Date: Sun, 13 Sep 2020 10:21:52 +0100 From: Graham Perrin <grahamperrin@gmail.com> To: FreeBSD CURRENT <freebsd-current@freebsd.org>, FreeBSD questions <freebsd-questions@freebsd.org> Subject: USB sound devices with FreeBSD-CURRENT Message-ID: <9551111b-5dfb-c42b-6f58-81f6c8b8bbd1@gmail.com>
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I'm confused about use of USB devices for audio (primarily with Firefox and Chromium). Re: <https://forums.freebsd.org/threads/switching-dsp-devices-on-the-fly.69773/#post-419100>; under 'switching dsp-devices on-the-fly' > … hw.snd.default_unit to "0", which will automatically assign > hw.snd.default_unit to the newly-attached devices. …" – so in sysctl.conf I experimented with: hw.snd.default_unit="0" – and after signing in (to KDE Plasma) I attach first the USB microphone (Alctron USB700 Alctron USB700) then a USB headset (SteelSeries SteelSeries Siberia 350). virtual_oss and sndiod are enabled. With this setup, as far as I can tell: 1. Chromium simply does not play AV content e.g. <https://www.ted.com/talks/james_geary_metaphorically_speaking>; – after a click to play, there's a moment of visual motion but no playback 2. if Firefox media.cubeb.backend set to oss then behaviour is the same as Chromium 3. if Firefox media.cubeb.backend is not set (audio backend defaults to pulse-rust) then playback occurs through IDT 92HD81B1X (Analog) – not USB. ---- root@momh167-gjp4-8570p:~ # date ; uname -v Sun Sep 13 08:25:39 BST 2020 FreeBSD 13.0-CURRENT #64 r365364: Sun Sep 6 01:38:18 BST 2020 root@momh167-gjp4-8570p:/usr/obj/usr/src/amd64.amd64/sys/GENERIC-NODEBUG root@momh167-gjp4-8570p:~ # service virtual_oss start ; service sndiod start ; service virtual_oss status ; service sndiod status ; cat /dev/sndstat ; grep " -f /dev/" /usr/local/etc/rc.d/virtual_oss | grep -v \# ; sysctl hw.snd.default_unit Starting Virtual OSS config dsp ...hw.snd.basename_clone: 0 -> 0 done Starting sndiod. virtual_oss is running as pid 5688. sndiod is running as pid 5697. Installed devices: pcm0: <ATI R6xx (HDMI)> (play) default pcm1: <IDT 92HD81B1X (Analog 2.0+HP/2.0)> (play/rec) pcm2: <IDT 92HD81B1X (Analog)> (play/rec) pcm3: <USB audio> (rec) pcm4: <USB audio> (play/rec) Installed devices from userspace: dsp: <Virtual OSS> (play/rec) -f /dev/dsp0 \ hw.snd.default_unit: 0 root@momh167-gjp4-8570p:~ # ---- In addition, as far as I can tell: 4. if I remove then reconnect the two USB devices, the devices are no longer driven * neither device 'lights up' * playback in Firefox (with oss) and Chromium is visible, but no longer audible on any device * playback in Firefox (with puse-rust) is visible, but no longer audible on any device. ---- root@momh167-gjp4-8570p:~ # grep Alctron /var/log/messages Sep 13 06:17:08 momh167-gjp4-8570p kernel: ugen0.7: <Alctron USB700 Alctron USB700> at usbus0 (disconnected) Sep 13 06:19:07 momh167-gjp4-8570p kernel: ugen0.3: <Alctron USB700 Alctron USB700> at usbus0 Sep 13 06:19:07 momh167-gjp4-8570p kernel: uaudio0: <Alctron USB700 Alctron USB700, class 0/0, rev 1.10/1.00, addr 11> on usbus0 Sep 13 06:19:07 momh167-gjp4-8570p kernel: uhid1: <Alctron USB700 Alctron USB700, class 0/0, rev 1.10/1.00, addr 11> on usbus0 Sep 13 09:13:08 momh167-gjp4-8570p kernel: ugen0.5: <Alctron USB700 Alctron USB700> at usbus0 Sep 13 09:13:08 momh167-gjp4-8570p kernel: uaudio1: <Alctron USB700 Alctron USB700, class 0/0, rev 1.10/1.00, addr 4> on usbus0 Sep 13 09:13:08 momh167-gjp4-8570p kernel: uhid0: <Alctron USB700 Alctron USB700, class 0/0, rev 1.10/1.00, addr 4> on usbus0 Sep 13 09:48:51 momh167-gjp4-8570p kernel: ugen0.5: <Alctron USB700 Alctron USB700> at usbus0 (disconnected) root@momh167-gjp4-8570p:~ # grep SteelSeries /var/log/messages Sep 13 06:17:22 momh167-gjp4-8570p kernel: ugen0.6: <SteelSeries SteelSeries Siberia 350> at usbus0 (disconnected) Sep 13 06:17:51 momh167-gjp4-8570p kernel: ugen0.6: <SteelSeries SteelSeries Siberia 350> at usbus0 Sep 13 06:17:51 momh167-gjp4-8570p kernel: uaudio0: <SteelSeries SteelSeries Siberia 350, class 0/0, rev 1.10/2.08, addr 10> on usbus0 Sep 13 06:19:00 momh167-gjp4-8570p kernel: ugen0.6: <SteelSeries SteelSeries Siberia 350> at usbus0 (disconnected) Sep 13 06:19:12 momh167-gjp4-8570p kernel: ugen0.7: <SteelSeries SteelSeries Siberia 350> at usbus0 Sep 13 06:19:12 momh167-gjp4-8570p kernel: uaudio1: <SteelSeries SteelSeries Siberia 350, class 0/0, rev 1.10/2.08, addr 13> on usbus0 Sep 13 09:13:08 momh167-gjp4-8570p kernel: ugen0.4: <SteelSeries SteelSeries Siberia 350> at usbus0 Sep 13 09:13:08 momh167-gjp4-8570p kernel: uaudio0: <SteelSeries SteelSeries Siberia 350, class 0/0, rev 1.10/2.08, addr 3> on usbus0 root@momh167-gjp4-8570p:~ # tail /var/log/messages Sep 13 10:11:39 momh167-gjp4-8570p kernel: pcm4: unregister: mixer busy Sep 13 10:11:39 momh167-gjp4-8570p kernel: pcm4: Waiting for sound application to exit! Sep 13 10:11:39 momh167-gjp4-8570p kernel: pcm4: unregister: mixer busy Sep 13 10:11:39 momh167-gjp4-8570p kernel: pcm4: Waiting for sound application to exit! Sep 13 10:11:39 momh167-gjp4-8570p kernel: pcm4: unregister: mixer busy Sep 13 10:11:39 momh167-gjp4-8570p kernel: pcm4: Waiting for sound application to exit! Sep 13 10:11:39 momh167-gjp4-8570p kernel: pcm4: unregister: mixer busy Sep 13 10:11:39 momh167-gjp4-8570p kernel: pcm4: Waiting for sound application to exit! Sep 13 10:11:39 momh167-gjp4-8570p kernel: pcm4: unregister: mixer busy Sep 13 10:11:39 momh167-gjp4-8570p kernel: pcm4: Waiting for sound application to exit! root@momh167-gjp4-8570p:~ # ---- Clearly I'm doing something wrong. If on-the-fly use of USB audio devices is not possible, then must I keep the devices connected whilst I'm signed in to the desktop environment?
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