Hi,
I'm working in a multi-capture application with alsa and i discovered
if i attach two "c-media usb headphone set" adapters to an usb hub which
is attached to my computer when i try to read from the two devices the
first one read (also open) errors with (-77) bad file descriptor status
and the other one keep working. When i attach the two devices directly to
the usb connectors (without hub) all works fine, the two devices can be
read at the same time. I proved Hubs version 1.0 and 2.0 .
Regards
Pablo
This is the /proc/asound/cards when i attach them to the hub:
(yes i also have an intel device)
0 [ICH6 ]: ICH4 - Intel ICH6
Intel ICH6 with AD1980 at 0xd0201000, irq 20
1 [default ]: USB-Audio - C-Media USB Headphone Set
C-Media USB Headphone Set at usb-0000:00:1d.1-1.3,
full speed
2 [default_1 ]: USB-Audio - C-Media USB Headphone Set
C-Media USB Headphone Set at usb-0000:00:1d.1-1.2,
full speed
and this is when i attach them directly to the computer:
0 [ICH6 ]: ICH4 - Intel ICH6
Intel ICH6 with AD1980 at 0xd0201000, irq 20
1 [default ]: USB-Audio - C-Media USB Headphone Set
C-Media USB Headphone Set at usb-0000:00:1d.0-1,
full speed
2 [default_1 ]: USB-Audio - C-Media USB Headphone Set
C-Media USB Headphone Set at usb-0000:00:1d.3-2,
full speed
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