Le Mardi 12 Juillet 2005 20:57, Alan Stern a écrit :
> On the other hand, _something_ was generating an interrupt request that
> got mapped to IRQ 21 by the hardware. And these requests do seem to be
> associated with USB activity. Maybe the EHCI controller is responsible?
> One of your postings showed both uhci_hcd:usb2 and ehci_hcd:usb4 mapped to
> IRQ 11. That could indicate a shared signal line, which is currently
> being mapped incorrectly.
>
> You can test this a couple of ways. The easiest is to rmmod ehci_hcd, or
> prevent it from being loaded in the first place, by renaming
> /lib/modules/.../drivers/usb/host/ehci_hcd.ko so that modprobe can't find
> it. Also your BIOS may offer the option of disabling USB 2.0 support
> entirely. Try doing this under the kernel that has the test patch
> installed.
I've tested as you suggest :
- Disabled USB 2.0 in BIOS
- Renamed ehci_hcd.ko so that modprobe can't find it
- Booted the test-patched kernel with same options as previously, MOUSE
UNPLUGGED.
- After boot "cat /proc/interrupts" shows "0" count for IRQ 21
- Nothing special isn't logged anymore in dmesg or /var/log/messages.
- Plugging / unplugging the mouse or other devices doesn't cause anything
visible to happen. Nothing gets logged, IRQ 21 counter stays at 0. I could as
well not have done it ;-)
> Without ehci_hcd loaded, the EHCI controller should not generate any
> interrupt requests. If your problem then goes away, and plugging or
> unplugging the mouse doesn't cause anything unusual to happen, that will
> be a pretty clear indication.
Well, so that's a pretty clear indication, but surely clearer to you than to
me ;-)
So, what's up, doc ? ;-))
--
Michel Bouissou <[email protected]> OpenPGP ID 0xDDE8AC6E
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