Line 6 POD HD500 ALSA driver problems

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Hi all,

a few days ago I got a used Line 6 POD HD500. While my main intention is
to use this as a standalone unit and, if I want to, I can always record
its analog or spdif outputs using my regular interface, it would be nice
to use this as an audio interface under Linux as well.

There is indeed an ALSA driver for the POD HD devices in recent kernels:

https://github.com/torvalds/linux/blob/master/sound/usb/line6/podhd.c

Unfortunartely I can't get it to work reliably and never managed to get
audio *output*.

If I plug it in via USB it seems to be recognized (see below), ALSA
devices spring up, Pulseaudio creates a new source and sink etc, but a)
I can't get any sound output from the headphones or the main 1/4" output
of the POD and if I try to start JACK, the jack process usually hangs
and I have to kill it with SIGKILL.

I tried different USB cables and ports on my laptop and at one point I
was even able to start JACK and record a track from the POD HD500 but
still no playback. I wasn't able to reproduce this, though.

Does anybody here use a POD HD device under Linux? If so, does
everything work as it should for you?



Chris


$ aplay -l
[...]
Karte 2: PODHD500 [POD HD500], Gerät 0: POD HD500 [POD HD500]
  Sub-Geräte: 1/1
  Sub-Gerät #0: subdevice #0

$ arecord -l
[...]
Karte 2: PODHD500 [POD HD500], Gerät 0: POD HD500 [POD HD500]
  Sub-Geräte: 1/1
  Sub-Gerät #0: subdevice #0


$ dmesg
[12183.374350] usb 4-1.5: new high-speed USB device number 3 using ehci-pci
[12183.453356] usb 4-1.5: config 1 interface 1 altsetting 0 bulk
endpoint 0x1 has invalid maxpacket 64
[12183.453364] usb 4-1.5: config 1 interface 1 altsetting 0 bulk
endpoint 0x81 has invalid maxpacket 64
[12183.531185] snd_usb_podhd 4-1.5:1.0: Line 6 POD HD500 found
[12183.533016] snd_usb_podhd 4-1.5:1.0: Line 6 POD HD500 now attached
[12183.533245] snd_usb_podhd 4-1.5:1.1: Line 6 POD HD500 found
[12183.533248] usb 4-1.5: selecting invalid altsetting 1
[12183.533250] snd_usb_podhd 4-1.5:1.1: set_interface failed
[12183.533258] snd_usb_podhd 4-1.5:1.1: Line 6 POD HD500 now disconnected
[12183.533316] snd_usb_podhd: probe of 4-1.5:1.1 failed with error -22
[12183.533655] usbcore: registered new interface driver snd_usb_podhd
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