Re: Kernel 2.6.12 + IO-APIC + uhci_hcd = Trouble

[Alan Stern]

On Tue, 12 Jul 2005, Michel Bouissou wrote:

> > In case it's not already clear, when you install this patch the UHCI
> > controllers will not be useable.
> 
> Okay, the patch applied easily and the kernel is now compiling. When 
> installed, I'll try and boot it (and will use a PS/2 mouse instead of my 
> current USB mouse, or should I rather try to plug my USB mouse to the 
> ehci_hcd controller ?).

USB mice generally run at low speed.  This means that you _can't_ plug it 
into an EHCI controller -- the controller will see that it's not a 
high-speed device and will hand it over to a companion controller, which 
in your case will be UHCI.

> How would you like me to boot ? With or without the "usb-handoff" option ? 
> With or without the BIOS "USB mouse support" option ?

Use "usb-handoff" and turn off BIOS USB mouse support.

> And once booted, what information will you be interested in ?

I'll be interested in seeing if you still get the "IRQ 21 nobody cared" 
message.

Alan Stern

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