From: "Clemens Ladisch" <cladisch@fastmail.net>
To: Pablo Yaggi <pyaggi@alsurdelsur.com>, alsa-devel@lists.sourceforge.net
Subject: Re: C-Media / usb device bug ?
Date: Tue, 19 Sep 2006 08:36:43 +0200 [thread overview]
Message-ID: <1158647803.13410.271265867@webmail.messagingengine.com> (raw)
In-Reply-To: <200609181921.10510.pyaggi@alsurdelsur.com>
Pablo Yaggi wrote:
> 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.
What kernel version are you using?
The EHCI transaction translator code (which is responsible for moving
audio data through an high speed hub) got a bugfix in 2.6.17, but still
artificially limits the bandwidth. It will be rewritten in 2.6.18.
HTH
Clemens
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next prev parent reply other threads:[~2006-09-19 6:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-18 22:21 C-Media / usb device bug ? Pablo Yaggi
2006-09-19 6:36 ` Clemens Ladisch [this message]
2006-09-19 7:17 ` Pablo Yaggi
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