On Sat, 20 Sep 2025 09:05:35 +0200, Alexandre Ratchov <[email protected]> wrote: > > On Wed, Sep 17, 2025 at 08:38:48PM +0200, Rafael Sadowski wrote: > > On Tue Sep 16, 2025 at 03:13:34PM +0200, Rafael Sadowski wrote: > > > As you can see below, I have usb0, usb2 and usb3. USB3 is the USB > > > hub from my "Dell UltraSharp 32 4K Thunderbolt Hub Monitor > > > U3225QE". I have also the "DELL DELL Slim Soundbar SB522A" connected to > > > it. > > > > > > When I run "sndioctl server.device=1", I can hear great sound > > > through the soundbar (YouTube continues to run smoothly with > > > sound). However, all my other USB devices connected to USB3 are > > > dead. No mouse, no keyboard. When I unplug them and plug them into > > > USB1/2, they work. USB3 no longer responds. > > > > > > Anyone have any ideas? > > > > > > > Workaround. I put the Soundbar on /dev/usb3 and set sndiod flags > > -f rsnd/1 at boot-time. It works but I see in the dmesg: > > > > uaudio never really worked well behind a usb hub. Right now, I use the > same workaround for similar problems. Until this get fixed, I'd > suggest dedicating a port to the audio device. >
Wow. I mainly use my BT headphones via uaudio via USB hub in the external display and it works quite good. But USB audio embeded in the external screen may detach for a second or so. Also, when I load USB bus by 4K webcam, I may trigger a symptopms vers closer to that Rafael describes with error in dmesg like: usb_transfer_complete: actlen > len 2304 > 1920 I do have a note to dig into this, but never has a time to make a normal investigation. Maybe it rings some bells... -- wbr, Kirill
