** Description changed: + -- StableReleaseUpdates candidate (for Maverick) information follows -- + + Impact statement: Due to changes in alsa-lib configuration file parsing + (an overly-optimistic short-circuit) as shipped in Maverick final, + certain virtual hw devices and audio cards that lack a definition file + in /usr/share/alsa/cards/ are not exposed properly to userspace. This + impact is manifested via missing virtual hw devices and/or cards. The + original description below (i.e., this bug) contains an example of the + former; bug 637947 contains an example of the latter. + + Fix: It is worth noting that, to properly address both bugs mentioned + above, both source changes and default configuration file changes must + be made. These changes are contained in debian/patches/lp652035-fix- + missing-hw-devices.patch and debian/patches/lp652035-use-extended- + namehints.patch, respectively, as seen at http://bazaar.launchpad.net + /~ubuntu-core-dev/alsa-lib/ubuntu.new/revision/66. + + Minimal patch: http://bazaar.launchpad.net/%7Eubuntu-core-dev/alsa- + lib/ubuntu.new/diff/66 + + TEST CASE: One test case is provided in (the entirety of) bug 637947. + Another is given below. + + Regression potential: There is a *very* low probability that (native) + ALSA applications may not be equipped to handle the additional + information exposed by extended hints (enabled by + debian/patches/lp652035-use-extended-namehints.patch). In practice, + this probability has been so trivial as to be negligible. Further, + there would not be crashes, only additional virtual hw device(s) exposed + in the UIs of graphical ALSA applications that offer potentially- + confusing device strings. This probability is sufficiently negligible + in light of its afforded fix of exposing sufficient information to + userspace to "make audio devices work." + + -- Original defect report follows -- + When upgrading to libasound2 1.0.23-1ubuntu2 my usb sound card stop being discovered by programs like aplay, mumble. aplay -L will not list the usb sound devices anymore. The attachment will show my problem before and after installing the latest version of libasound2. ProblemType: Bug DistroRelease: Ubuntu 10.10 Package: libasound2 1.0.22-0ubuntu7 ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4 Uname: Linux 2.6.35-22-generic x86_64 NonfreeKernelModules: nvidia Architecture: amd64 Date: Thu Sep 30 15:02:12 2010 InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1) SourcePackage: alsa-lib
-- libasound2 not finding usb sound card https://bugs.launchpad.net/bugs/652035 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
