Re: Crackling sound from usb sound device
On Sat, 2013-03-23 at 17:11 +0100, Ralf Mardorf wrote:
> On Sat, 2013-03-23 at 16:04 +0100, Klaus Pieper wrote:
> > > $ lsusb -t
> > >
> > /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/6p, 480M
> > |__ Port 5: Dev 2, If 0, Class=hub, Driver=hub/4p, 480M
> > |__ Port 1: Dev 6, If 0, Class=stor., Driver=usb-storage, 480M
> > |__ Port 2: Dev 4, If 0, Class=HID, Driver=usbhid, 1.5M
> > |__ Port 3: Dev 5, If 0, Class=HID, Driver=usbhid, 1.5M
> > |__ Port 4: Dev 7, If 0, Class=HID, Driver=usbhid, 12M
> > |__ Port 4: Dev 7, If 1, Class=audio, Driver=snd-usb-audio, 12M
> > |__ Port 4: Dev 7, If 2, Class=audio, Driver=snd-usb-audio, 12M
> > |__ Port 6: Dev 3, If 0, Class='bInterfaceClass 0x0e not yet
> > handled', Driver=uvcvideo, 480M
> > |__ Port 6: Dev 3, If 1, Class='bInterfaceClass 0x0e not yet
> > handled', Driver=uvcvideo, 480M
>
> Does it crackle, when the USB storage device and the USB video device
> are unplugged? Were the USB storage and video devices plugged to other
> USB slots in the past?
>
> > > $ cat /proc/interrupts
> > 16: 0 0 IO-APIC-fasteoi uhci_hcd:usb6
> > 17: 0 0 IO-APIC-fasteoi uhci_hcd:usb7
> > 18: 0 0 IO-APIC-fasteoi uhci_hcd:usb8
> > 19: 0 0 IO-APIC-fasteoi ehci_hcd:usb2
> > 20: 0 0 IO-APIC-fasteoi uhci_hcd:usb3
> > 21: 0 0 IO-APIC-fasteoi uhci_hcd:usb4
> > 22: 0 0 IO-APIC-fasteoi uhci_hcd:usb5
> > 23: 1335837 1235210 IO-APIC-fasteoi ehci_hcd:usb1
>
> No IRQ issue.
No IRQ issue in the sense of, no other device does share USB IRQs, but
OTOH all USB devices use the same bus.
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