Hi Guillaume,
On Tue, Feb 04, 2014 at 06:29:28PM +0100, Guillaume Pellerin wrote:
> Sorry Lewis, I was AFK these days. Back now :)
>
> Can you try to add this line to /etc/modprobe.d/alsa-base.conf
>
> options snd_usb_audio vid=0x763 pid=0x2012 device_setup=0x03 enable=1 nrpacks=1
>
> and then:
> $ sudo modprobe -r snd-usb-audio
> $ sudo modprobe snd-usb-audio
I added your suggested kernel module option line and rebooted my
system for good measure.
$ cat /proc/asound/card0/stream0 # now gives:
M-Audio FastTrack Pro at usb-0000:00:1d.0-2, full speed : USB Audio
Playback:
Status: Stop
Interface 2
Altset 2
Format: S24_3BE
Channels: 2
Endpoint: 3 OUT (ADAPTIVE)
Rates: 44100, 48000
Interface 2
Altset 5
Format: S24_3BE
Channels: 2
Endpoint: 3 OUT (ADAPTIVE)
Rates: 8000 - 48000 (continuous)
$ cat /proc/asound/card0/stream1 # now gives:
M-Audio FastTrack Pro at usb-0000:00:1d.0-2, full speed : USB Audio #1
Playback:
Status: Stop
Interface 3
Altset 2
Format: S24_3BE
Channels: 2
Endpoint: 4 OUT (ADAPTIVE)
Rates: 44100, 48000
Interface 3
Altset 5
Format: S24_3BE
Channels: 2
Endpoint: 4 OUT (ADAPTIVE)
Rates: 8000 - 48000 (continuous)
Capture:
Status: Stop
Interface 4
Altset 2
Format: S24_3BE
Channels: 2
Endpoint: 5 IN (SYNC)
Rates: 8000 - 48000 (continuous)
I've also updated my arecord test command to account for the the
S24_3BE format:
arecord -t raw -f S24_3BE -c2 -r 48000 -D hw:0,1 -vv | aplay -f S24_3BE -c2 -r 48000 -D hw:0,0
Unfortunately, I am still getting bad captures in about ~10% of my
test cases. I have noticed a slightly different problem in this
configuration: about half of the bad captures are not just a distorted
signal, but instead very loud pure white noise. My ears are still
ringing!
> un/replug the card and make your tests again.
>
> I must admit I've almost always use the FTP with JACK so I'm not
> completly aware of the behavior of the device without it.
>
> If this has no (good) effect, it could be something between you USB
> system and the kernel. I've discover recently that crackles could
> raise up on other cards and systems because of a dynamic USB ID
> allocation of the kernel. The pb disappeared when the option is
> switched off.
>
> So, let's continue if the first ALSA tweak doesn't work..
>
> Regards,
> Guillaume
>
No luck so far, and the mystery continues. Are there specific kernel
configuration options which you would advise disabling? Here is a
snippet from my current /proc/config.gz which shows some settings
related to USB:
# --------------------------------------------
#
# Miscellaneous USB options
#
CONFIG_USB_DEFAULT_PERSIST=y
CONFIG_USB_DYNAMIC_MINORS=y
# CONFIG_USB_OTG is not set
CONFIG_USB_MON=m
CONFIG_USB_WUSB=m
CONFIG_USB_WUSB_CBAF=m
# CONFIG_USB_WUSB_CBAF_DEBUG is not set
# --------------------------------------------
Again, your help on this one is much appreciated!
.lewis
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