I'm going to mark this as invalid since it's clearly not an issue with pulseaudio, I don't understand why it has enough bandwidth for HD video, but not for a single audio channel... but that requires more research and a different bug, perhaps the USB system pools USB 1.1 and USB 2.0 bandwidth separately.
** Changed in: pulseaudio (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to pulseaudio in Ubuntu. https://bugs.launchpad.net/bugs/1134915 Title: 4th USB audio device cannot record. Status in “pulseaudio” package in Ubuntu: Invalid Bug description: Not completely sure if this is pulseaudio or the underlying ALSA... but I have 3 working USB audio devices, when I plug in the 4th it is not possible to record from it. You can play back to any of the 4 devices, but, whichever is plugged in last cannot be recorded from, and shows up without a vu meter in pavucontrol (Even tho it has volume sliders!) ProblemType: Bug DistroRelease: Ubuntu 13.04 Package: pulseaudio 1:3.0-0ubuntu3 ProcVersionSignature: Ubuntu 3.8.0-7.15-generic 3.8.0 Uname: Linux 3.8.0-7-generic x86_64 NonfreeKernelModules: nvidia ApportVersion: 2.8-0ubuntu4 Architecture: amd64 Date: Wed Feb 27 23:15:17 2013 InstallationDate: Installed on 2013-01-19 (39 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130118) MarkForUpload: True SourcePackage: pulseaudio UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 01/20/2011 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 1253 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: P8P67 PRO dmi.board.vendor: ASUSTeK Computer INC. dmi.board.version: Rev 1.xx dmi.chassis.asset.tag: Asset-1234567890 dmi.chassis.type: 3 dmi.chassis.vendor: Chassis Manufacture dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1253:bd01/20/2011:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP8P67PRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion: dmi.product.name: System Product Name dmi.product.version: System Version dmi.sys.vendor: System manufacturer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1134915/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp