Re: ACPI I/O resource conflicts with ACPI region SMBI

[Sarah Sharp <sarah.a.sharp@linux.intel.com>]

On Wed, Dec 28, 2011 at 06:11:14PM +0100, Mathieu Malaterre wrote:
> On Thu, Dec 22, 2011 at 8:52 PM, Sarah Sharp
> <sarah.a.sharp@linux.intel.com> wrote:
> > On Thu, Dec 22, 2011 at 04:18:56PM +0100, Mathieu Malaterre wrote:
> >> On Fri, Dec 16, 2011 at 11:27 AM, Jonathan Nieder <jrnieder@gmail.com> wrote:
> >> System: Dell System Vostro 3750 / Portable Computer
> >>
> >> Ok. So I am running: 3.2.0-rc4-amd64 from debian experimental.
> >>
> >> No mouse plugged to USB 2.0/3.0 interface: boot is fine
> >> Mouse plugged to USB 2.0 interface: boot is fine
> >> Mouse plugged to USB 3.0 interface: boot simply stops
> >
> > Does the boot stop when you have a non-HID USB device plugged into the
> > USB 3.0 port (e.g. hub or flash drive or USB speaker)?  It could be an
> > issue with a buggy BIOS trying to use the mouse and keyboard (HID
> > devices) attached to the USB 3.0 host.  Perhaps it changes the ACPI
> > tables when it tries to use the USB 3.0 host controller, and
> > accidentally overlaps the regions?  But if your keyboard and mouse were
> > under USB 2.0, maybe it will only map in the USB 2.0 host controller.
> 
> I tried booting kernel 3.0.2 (debian/unstable 3.2.0-rc4-amd64) with a
> USB key plugged into USB 3.0 and was stuck again. So I can confirm
> that with a normal USB key (non-HID) plugged in USB 3.0 port, makes
> the kernel refuse to boot.

Please try a USB hub as well.  It's possible the BIOS is trying to read
from the flash drive (which is what I assume you mean by USB key).

> >> As suggested by Jonathan N. [1] here is what I did next:
> >>
> >> $ cat /etc/modprobe.d/mm-blacklist-xhci.conf
> >> blacklist xhci_hcd
> >> $ update-initramfs -u -k all
> >> $ sudo reboot
> >
> > Were you blacklisting xhci only because of the "xhci_hcd 0000:03:00.0:
> > WARN: Stalled endpoint" messages?  Because those messages are harmless,
> > and don't mean anything is *wrong* with the host controller.
> 
> I simply blindly follow the suggestion.

Yeah, don't try to blacklist xhci-hcd.  It's not useful.

> > Even if there's no xHCI driver loaded, it seems that ACPI is noticing
> > the conflict between the PCI registers and another region.  So unloading
> > the xHCI driver won't help your system boot.  You'd need to get a fix
> > into the ACPI subsystem to work around the conflict.  I don't think any
> > xHCI driver modification can help here.
> 
> Is there a way to check if bug is related to ACPI or rather USB 3.0 ?

The log messages seem to indicate that it's either an ACPI or a BIOS
issue.  I really can't suggest any other tests without some input from
the ACPI folks.  The best solution I can suggest is not boot with a USB
device plugged into your USB 3.0 port.

Sarah Sharp
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