[alsa-devel] -32 broken pipe

Clemens Ladisch clemens at ladisch.de
Fri Oct 15 09:51:09 CEST 2010

(please don't create new threads for the same topic)

Cem ERGEN wrote:
> i've 8 hubs and each hubs has got 4 usb soundcards,

With 16-bit samples at 48 kHz, a full-speed bus has just barely enough
bandwidth for one stream with eight channels, or seven on-channel

Due to bugs in the EHCI driver, using multiple full-speed audio devices
connected to one or more high-speed hubs connected to one controller is
likely to fail.

Try using multiple controllers, and forcing the hubs to work at full
speed by unloading the ehci_hcd module.


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