Re: VIA KT400 + Kernel 2.6.12 + IO-APIC + uhci_hcd = IRQ trouble

[Michel Bouissou <michel@bouissou.net>]

Le Lundi 25 Juillet 2005 21:18, Alan Stern a écrit :
>
> It seems quite clear that the EHCI controller's IRQ line is causing the
> problems.  Just out of curiousity, what happens if you really do remove
> the UHCI driver, keeping only the EHCI driver, and then plug in the mouse?
> Off hand I would expect nothing much to happen -- maybe a line or two in
> the system log, no change to the IRQ counters, and the mouse doesn't work
> (not even erratically).

As you expect, in such a condition (with only ehci loaded), absolutely nothing 
happens when plugging the mouse.

OTOH, a high-speed device is recognized, althouh it generates messages like:

totor kernel: usb 1-5: device not accepting address 3, error -71
totor kernel: usb 1-5: new high speed USB device using ehci_hcd and address 4
totor kernel: usb 1-5: device not accepting address 4, error -71
totor kernel: usb 1-5: new high speed USB device using ehci_hcd and address 5

If plugged to any USB socket, except the two integrated to the motherboard 
connectors plate. There only it fully succeeds without such errors.

Cheers.

-- 
Michel Bouissou <michel@bouissou.net> OpenPGP ID 0xDDE8AC6E