On Sat, November 3, 2012 4:23 am, Ralf Mardorf wrote: > if I remove all USB stuff I still see irq/18-ohci_hcd [1]. Ya, they will always show up because the ports are there. But if nothing is plugged in there should be no interrupts generated. If you look at cat /proc/interrupts, you will see which USB ports are are hooked to which IRQs. Mine shows: 16: 353468 0 IO-APIC-fasteoi uhci_hcd:usb2, uhci_hcd:usb5, nouveau 17: 292646 0 IO-APIC-fasteoi eth0 18: 1537 0 IO-APIC-fasteoi ata_piix, uhci_hcd:usb4 19: 0 0 IO-APIC-fasteoi uhci_hcd:usb3 20: 0 0 IO-APIC-fasteoi snd_ens1370 21: 255695 0 IO-APIC-fasteoi snd_ice1712 23: 334006 0 IO-APIC-fasteoi ehci_hcd:usb1 In my case I was able to move my sound card out of the pci slot that it was sharing with USB1. You can tell which USB port is which by plugging in a USB memstick and looking at the last few lines of dmesg to see which USB port it is (great for finding the best port to plug a sound IF into BTW). You notice also that I tried to set the sound card I use for recording to a higher irq than the ens that I use as a midi card. Just switching those two around made a difference. I happen to have 5 pci slots to play with as this is an older machine. -- Len Ovens www.OvenWerks.net _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
