Upon plugging in a Dell AE515 sound bar (which has both speakers and I microphone) the following appears in dmesg: [364822.020172] usb 1-4.3.1: new full-speed USB device number 17 using xhci_hcd [364822.339223] usb 1-4.3.1: New USB device found, idVendor=413c, idProduct=a506, bcdDevice= 0.04 [364822.339229] usb 1-4.3.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [364822.339233] usb 1-4.3.1: Product: DELL PROFESSIONAL SOUND BAR AE515 [364822.339235] usb 1-4.3.1: Manufacturer: Dell [364822.556180] input: Dell DELL PROFESSIONAL SOUND BAR AE515 Consumer Control as /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4.3/1-4.3.1/1-4.3.1:1.3/0003:413C:A506.000C/input/input48 [364822.608418] input: Dell DELL PROFESSIONAL SOUND BAR AE515 as /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4.3/1-4.3.1/1-4.3.1:1.3/0003:413C:A506.000C/input/input49 [364822.608888] hid-generic 0003:413C:A506.000C: input,hiddev96,hidraw1: USB HID v1.11 Device [Dell DELL PROFESSIONAL SOUND BAR AE515] on usb-0000:00:14.0-4.3.1/input3 [364822.716803] usb 1-4.3.1: 1:1: cannot get freq at ep 0x81 [364822.732748] usb 1-4.3.1: 2:1: cannot get freq at ep 0x1 [364822.735035] usb 1-4.3.1: 1:1: cannot get freq at ep 0x81 So it looks like this chip needs a quirk (on a technicality -- it otherwise makes sound properly). I found the "cannot get freq" messages went away using quirk_alias="413ca506:291230c8".
Created attachment 295057 [details] alsa-info data including sound bar
Unless you see other problems than those error messages, we can shut up it by adding your device to the quirk list.
Created attachment 295603 [details] Fix patch
I've tried the patch and confirm that it silences the messages. The device's audio functions are working properly to the extent I have tested.
OK, I submitted and merged the fix now in sound.git tree. It slipped from 5.12-rc2 merge, but will be included in 5.12-rc3 or rc4. Let's close.