From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pablo Yaggi Subject: C-Media / usb device bug ? Date: Mon, 18 Sep 2006 19:21:10 -0300 Message-ID: <200609181921.10510.pyaggi@alsurdelsur.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@lists.sourceforge.net Errors-To: alsa-devel-bounces@lists.sourceforge.net To: alsa-devel@lists.sourceforge.net List-Id: alsa-devel@alsa-project.org (sorry if this come twice, i think i miss posted first one) 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 ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV