G'day Mark, You may be able to change the IRQ of USB devices if you change the IRQ stored in the PCI configuration memory of the USB controller. Look into the setpci command, normally part of the pciutils package. Use lsusb and lspci to identify the controller, in particular the PCI device id. A rediscovery of the device is needed afterwards ... which probably means a reboot, but you could experiment with removing and re-inserting the USB controller modules. The BIOS may also have an option to change it. Some BIOS firmware may simply reassing all the IRQs during initial boot ... look for an option called configuration data. > I have a problem with distorted USB sound (Tascam US-122) > but no matter what USB port I use it is always doubled up > with another device. If I could "force" all the USB busses > onto one IRQ (or ideally ohci_hcd on one and ehci_hcd on > another), and made sure my US-122 was the only USB device, > then that might make a difference. But I disagree with your theory. Worth a try, sure. But on modern systems IRQ sharing isn't generally much of a problem, unless the driver for the other device isn't doing the right thing. -- James Cameron mailto:quozl@xxxxxxxxxxxxx http://quozl.netrek.org/ _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
