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    SubjectRe: [linux-pm] [PATCH 0/8] Suspend block api (version 8)
    On Thu, May 27, 2010 at 10:37:51PM +0100, Alan Cox wrote:
    > On Thu, 27 May 2010 18:25:10 +0100
    > Matthew Garrett <mjg59@srcf.ucam.org> wrote:
    > > How (and why) does the WoL (which may be *any* packet, not just a magic
    > > one) turn the screen back on?
    >
    > Well on my laptop today it works like this
    >
    > A WoL packet arrives
    > The CPU resumes
    > Depp process, chipset and laptop BIOS magic happens
    > The kernel gets called
    > The kernel lets interested people know a resume occurred

    No it doesn't. The kernel continues executing anything that was on the
    runqueue before the scheduler stopped. If you're using idle-based
    suspend then there's nothing on the runqueue - the application that
    should be scheduled because of the event is blocked on writing to the
    screen.

    --
    Matthew Garrett | mjg59@srcf.ucam.org


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