Hi all, now here is one of the weirdest problems I have come across in
the past years. Actually it is halting my current production even, but
I am primarily interested how this error is caused (and how it can be
solved):
The sampling rate of my RME HDSP Card is set from "Internal 44.1k" to
"Internal 48k" upon connecting a Yamaha DM1000 mixing console via usb!
The console does not provide a USB audio interface, but several midi
ports over USB, using the snd_usb_audio module.
cat /proc/asound/cards:
0 [Intel ]: HDA-Intel - HDA Intel
HDA Intel at 0xf2520000 irq 43
1 [DSP ]: H-DSP - Hammerfall DSP
RME Hammerfall DSP + Multiface at 0xf0000000,
irq 19
2 [DM1000 ]: USB-Audio - DM1000
Yamaha DM1000 at usb-0000:00:1d.0-1.2, full
speed
29 [ThinkPadEC ]: ThinkPad EC - ThinkPad Console Audio Control
ThinkPad Console Audio Control at EC reg 0x30,
fw 6QHT26WW-1.07
>From HDSP's alsamixer I can see that upon connecting the DM1000 the
control "Sample Clock Source Locking" gets set to [Off], and the
sample rate is set to 48k as described above.
The change is also reflected in the 'hdspconf' software that
configures some properties of the card.
cat /proc/asound/pcm does not list the DM1000:
00-00: CONEXANT Analog : CONEXANT Analog : playback 1 : capture 1
00-03: HDMI 0 : HDMI 0 : playback 1
01-00: RME Hammerfall DSP + Multiface : RME Hammerfall DSP + Multiface
: playback 1 : capture 1
This is on a Debian box runnig kernel 3.2.0-4-rt-amd64
Can anyone imagine what causes this strange behavior?
Thank you so much for all hints
best, P
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