On Sat, 3 Dec 2005, Travis H. wrote:

> Hi, I'm going to lump a bunch of things into one email to save your patience.
> 
> kernel: 2.6.13 SMP
> 
> First, my PCI card probes as ehci but doesn't really seem to work very well:
> 
> $ cat /proc/bus/usb/devices
...
> # cat /proc/interrupts  | grep -i usb; sleep 10; cat /proc/interrupts 
> | grep -i usb
>  16:          6         29   IO-APIC-level  ehci_hcd:usb4
>  18:    3200127    3561228   IO-APIC-level  uhci_hcd:usb2
>  19:    7971448   13299277   IO-APIC-level  libata, uhci_hcd:usb1, 
> uhci_hcd:usb3
>  16:          6         29   IO-APIC-level  ehci_hcd:usb4
>  18:    3200127    3561228   IO-APIC-level  uhci_hcd:usb2
>  19:    7971448   13301709   IO-APIC-level  libata, uhci_hcd:usb1, 
> uhci_hcd:usb3
...
> However, if I "rmmod ehci-hcd" and then  "modprobe ohci-hcd", nothing happens
> 
> Then, if I remove and re-insert the device, it sees it:

There's not much point in loading ohci-hcd, since you don't have any OHCI 
controllers.

> What's the deal?  Anyone got any tips?
> 
> I can work-around by uncommenting this:
> 
> # tail -n 1 /etc/modprobe.conf
> #alias ehci-hcd ohci-hcd
> 
> However, that's pretty ugly.

It's also pretty strange.  If you want to disable loading ehci-hcd, put 
this in modprobe.conf instead:

install ehci-hcd /bin/true

> Also, sometimes I get these:
> 
> Nov 17 04:43:12 hostname kernel: drivers/usb/input/hid-core.c: control
> queue full
> 
> Do I care?

Probably not.

These VIA USB cards seem to have some strange problems.  You can try 
posting your message on linux-usb-devel, where it may attract the 
attention of more USB developers.

Alan Stern



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