Re: [LAD] jackd and usb hub

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To: Luis Garrido <luisgarrido@...>
Cc: Linux Audio Developers <linux-audio-dev@...>
Date: Friday, October 15, 2010 - 6:42 am

Luis Garrido wrote:

The code in the EHCI driver that schedules full-speed audio packets is
buggy, so using two audio streams at the same time often does not work.
EHCI is used for all high-speed (USB 2.0) controllers, so to work around
this, you could connect the device directly to the computer (without a
hub) so that the full-speed (USB 1.x) UHCI/OHCI controller driver is
used, or unload the ehci_hcd module so that the hub is forced to run at
USB 1.x speed. (The rate-matching hub in the Intel P/Q/H 55/57 chipsets
makes both workarounds impossible.)

Regards,
Clemens
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Messages in current thread:
[LAD] jackd and usb hub, Luis Garrido, (Sat Oct 9, 12:39 am)
Re: [LAD] jackd and usb hub, Clemens Ladisch, (Fri Oct 15, 6:42 am)
Re: [LAD] jackd and usb hub, Luis Garrido, (Fri Oct 15, 9:21 am)
Re: [LAD] jackd and usb hub, Jack O'Quin, (Sat Oct 9, 2:23 am)