Date: Sat, 20 Jun 2026 18:14:16 +0300 From: "Christos Margiolis" <christos@freebsd.org> To: "Roman Bogorodskiy" <novel@freebsd.org> Cc: <freebsd-current@freebsd.org> Subject: Re: Strange USB audio behavior Message-ID: <DJDZ3JN2R5SK.EMK16EOO2Z6D@freebsd.org> In-Reply-To: <ajV0cNGRCP9j-ZAi@tulp>
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On Fri Jun 19, 2026 at 7:55 PM EEST, Roman Bogorodskiy wrote: > Hi, > > For about a month I'm having a strange issue with the USB audio. I did > maybe 1 or 2 updates of -CURRENT during this time, but not sure when it > has started exactly as it does not show up immediately. > > The issue is: I have a set of USB speakers which I use as the main > output. > > After a few days of uptime (this time it was 3), the audio simply > disconnects. > > In dmesg it looks like: > > ugen0.4: <Generic Philips SPA 20/93> at usbus0 (disconnected) > umass0: at uhub0, port 9, addr 3 (disconnected) > da0 at umass-sim0 bus 0 scbus6 target 0 lun 0 > da0: <Generic Masstorage 1.00> s/n 20220701093627 detached > (da0:umass-sim0:0:0:0): Periph destroyed > umass0: detached > uaudio0: at uhub0, port 9, addr 3 (disconnected) > pcm2: detached > uaudio0: detached > usbhid1: at uhub0, port 9, addr 3 (disconnected) > hcons0: detached > hidbus1: detached > usbhid1: detached > > At this point, things appear quite strange. If I reconnect this device, > it's not detected anymore, complete silence. Moreover, if I connect > other USB devices, there are ignored by the system (no output in dmesg). > > The system has a builtin audio, but when this happens, switching to it > does not help: > >> cat /dev/sndstat > Installed devices: > pcm0: <Realtek ALC897 (Rear Analog)> (play/rec) default > pcm1: <Realtek ALC897 (Analog)> (play/rec) > No devices installed from userspace. > > But I get no audio when I try to test it with e.g. 'mpv -ao oss'. > > That could be a hardware issue, but feels more like a bug in the > USB/sound subsystem? Any ideas how to debug that? > > I'm running -CURRENT @ 0010c4b8a020dbeb81e61b71117d1caae9b044cc now. > > Roman This could very well a cable or port issue. It's definitely not a sound driver problem because the whole USB device disconnects, not just the audio parts. Christoshome | help
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