Re: [SOLVED ??] Kernel 2.6.12 + IO-APIC + uhci_hcd = Trouble

[Michel Bouissou]

Le Lundi 11 Juillet 2005 20:36, Alan Stern a écrit :
> It's also possible that the UHCI controllers are generating the unwanted
> interrupt requests.  You should make sure that Legacy USB Support is
> turned off in your BIOS settings.

My motherboard both holds USB 1.1 and USB 2.0 controllers. I don't have a 
"Legacy USB Support" option in my BIOS, all my USB options are the following:

Enable USB 1.1 controller: YES	(Surely relates to my true USB 1.1 controller)

Enable USB 2.0 controller: YES	(Same for the high speed controller ?)

Enable USB keyboard: NO

Enable USB mouse support: YES	(Well, I have one ;-)

I didn't change anything regarding these so far.

> You can also try adding the "usb-handoff" kernel parameter to your boot
> command line. 

Hey !! This one looks like the MIRACLE-OPTION !!

I just booted using my 2.6.12 kernel patched with Nathalie's patches (don't 
know if they help in there...) and the problem seems to be gone !

Nothing complains anymore about the interrupt. I have:

[root@totor etc]# cat /proc/interrupts
           CPU0
  0:     934501    IO-APIC-edge  timer
  1:       4611    IO-APIC-edge  i8042
  2:          0          XT-PIC  cascade
  4:       2779    IO-APIC-edge  serial
  7:          3    IO-APIC-edge  parport0
 14:       7909    IO-APIC-edge  ide4
 15:       7918    IO-APIC-edge  ide5
 16:      38447   IO-APIC-level  nvidia
 18:       2982   IO-APIC-level  eth0, eth1
 19:      37041   IO-APIC-level  ide0, ide1, ide2, ide3, ehci_hcd:usb4
 21:      52036   IO-APIC-level  uhci_hcd:usb1, uhci_hcd:usb2, uhci_hcd:usb3
 22:       2850   IO-APIC-level  VIA8233
NMI:          0
LOC:     934453
ERR:          0
MIS:          0


...now let's see with time if this is stable...

A thousand thanks for your suggestion Alan !

(Kernel 2.4 was working plain good without such a boot option, I didn't know 
it existed...)

(Please copy me on answers, as I'm not subscribed to the linux-kernel mailing 
list.)

Cheers.

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