Hello, I have 2 soundcards: % cat /proc/asound/cards 0 [PCH ]: HDA-Intel - HDA Intel PCH HDA Intel PCH at 0xf7e00000 irq 42 1 [Pro ]: USB-Audio - FastTrack Pro M-Audio FastTrack Pro at usb-0000:00:1d.0-1.1, full speed I run jackd on the second one of course. When starting puredata, even if I don't set it up to use JACK, I get this error in dmesg: hda-intel: IRQ timing workaround is activated for card #0. Suggest a bigger bdl_pos_adj. --- Jackd, on its side, produces very frequent and regular xruns. I close puredata, and xruns continue to occur: Jack: ALSA XRun wait_status = 0 Jack: JackRequest::Notification Jack: JackEngine::NotifyClient: no callback for event = 3 Jack: JackEngine::NotifyClient: no callback for event = 3 Jack: JackPosixMutex::Unlock res = 1 Jack: JackExternalClient::ClientNotify ref = 2 client = qjackctl name = qjackctl notify = 3 Jack: fPollTable i = 2 fd = 12 Jack: JackClient::ClientNotify ref = 2 name = qjackctl notify = 3 Jack: JackClient::kXRunCallback Jack: **** alsa_pcm: xrun of at least 0.032 msecs Jack: fPollTable i = 1 fd = 11 Jack: ALSA XRun wait_status = 0 Jack: JackRequest::Notification Jack: JackEngine::NotifyClient: no callback for event = 3 Jack: JackEngine::NotifyClient: no callback for event = 3 Jack: JackPosixMutex::Unlock res = 1 Jack: JackExternalClient::ClientNotify ref = 2 client = qjackctl name = qjackctl notify = 3 Jack: fPollTable i = 2 fd = 12 Jack: JackClient::ClientNotify ref = 2 name = qjackctl notify = 3 Jack: JackClient::kXRunCallback Jack: **** alsa_pcm: xrun of at least 0.008 msecs Jack: fPollTable i = 1 fd = 11 Jack: ALSA XRun wait_status = 0 Jack: JackRequest::Notification Jack: JackEngine::NotifyClient: no callback for event = 3 Jack: JackEngine::NotifyClient: no callback for event = 3 Jack: JackPosixMutex::Unlock res = 1 Jack: JackExternalClient::ClientNotify ref = 2 client = qjackctl name = qjackctl notify = 3 Jack: fPollTable i = 2 fd = 12 Jack: JackClient::ClientNotify ref = 2 name = qjackctl notify = 3 Jack: JackClient::kXRunCallback Jack: **** alsa_pcm: xrun of at least 0.009 msecs Jack: fPollTable i = 1 fd = 11 Jack: JackRequest::Notification Jack: JackEngine::NotifyClient: no callback for event = 3 Jack: JackEngine::NotifyClient: no callback for event = 3 Jack: JackPosixMutex::Unlock res = 1 Jack: JackExternalClient::ClientNotify ref = 2 client = qjackctl name = qjackctl notify = 3 Jack: ALSA XRun wait_status = 0 Jack: fPollTable i = 2 fd = 12 Jack: JackClient::ClientNotify ref = 2 name = qjackctl notify = 3 Jack: JackClient::kXRunCallback Jack: **** alsa_pcm: xrun of at least 0.010 msecs Jack: fPollTable i = 1 fd = 11 Jack: ALSA XRun wait_status = 0 Jack: JackRequest::Notification Jack: JackEngine::NotifyClient: no callback for event = 3 Jack: JackEngine::NotifyClient: no callback for event = 3 Jack: JackPosixMutex::Unlock res = 1 Jack: JackExternalClient::ClientNotify ref = 2 client = qjackctl name = qjackctl notify = 3 Jack: fPollTable i = 2 fd = 12 Jack: JackClient::ClientNotify ref = 2 name = qjackctl notify = 3 Jack: JackClient::kXRunCallback Jack: **** alsa_pcm: xrun of at least 0.005 msecs Jack: fPollTable i = 1 fd = 11 Jack: ALSA XRun wait_status = 0 Jack: JackRequest::Notification Jack: JackEngine::NotifyClient: no callback for event = 3 Jack: JackEngine::NotifyClient: no callback for event = 3 Jack: JackPosixMutex::Unlock res = 1 Jack: JackExternalClient::ClientNotify ref = 2 client = qjackctl name = qjackctl notify = 3 Jack: fPollTable i = 2 fd = 12 Jack: JackClient::ClientNotify ref = 2 name = qjackctl notify = 3 Jack: JackClient::kXRunCallback Jack: **** alsa_pcm: xrun of at least 0.051 msecs Jack: fPollTable i = 1 fd = 11 Jack: ALSA XRun wait_status = 0 Jack: JackRequest::Notification Jack: JackEngine::NotifyClient: no callback for event = 3 Jack: JackEngine::NotifyClient: no callback for event = 3 Jack: JackPosixMutex::Unlock res = 1 Jack: JackExternalClient::ClientNotify ref = 2 client = qjackctl name = qjackctl notify = 3 Jack: fPollTable i = 2 fd = 12 Jack: JackClient::ClientNotify ref = 2 name = qjackctl notify = 3 Jack: JackClient::kXRunCallback 17:34:43.873 Récupération de désynchronisation (XRUN) (13 sauté). Jack: **** alsa_pcm: xrun of at least 0.027 msecs Jack: fPollTable i = 1 fd = 11 Jack: ALSA XRun wait_status = 0 Jack: JackRequest::Notification Jack: JackEngine::NotifyClient: no callback for event = 3 Jack: JackEngine::NotifyClient: no callback for event = 3 Jack: JackPosixMutex::Unlock res = 1 Jack: JackExternalClient::ClientNotify ref = 2 client = qjackctl name = qjackctl notify = 3 Jack: fPollTable i = 2 fd = 12 Jack: JackClient::ClientNotify ref = 2 name = qjackctl notify = 3 Jack: JackClient::kXRunCallback Jack: **** alsa_pcm: xrun of at least 0.008 msecs Jack: fPollTable i = 1 fd = 11 Jack: ALSA XRun wait_status = 0 Jack: JackRequest::Notification Jack: JackEngine::NotifyClient: no callback for event = 3 Jack: JackEngine::NotifyClient: no callback for event = 3 Jack: JackPosixMutex::Unlock res = 1 Jack: JackExternalClient::ClientNotify ref = 2 client = qjackctl name = qjackctl notify = 3 Jack: fPollTable i = 2 fd = 12 Jack: JackClient::ClientNotify ref = 2 name = qjackctl notify = 3 Jack: JackClient::kXRunCallback Jack: **** alsa_pcm: xrun of at least 0.009 msecs --- When I disable snd-hda-intel, I seem to be able to run jackd & puredata without trouble. Other audio apps don't produce such results, but I guess puredata makes some tests at startup which produce this issue. I'm unsure where to address this issue, but hope this report can be useful in some way, so if anyone has clues about where to investigate ... Cheers, 01 === Other infos: % uname -a Linux ___ 3.2.0-1-rt-amd64 #1 SMP PREEMPT RT Fri Feb 17 06:10:34 UTC 2012 x86_64 GNU/Linux