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    SubjectRe: Suspend/resume regressions on Lenovo S10-3
    Hi Dave,

    On 06/06/2012 06:21 PM, Deepthi Dharwar wrote:

    > On 05/28/2012 07:23 AM, Dave Hansen wrote:
    >
    >> I have a Lenovo S10-3 Atom netbook. It's always had some amount of
    >> trouble working with the intel_idle driver, so I usually compile that
    >> out an use the acpi one.


    What problem did you face with intel_idle driver? Is it suspend/resume
    related?

    I see a comment in drivers/idle/intel_idle.c such as:

    /*
    * Known limitations
    * [...]
    *
    * ACPI has a .suspend hack to turn off deep c-statees during suspend
    * to avoid complications with the lapic timer workaround.
    * Have not seen issues with suspend, but may need same workaround here.
    *
    */

    So, if you are facing suspend issues with the intel_idle driver, we probably
    need to add that same workaround here as well, to make it work.

    Please let us know what problem you are facing.

    Regards,
    Srivatsa S. Bhat

    >> However, just after 3.1, suspend/resume broke.
    >> 'echo mem > /sys/power/state' would hang before suspending. I bisected
    >> it down to the commits around:
    >>
    >> e978aa7d7d57d04eb5f88a7507c4fb98577def77 / v3.1-1-ge978aa7
    >>
    >> by Deepthi. But, current mainline (v3.4-07644-g07acfc2) hangs with a
    >> different symptom: it suspends, but hangs on resume from suspend. I
    >> think _that_ delta in the behavior was caused by:
    >>
    >> 3439a8da16bcad6b0982ece938c9f8299bb53584
    >>
    >> ACPI / cpuidle: Remove acpi_idle_suspend (to fix suspend
    >> regression)
    >>
    >> It's a bit of a pain to bisect these two different things in parallel.
    >> I was trying to tell git bisect 'good' on working suspend/resume, 'bad'
    >> on the hang during resume, and 'skip' on the hangs _during_ suspend. 83
    >> kernels in, I'm not sure that's working very well. :)
    >>
    >> Deepthi, do you have any idea why your patches broke me in the first
    >> place? Perhaps we should fix that regression first before we go on and
    >> try to figure out what changed to let it suspend again, but break later.
    >
    >
    > Hi Dave,
    >
    > Sorry about my patches breaking your suspend-resume.
    >
    > I, basically tried out building and booting 3.1 kernel with
    > my patch set to reproduce the failure. I could clearly
    > see suspend not happening. It turns out to be
    > a bug with my first patch in global registration
    > series submitted earlier.
    >
    > e978aa7d7d57d04eb5f88a7507c4fb98577def77 / v3.1-1-ge978aa7
    >
    > The following patch, fixes the suspend issues
    > seen on my laptop due to earlier cpuidle cleanup
    > (Lenevo T420 booting with acpi_idle enabled).
    > Can you please give this a try
    > on top of my patch set (without Rafael's fix)
    > and see if it fixes the problem for you.
    > I am not reverting acpi_idle_suspend flag and
    > hopefully it should resume fine too.
    >
    > ---
    >
    > This patch fixes suspend-resume issue seen in the kernel 3.1
    > series using acpi_idle_driver because of cpuidle global
    > registration cleanup.
    > Here, when acpi_idle_suspend flag was set ( during suspend)
    > the interrupts were not getting enabled in acpi_idle_enter_bm()
    > routine which was causing the system to hang.
    >
    >
    > Signed-off-by: Deepthi Dharwar <deepthi@linux.vnet.ibm.com>
    >
    > ---
    > drivers/acpi/processor_idle.c | 3 ++-
    > 1 files changed, 2 insertions(+), 1 deletions(-)
    >
    > diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
    > index 24fe3af..6e35293 100644
    > --- a/drivers/acpi/processor_idle.c
    > +++ b/drivers/acpi/processor_idle.c
    > @@ -895,8 +895,9 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
    > if (unlikely(!pr))
    > return -EINVAL;
    >
    > -
    > if (acpi_idle_suspend) {
    > + local_irq_disable();
    > + local_irq_enable();
    > cpu_relax();
    > return -EINVAL;
    > }
    >
    > Cheers,
    > Deepthi
    >



    --
    Regards,
    Srivatsa S. Bhat
    IBM Linux Technology Center



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