Re: [acpi-jp 2746] Re: ACPI, USB, and the tangled web

From: Anish Mistry (mistry.7_at_osu.edu)
Date: 10/17/03

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    To: acpi-jp@jp.FreeBSD.org
Date: Fri, 17 Oct 2003 16:43:52 -0400

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    On Friday 17 October 2003 01:25 pm, Nate Lawson wrote:
    >
    > The problem is USB although ACPI magnifies it. USB devices can generate
    > wake events. In my current testing of a new acpi_cpu driver, I've found
    > that just having the USB bus enabled in the kernel (with no devices
    > attached) causes it to generate a steady stream of bm_sts sets even though
    > the laptop is completely idle. Try disabling usb in your kernel config
    > and see if it helps your laptop not wake up. If that works, we've
    > narrowed it down a little. You can also try setting debug.acpi.avoid to
    > USB_ to try to get it to avoid evaluating that namespace.
    >
    USB isn't enabled in the kernel config, it was load via module. This problem
    only happens after the first suspend and only when the USB module is loaded,
    but a similar to my sleep_delay (http://www.freebsd.org/cgi/
    query-pr.cgi?pr=56394) problem, the system always suspends once ok, but
    subsequent with both USB(only when being accessed) and sleep_delay cause
    reboots. Setting debug.acpi.avoid to USB_ didn't make any difference. When
    I was trying to debug these issues a month ago I remember it rebooting always
    sometime after the AcpiEnterSleepStatePrep.
    > I'll probably get around to looking at the USB issue at some point.
    > There's a lot of work needed there: suspend/resume for *hci, possibly
    > avoiding setting acpi wake events on usb, etc.
    >
    > > There seems to be some ACPI problem, since I just tested the same
    procedure
    > > on with ACPI disabled and there was no reboot.
    >
    > How were you able to test that with it disabled? Were you suspending with
    > apm instead?
    >
    Yes.
    > -Nate
    >

    - --
    Anish Mistry
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