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    SubjectRe: APM shutdown oops (Re: [stable] [patch 09/12] Fix SMP poweroff hangs)
    On Thu, Oct 11, 2007 at 02:42:01PM -0400, Jeff Garzik wrote:
    > Linus Torvalds wrote:
    >> On Wed, 10 Oct 2007, Kevin wrote:
    >>> The last kernel I used was 6.2.22 the "dmesg" the file is attached:
    >>> dmesg 2.6.22 line 158 > apm: overridden by ACPI.
    >>> dmesg, APM on, has no line > apm: overridden by ACPI.
    >> Ok, this is the real reason. The APM code does:
    >> if (PM_IS_ACTIVE()) {
    >> printk(KERN_NOTICE "apm: overridden by ACPI.\n");
    >> apm_info.disabled = 1;
    >> return -ENODEV;
    >> }
    >> and in previous kernels that would notice that you have ACPI enabled, and
    >> APM gets shut out, and you never see your buggy APM BIOS.
    >> In 2.6.23, this apparently doesn't happen for some reason.
    >> And I think I see the problem: it's a config change. You don't have
    >> PM_LEGACY enabled. Your config file diff shows:
    >> +# CONFIG_PM_LEGACY is not set
    >> I suspect we should make CONFIG_APM either depend on, or select,
    >> PM_LEGACY. But as far as I can see, nothing has actually changed in this
    >> area in the kernel, and this bug has been there before - just your config
    >> change made it appear. Rafael? Stephen? Opinions? I'd think that making
    >> APM depend on CONFIG_PM_LEGACY is the right thing to do these days..
    > Speaking as the author of
    > [PATCH] move pm_register/etc. to CONFIG_PM_LEGACY, pm_legacy.h
    > I agree. arch/i386/kernel/apm.c clearly requires include/linux/pm_legacy.h
    > and the legacy PM API.
    > I would vote for a dependency rather than select, but don't have any strong
    > feelings on the matter...

    It should be a select since a dependency would make it needlessly hard
    for kconfig users to find the APM option.

    > Jeff



    "Is there not promise of rain?" Ling Tan asked suddenly out
    of the darkness. There had been need of rain for many days.
    "Only a promise," Lao Er said.
    Pearl S. Buck - Dragon Seed

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