Re: Problems with USB AudioEngine Speakers

Jonathan Ryshpan <jonrysh@xxxxxxxxxxx> · Fri, 08 Oct 2021 14:58:57 -0700

On Thu, 2021-10-07 at 18:55 -0700, Jonathan Ryshpan wrote:
The stock Fedora-34 with pipewire allows some audio output from the speakers but with problems.  However the system with pipewire was so unstable that I was unable to investigate:
device names changed
audio configuration changed in unexpected ways, for unknown reasons
system locked up (probably KDE Plasma lockup)
audio went from one device to another and back every second or so
...

So I reverted to pulseaudio.  The audio is now stable, but the speakers are not recognized.  Here are suspicious sections of the starts of the journals for the two setups:

Today's upgrade has mostly but not completely cured the problem, at least for pulseaudio.  The speakers started working as soon as the upgrade had taken effect, even before a reboot.  I don't see what upgraded package could have caused the device to appear; the record of the upgrade is attached (dnf-upgrade-1021-10-08.txt).  Unfortunately, the computer audio system does not always recognize the Audioengine-2+ speakers.  Maybe there is some kind of race condition.

Here are extracts from system journals showing two different boot sequences, one that works and one that doesn't:

A boot that works:
Oct 08 14:06:08 amito kernel: usb 3-14.1: New USB device found, idVendor=0a12, idProduct=4007, bcdDevice=14.86 
Oct 08 14:06:08 amito kernel: usb 3-14.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 
Oct 08 14:06:08 amito kernel: usb 3-14.1: Product: Audioengine 2+ 
Oct 08 14:06:08 amito kernel: usb 3-14.1: Manufacturer: Audioengine LLC 
Oct 08 14:06:08 amito kernel: usb 3-14.1: SerialNumber: AE202010001A2002 
Oct 08 14:06:08 amito kernel: hid-generic 0003:0A12:4007.0006: hiddev97,hidraw3: USB HID v1.11 Device [Audioengine LLC Audioengine 2+] on usb-0000:00:14.0-14.1/input2

The boot just before the one above, which doesn't work:
Oct 08 14:00:31 amito kernel: usb 3-14.1: new full-speed USB device number 8 using xhci_hcd 
Oct 08 14:00:31 amito kernel: usb 3-14.1: New USB device found, idVendor=0a12, idProduct=4007, bcdDevice=14.86 
Oct 08 14:00:31 amito kernel: usb 3-14.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 
Oct 08 14:00:31 amito kernel: usb 3-14.1: Product: Audioengine 2+ 
Oct 08 14:00:31 amito kernel: usb 3-14.1: Manufacturer: Audioengine LLC
Oct 08 14:00:31 amito kernel: usb 3-14.1: can't set config #1, error -71

-- 
Sincerely Jonathan Ryshpan <jonrysh@xxxxxxxxxxx>

	Better to light a single candle than to curse the
	darkness.

Transaction ID : 1075
Begin time     : Fri 08 Oct 2021 07:31:29 AM PDT
Begin rpmdb    : 3691:42313e892d2a353cd001b817a995289d7e64560d
End time       : Fri 08 Oct 2021 07:32:23 AM PDT (54 seconds)
End rpmdb      : 3691:2a70deb0ecd448b6fb84f078f3470266703d964b
User           : Jonathan Ryshpan <jonrysh>
Return-Code    : Success
Releasever     : 34
Command Line   : upgrade --refresh
Comment        : 
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