From owner-svn-src-all@FreeBSD.ORG Thu Mar 26 10:26:26 2015 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id E711EEAE; Thu, 26 Mar 2015 10:26:26 +0000 (UTC) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id B511BF75; Thu, 26 Mar 2015 10:26:26 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.9/8.14.9) with ESMTP id t2QAQQqx085747; Thu, 26 Mar 2015 10:26:26 GMT (envelope-from hselasky@FreeBSD.org) Received: (from hselasky@localhost) by svn.freebsd.org (8.14.9/8.14.9/Submit) id t2QAQQpt085746; Thu, 26 Mar 2015 10:26:26 GMT (envelope-from hselasky@FreeBSD.org) Message-Id: <201503261026.t2QAQQpt085746@svn.freebsd.org> X-Authentication-Warning: svn.freebsd.org: hselasky set sender to hselasky@FreeBSD.org using -f From: Hans Petter Selasky Date: Thu, 26 Mar 2015 10:26:26 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org Subject: svn commit: r280682 - stable/9/share/man/man4 X-SVN-Group: stable-9 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Mar 2015 10:26:27 -0000 Author: hselasky Date: Thu Mar 26 10:26:25 2015 New Revision: 280682 URL: https://svnweb.freebsd.org/changeset/base/280682 Log: MFC r280262 and r280263: Add more known bugs to the USB audio manual page. Modified: stable/9/share/man/man4/snd_uaudio.4 Directory Properties: stable/9/share/ (props changed) stable/9/share/man/ (props changed) stable/9/share/man/man4/ (props changed) Modified: stable/9/share/man/man4/snd_uaudio.4 ============================================================================== --- stable/9/share/man/man4/snd_uaudio.4 Thu Mar 26 10:25:15 2015 (r280681) +++ stable/9/share/man/man4/snd_uaudio.4 Thu Mar 26 10:26:25 2015 (r280682) @@ -29,7 +29,7 @@ .\" .\" $FreeBSD$ .\" -.Dd February 24, 2011 +.Dd March 19, 2015 .Dt SND_UAUDIO 4 .Os .Sh NAME @@ -91,12 +91,27 @@ by The .Tn PCM framework in -.Fx , -as of this writing, does not handle device un-registrations in a properly -abstracted manner, i.e., a detach request is refused by the -.Tn PCM -framework if the device is in use. -It is necessary to allow the device un-registration to complete -successfully, otherwise the +.Fx +only supports synchronous device detach. +That means all mixer and DSP character devices belonging to a given +USB audio device must be closed when receiving an error on a DSP read, +a DSP write or a DSP IOCTL request. +Else the USB audio driver will wait for this to happen, preventing +enumeration of new devices on the parenting USB controller. +.Pp +Some USB audio devices might refuse to work properly unless the sample +rate is configured the same for both recording and playback, even if +only simplex is used. +See the +.Va dev.pcm.%d.[play|rec].vchanrate +sysctls. +.Pp +The .Tn PCM -layer will panic. +framework in +.Fx +currently doesn't support the full set of USB audio mixer +controls. +Some mixer controls are only available as +.Va dev.pcm.%d.mixer +sysctls.