It's probably hardwired and dependent on the mainboard but I
thought I'd ask this anyway, just in case someone has an idea.
I notice Chuckks' /proc/interupts is like this below whereas
my Abit AN-M2 (nForce4) setup follows... is there anyway I can
manipulate my interupts so the USB devices line up on a single
IRQ like Chuckks ?
CPU0
0: 7451384 IO-APIC-edge timer
1: 16910 IO-APIC-edge i8042
8: 0 IO-APIC-edge rtc
12: 91809 IO-APIC-edge i8042
14: 55194 IO-APIC-edge ide0
16: 17785 IO-APIC-fasteoi eth1, HDA Intel
17: 124946 IO-APIC-fasteoi bcm43xx
19: 41988 IO-APIC-fasteoi ohci_hcd:usb1, ohci_hcd:usb2, ehci_hcd:usb3
20: 1 IO-APIC-fasteoi yenta, tifm_7xx1
21: 3228 IO-APIC-fasteoi acpi
CPU0 CPU1
0: 136 561 IO-APIC-edge timer
1: 49 27195 IO-APIC-edge i8042
8: 0 0 IO-APIC-edge rtc0
9: 0 30 IO-APIC-fasteoi acpi
14: 0 0 IO-APIC-edge libata
15: 0 0 IO-APIC-edge libata
16: 13465 13271804 IO-APIC-fasteoi ohci_hcd:usb1, ahci
17: 13523 11359306 IO-APIC-fasteoi ohci_hcd:usb2, eth0
18: 4 2906 IO-APIC-fasteoi ehci_hcd:usb3, HDA Intel
19: 5332 4029220 IO-APIC-fasteoi ehci_hcd:usb4, nvidia
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.
--markc
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