. uaudio0: Record[0]: 192000 Hz, 4 ch, 32-bit S-LE PCM format, 2x8ms buffer. uaudio0: Record[0]: 176400 Hz, 4 ch, 32-bit S-LE PCM format, 2x8ms buffer. uaudio0: Record[0]: 96000 Hz, 4 ch, 32-bit S-LE PCM format, 2x8ms buffer. uaudio0: Record[0]: 88200 Hz, 4 ch, 32-bit S-LE PCM format, 2x8ms buffer. uaudio0: Record[0]: 48000 Hz, 4 ch, 32-bit S-LE PCM format, 2x8ms buffer. uaudio0: Record[0]: 44100 Hz, 4 ch, 32-bit S-LE PCM format, 2x8ms buffer. uaudio0: MIDI sequencer. pcm4: <USB audio> on uaudio0 uaudio0: No HID volume keys found. root@marcus:~ # sysctl hw.snd hw.snd.maxautovchans: 16 hw.snd.default_unit: 4 hw.snd.version: 2009061500/amd64 hw.snd.default_auto: 1 hw.snd.verbose: 0 hw.snd.vpc_mixer_bypass: 1 hw.snd.feeder_rate_quality: 1 hw.snd.feeder_rate_round: 25 hw.snd.feeder_rate_max: 2016000 hw.snd.feeder_rate_min: 1 hw.snd.feeder_rate_polyphase_max: 183040 hw.snd.feeder_rate_presets: 100:8:0.85 100:36:0.92 100:164:0.97 hw.snd.feeder_eq_exact_rate: 0 hw.snd.feeder_eq_presets: PEQ:16000,0.2500,62,0.2500:-9,9,1.0:44100,48000,88200,96000,176400,192000 hw.snd.basename_clone: 1 hw.snd.compat_linux_mmap: 0 hw.snd.syncdelay: -1 hw.snd.usefrags: 0 hw.snd.vpc_reset: 0 hw.snd.vpc_0db: 45 hw.snd.vpc_autoreset: 1 hw.snd.timeout: 5 hw.snd.latency_profile: 1 hw.snd.latency: 2 hw.snd.report_soft_matrix: 1 hw.snd.report_soft_formats: 1 root@marcus:~ # sysctl hw.usb.uaudio hw.usb.uaudio.debug: 0 hw.usb.uaudio.buffer_ms: 8 hw.usb.uaudio.default_channels: 0 hw.usb.uaudio.default_bits: 32 hw.usb.uaudio.default_rate: 0 hw.usb.uaudio.handle_hid: 1 --=20 You are receiving this mail because: You are the assignee for the bug.=
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