[Ardour-Dev] Alsa works, Ardour/Jack fails

[Mike Mazarick]

I'm into a rather unusual problem, and would like a pointer towards how to
diagnose the issue further.

 

I have 4 soundcards with 8 channels each (drivers are not in the Alsa tree
yet), which are sync'd together to behave as one sound card.

The interrupts on all but the master are disabled. 

 

I can clearly play sound with aplay on all 32 channels. 

 

However, when I play the 4 cards using qjackctl and ardour2, I get
distortion on the first 24 channels, and only static/white noise on the last
8.   The last 8 channels sound like a bad guitar cord that is being wiggled
around.

 

Has anyone run into anything similar to this?    The driver writes to the
/var/log/messages file, and everything looks good there, and also looks good
in Jack (no XRUNS, etc).   If you have a clean 'divide and conquer' idea,
I'm all ears.

 

TIA,

 

Mike Mazarick

 

Here's and example of the /var/log/messages file (while setup for 512
frames/period and 4 periods/buffer in qjackctl):

.

Jan 12 22:18:04 localhost kernel: pci_gl824_probe vendor=0x10b5
device=0x2108 subvendor=0x2020 subdevice=0x840

Jan 12 22:18:04 localhost kernel: pci_gl824_probe vendor=0x10b5
device=0x2108 subvendor=0x2020 subdevice=0x840

Jan 12 22:18:04 localhost kernel: ACPI: PCI Interrupt 0000:05:00.0[A] -> GSI
16 (level, low) -> IRQ 16

Jan 12 22:18:04 localhost kernel: api_gl824_request_card index 0

Jan 12 22:18:04 localhost kernel: api_gl824_map_regions

Jan 12 22:18:04 localhost kernel: uart_gl824_initialize

.

Jan 12 22:18:09 localhost kernel: pld_gl824_disable_audio_interrupts

Jan 12 22:18:09 localhost kernel:last message repeated 3 times

Jan 12 22:18:09 localhost kernel: api_gl824_find_input_clocks 1 ---> 0

Jan 12 22:18:09 localhost kernel: api_gl824_find_input_clocks 3 ---> 1

Jan 12 22:18:09 localhost kernel: api_gl824_find_input_clocks 2 ---> 3

Jan 12 22:18:09 localhost kernel: api_gl824_find_input_clocks card 3 is a
master, enabling interrupts for it

Jan 12 22:18:09 localhost kernel: pld_gl824_enable_audio_interrupts

.

Jan 12 22:19:34 localhost kernel: pcm_gl824_output_prepare Attempting to
allocate 32 channels GL mode N32

Jan 12 22:19:34 localhost kernel: pcm_gl824_output_prepare Card channels
0..31 allocated to substream

Jan 12 22:19:34 localhost kernel: pcm_gl824_output_trigger 1

Jan 12 22:22:54 localhost kernel: pcm_gl824_output_trigger 0

Jan 12 22:22:54 localhost kernel: api_gl824_stop Master card's clock
position stopped at 1

Jan 12 22:22:54 localhost kernel: api_gl824_stop Slave card's clock position
stopped at 1

Jan 12 22:22:54 localhost kernel:last message repeated 2 times

Jan 12 22:22:54 localhost kernel: api_gl824_stop ISR took between 181 and
272 samples

Jan 12 22:22:54 localhost kernel: api_gl824_stop Buffer transfers TO CARD
within ISR took between 180 and 271 samples

Jan 12 22:22:54 localhost kernel: api_gl824_stop Buffer transfers FROM CARD
within ISR took between 0 and 1 samples

Jan 12 22:22:54 localhost kernel: pcm_gl824_output_hw_free

Jan 12 22:22:54 localhost kernel: pcm_gl824_output_hw_free

Jan 12 22:22:54 localhost kernel: pcm_gl824_output_close

 

 

 

 

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