I have a SONY SRS-ZR7 speaker which has a DAC built-in and I connect it to my machine using a USB cable to a USB 3.0 port.
The problem is that the speaker does not get recognized properly. It can play sound but when it doesn’t, or when I just don’t play any sound (like music or video), the speaker continuously gets disconnected and connected again and again. Those notifications are killing me so I have to switch them off.
I looked into the system log and I found these lines were just looping.
10/8/21 1:37 AM kernel usb 1-1: new high-speed USB device number 104 using xhci_hcd
10/8/21 1:37 AM kernel usb 1-1: New USB device found, idVendor=054c, idProduct=0b8c, bcdDevice= 1.00
10/8/21 1:37 AM kernel usb 1-1: New USB device strings: Mfr=2, Product=3, SerialNumber=4
10/8/21 1:37 AM kernel usb 1-1: Product: Sony Audio
10/8/21 1:37 AM kernel usb 1-1: Manufacturer: Sony
10/8/21 1:37 AM kernel usb 1-1: SerialNumber: 0BC614E00120BD
10/8/21 1:37 AM kernel usb 1-1: 1:7 : unsupported format bits 0x100000000
10/8/21 1:37 AM mtp-probe checking bus 1, device 104: "/sys/devices/pci0000:00/0000:00:14.0/usb1/1-1"
10/8/21 1:37 AM mtp-probe bus: 1, device: 104 was not an MTP device
10/8/21 1:37 AM mtp-probe checking bus 1, device 104: "/sys/devices/pci0000:00/0000:00:14.0/usb1/1-1"
10/8/21 1:37 AM mtp-probe bus: 1, device: 104 was not an MTP device
10/8/21 1:37 AM rtkit-daemon Supervising 7 threads of 3 processes of 1 users.
10/8/21 1:37 AM rtkit-daemon Successfully made thread 25262 of process 1287 owned by '1000' RT at priority 5.
10/8/21 1:37 AM rtkit-daemon Supervising 8 threads of 3 processes of 1 users.
10/8/21 1:37 AM kernel usb 1-1: USB disconnect, device number 104
10/8/21 1:37 AM kdeconnectd org.kde.pulseaudio: No object for name "alsa_output.usb-Sony_Sony_Audio_0BC614E00120BD-00.analog-stereo"
10/8/21 1:37 AM plasmashell org.kde.plasma.pulseaudio: No object for name "alsa_output.usb-Sony_Sony_Audio_0BC614E00120BD-00.analog-stereo"
10/8/21 1:37 AM plasmashell qrc:/plasma/plasmoids/org.kde.plasma.volume/contents/ui/ListItemBase.qml:233: TypeError: Cannot read property 'visible' of null
What causes this problem and how can I fix it?
I’m using KDE Plasma with kernel 5.14.