linux-kernel - Re: kernel 5.4.11: problems with usb sound cards

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Date:   Sat, 1 Feb 2020 15:10:09 +0100
From:   Johan Hovold <johan@...nel.org>
To:     edes <edes@....net>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: kernel 5.4.11: problems with usb sound cards

On Sat, Feb 01, 2020 at 10:58:29AM -0300, edes wrote:
> Hello, list, I hope this is the right place to post this problem.
> 
> Changes introduced in 5.4.11 (seemingly, in drivers/usb/core/config.c)
> cause problems with at least some models of USB sound cards.
> 
> I have a Sound Devices USBPre2, a high quality sound card that until
> 5.4.10 always worked perfectly out of the box as a standard USB audio
> device.
> 
> Beginning with 5.4.11 and up to 5.5.0, when the sound card is connected,
> dmesg shows:
> 
> [ 1310.743135] usb 3-10.3: new high-speed USB device number 6 using
> xhci_hcd
> [ 1310.755472] usb 3-10.3: config 1 interface 2 altsetting 1 has
> a duplicate endpoint with address 0x85, skipping
> [ 1310.755474] usb 3-10.3: config 1 interface 2 altsetting 2 has a
> duplicate endpoint with address 0x85, skipping
> [ 1310.755852] usb 3-10.3: New USB device found, idVendor=0926,
> idProduct=0202, bcdDevice= 1.00
> [ 1310.755853] usb 3-10.3: New USB device strings: Mfr=1, Product=2,
> SerialNumber=3
> [ 1310.755854] usb 3-10.3: Product: USBPre2
> [ 1310.755855] usb 3-10.3: Manufacturer: Sound Devices
> [ 1310.755855] usb 3-10.3: SerialNumber: HB1116132005
> [ 1310.756803] usb 3-10.3: 1:3 : UAC_AS_GENERAL descriptor not found
> [ 1310.757550] hid-generic 0003:0926:0202.0005: hiddev96: USB HID v1.01
> Device
> [Sound Devices USBPre2] on usb-0000:00:14.0-10.3/input3
> [ 1310.773161] systemd-udevd[3856]: controlC0: Process '/usr/sbin/alsactl
> restore 0' failed with exit code 99.
> 
> No capture device is created under /dev/snd, and the card works only as a
> playback device.

Can you please post the output of "lsusb -v" for this device on 5.4.10
and 5.4.11, respectively?

Johan