can confirm this problem exists in 13.10 tried the workarounds with pacat but to no avail, but there is some strange but consistent behaviour:
initially the latency is around the sub 50ms mark, but every 10secs it increases exponentially until you get a >1sec delay -- 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/566381 Title: Lag when using module-loopback Status in “pulseaudio” package in Ubuntu: Confirmed Bug description: Binary package hint: pulseaudio Using pactl load-module module-loopback I can route the mic input through output. However, the audio that comes out is about half a second behind the audio coming in. This is okay for some things, but for others, like musical instruments, game consoles, etc., the lag makes it pretty much unusable for these uses. Back in alsa this used to work fine without lag. ProblemType: Bug DistroRelease: Ubuntu 10.04 Package: pulseaudio 1:0.9.22~0.9.21+stable-queue-32-g8478-0ubuntu14 ProcVersionSignature: Ubuntu 2.6.32-19.28-generic 2.6.32.10+drm33.1 Uname: Linux 2.6.32-19-generic x86_64 NonfreeKernelModules: nls_iso8859_1 nls_cp437 btrfs zlib_deflate crc32c libcrc32c ufs qnx4 hfsplus hfs minix ntfs vfat msdos fat jfs xfs exportfs reiserfs pata_jmicron acpiphp michael_mic arc4 hidp rfcomm binfmt_misc sco bridge stp bnep l2cap vboxnetadp vboxnetflt dm_crypt snd_hda_codec_idt snd_hda_codec_intelhdmi snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi vboxdrv snd_rawmidi joydev snd_seq_midi_event lp snd_seq snd_timer snd_seq_device lib80211_crypt_tkip snd parport soundcore wl dell_wmi btusb psmouse dell_laptop dcdbas ricoh_mmc snd_page_alloc lib80211 sdhci_pci sdhci led_class serio_raw bluetooth dm_raid45 xor fbcon tileblit font bitblit softcursor vga16fb vgastate usbhid hid i915 drm_kms_helper ohci1394 drm i2c_algo_bit ieee1394 sky2 intel_agp ahci video output AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21. Architecture: amd64 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog] Subdevices: 0/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: matthew 10508 F.... pulseaudio /dev/snd/pcmC0D0c: matthew 10508 F...m pulseaudio /dev/snd/pcmC0D0p: matthew 10508 F...m pulseaudio Card0.Amixer.info: Card hw:0 'Intel'/'HDA Intel at 0xfe9fc000 irq 21' Mixer name : 'SigmaTel STAC9228' Components : 'HDA:14f12c06,14f1000f,00100000 HDA:10951392,1028022f,00100000 HDA:83847616,1028022f,00100402' Controls : 23 Simple ctrls : 12 Date: Sun Apr 18 21:42:33 2010 InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Beta amd64 (20100318) ProcEnviron: LANG=en_US.utf8 SHELL=/bin/bash SourcePackage: pulseaudio dmi.bios.date: 03/10/2008 dmi.bios.vendor: Dell Inc. dmi.bios.version: A11 dmi.board.name: 0U990C dmi.board.vendor: Dell Inc. dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA11:bd03/10/2008:svnDellInc.:pnInspiron1525:pvr:rvnDellInc.:rn0U990C:rvr:cvnDellInc.:ct8:cvr: dmi.product.name: Inspiron 1525 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/566381/+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
