Hi, Got some JACK crashes with Oomidi and Linuxsampler running. http://fpaste.org/az62/ Not to solve this particular problem directly, but just to check my system, comments are welcome ;) I don't have the snd-hrtimer loaded, is it needed? For what? Hardware: T61, duocore, 2 gb MEM Echo audiofire 2 Firewire new stack Debian testing 64bit cpu scaling set on 'performance' $ uname -a Linux debian 3.0.0-2-rt-amd64 #1 SMP PREEMPT RT Thu Feb 23 14:46:22 UTC 2012 x86_64 GNU/Linux # apt-cache policy jackd1 jackd1: Installed: 1:0.121.3+20120222git81e8f031-1 # apt-cache policy libffado2 libffado2: Installed: 2.0.99+svn2019-1 cat /etc/security/limits.d/audio.conf @audio - rtprio 90 @audio - memlock unlimited cat /etc/modules: firewire-sbp2 loop #raw1394 fuse #snd-virmidi #tp_smapi #hdaps acpi-cpufreq #speedstep-centrino # or equivalent for your CPU #cpufreq_userspace # cat /sys/class/rtc/rtc0/max_user_freq 2048 #cat /proc/sys/dev/hpet/max-user-freq 2048 cat /proc/interrupts CPU0 CPU1 0: 4878973 4847906 IO-APIC-edge timer 1: 4163 4141 IO-APIC-edge i8042 8: 0 1 IO-APIC-edge rtc0 9: 32195 32176 IO-APIC-fasteoi acpi 12: 510669 501374 IO-APIC-edge i8042 14: 35515 34489 IO-APIC-edge ata_piix 15: 30 30 IO-APIC-edge ata_piix 16: 0 0 IO-APIC-fasteoi uhci_hcd:usb5 (firewire card: 17: 859819 903068 IO-APIC-fasteoi firewire_ohci, uhci_hcd:usb6 ) 18: 0 0 IO-APIC-fasteoi uhci_hcd:usb7 19: 1 1 IO-APIC-fasteoi ehci_hcd:usb2 20: 13 18 IO-APIC-fasteoi uhci_hcd:usb3 21: 0 0 IO-APIC-fasteoi uhci_hcd:usb4 22: 1 1 IO-APIC-fasteoi ehci_hcd:usb1 40: 0 0 PCI-MSI-edge PCIe PME 41: 0 0 PCI-MSI-edge PCIe PME 42: 0 0 PCI-MSI-edge PCIe PME 43: 0 0 PCI-MSI-edge PCIe PME 44: 0 0 PCI-MSI-edge PCIe PME 45: 1930 2378 PCI-MSI-edge eth0 46: 127155 126057 PCI-MSI-edge iwl4965 47: 156210 153268 PCI-MSI-edge i915 48: 35011 36735 PCI-MSI-edge hda_intel NMI: 1678 1670 Non-maskable interrupts LOC: 3086794 3541122 Local timer interrupts SPU: 0 0 Spurious interrupts PMI: 1678 1670 Performance monitoring interrupts IWI: 0 0 IRQ work interrupts RES: 1443231 1135099 Rescheduling interrupts CAL: 7122 7510 Function call interrupts TLB: 6913 9841 TLB shootdowns TRM: 0 0 Thermal event interrupts THR: 0 0 Threshold APIC interrupts MCE: 0 0 Machine check exceptions MCP: 2158 2158 Machine check polls ERR: 0 MIS: 0