Re: Hotplug events for system suspend/resume

[Nigel Cunningham]

Hi.

On Wed, 12 May 2004 12:44, Todd Poynor wrote:
> The patch hooks into the power subsystem prior to freezing processes and
> after unfreezing processes, so I don't think it's a concern (unless
> something is using the power subsystem rather oddly).  This patch sends
> a single notification of system suspend and a single notification of
> system resume, in case there's any confusion with the individual device
> state change notifiers also recently discussed.  It's been run
> successfully on one ACPI system and one non-ACPI system.

Great.

> > In my mind, this approach is simpler and makes more sense: userspace
> > should worry about userspace actions related to suspending before calling
> > kernelspace. Kernel space should then only worry about saving and
> > restoring driver states and should be transparent to user space. ...
>
> Agreed, with the minor reservations listed in a previous email (suspend
> initiated by drivers must coordinate ad-hoc with userspace, etc.).

You're thinking ACPI drivers initiating a suspend? They would do it through 
acpid, wouldn't they? At least that's the glue I use to get my sleep button 
to initiate a suspend. I would assume thermal events would/should work the 
same.

> I'll let anybody who cares more deeply about this speak up now,
> otherwise this isn't a battle I'll be fighting on behalf of others any
> more.  Thanks -- Todd

:> I wasn't meaning to make it a battle!

Nigel

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