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

[Michel Bouissou]

Le Mardi 12 Juillet 2005 03:54, Alan Stern a écrit :
> > So the problem is circled to 2.6 kernel, uhci_hcd and UP IO-APIC.
>
> Don't rule out the hardware too quickly.  2.4 and 2.6 manage the UHCI
> controllers in different ways.

I saw ;-)

> In particular, the usb-uhci driver in 2.4 does not suspend the controller
> when no devices are attached, whereas uhci-hcd in 2.6 does.  (So does the
> "alternate" uhci driver in 2.4.)  [...]

> To try and help pin things down, tomorrow (i.e., Tuesday) I'll send you a
> test patch to completely disable the UHCI controllers, leaving them awake
> and idle, not generating interrupts.  If you still get those spurious
> IRQs, they will have to come from somewhere else.  (Assuming you can
> devote server time to this sort of testing...)

I'll try my best, although I will have little time for playing with this until 
the end of this week, and will be on travel next week. But if you send me a 
test patch, I'll try my best to test it.

Cheers.

-- 
Michel Bouissou <michel@xxxxxxxxxxxx> OpenPGP ID 0xDDE8AC6E
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