From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lee Revell Subject: Re: Problems with Hercules DJ Console and the usb-audio driver Date: Thu, 15 Sep 2005 14:10:41 -0400 Message-ID: <1126807842.3185.3.camel@mindpipe> References: Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: alsa-devel-admin@lists.sourceforge.net Errors-To: alsa-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Clemens Ladisch Cc: Horms , Daniel Svensson , debian-kernel@lists.debian.org, Alsa-devel@lists.sourceforge.net List-Id: alsa-devel@alsa-project.org On Thu, 2005-09-15 at 14:13 +0200, Clemens Ladisch wrote: > Horms wrote: > > On Wed, Sep 14, 2005 at 03:29:13PM +0200, Daniel Svensson wrote: > > > CONFIG_USB_BANDWIDTH is enabled by default in the debian kernel. Could > > > this be changed? According to the alsa developer who helped me debug the > > > problem with my usb soundcard CONFIG_USB_BANDWIDTH should be disabled. > > > The original email is forwarded here: > > > > That sounds fair enough to me, as long there are no objections > > from the rest of the kernel-team. > > > > Clemens, could you provide a little more information on > > the problems that CONFIG_USB_BANDWIDTH causes? > > The code that implements it computes wrong values for the bandwidth > utilization. This doesn't seem to matter much for full speed stereo > devices, but we have several bug reports for multichannel and/or high > speed devices where usb_submit_urb() incorrectly returns -ENOSPC > errors. > > The comment above the usb_check_bandwidth() function in hcd.c lists > several of the known bugs. > > Perhaps CONFIG_USB_BANDWIDTH should have been marked BROKEN instead of > just EXPERIMENTAL. Has this been reported upstream? Possibly the USB maintainers don't know that this is causing real problems for users. Lee ------------------------------------------------------- SF.Net email is sponsored by: Tame your development challenges with Apache's Geronimo App Server. Download it for free - -and be entered to win a 42" plasma tv or your very own Sony(tm)PSP. Click here to play: http://sourceforge.net/geronimo.php