proposal: set default lid state to S3, performance/economy Cx states to Cmax

[Adrian Chadd]

On 5 May 2014 08:09, John Baldwin <jhb at freebsd.org> wrote:
> On Sunday, May 04, 2014 4:27:38 am Adrian Chadd wrote:
>> Hi,
>>
>> I'd like to propose flipping a few things:
>>
>> * Flipping the default lid state to S3. I think ACPI suspend/resume
>> seems to work well enough these days and I've not met anyone lately
>> who expects the default from their laptop to be "stay awake with the
>> lid shut."
>> * Save chip bugs that we should add workarounds for, we should be OK
>> to enter lower sleep states when idling. Flipping this may expose some
>> further crazy driver, platform or timer bugs, but they again likely
>> should be fixed.
>>
>> what do people think?
>
> I think the lid switch thing is premature.  Even on my X220 I use a devd
> hook to enable it only when i915drm is loaded as resume doesn't work until
> that is done.
>
> I think the Cmax thing OTOH is probably more appropriate.  We have several
> things place that should "mostly" DTRT for picking the correct timers to
> use.  The one case I know of recently were some somewhat older systems where
> the HPET wasn't reliable, but the system chose to use HPET instead of LAPIC
> becuase the LAPIC was known to stop during C1E, etc.  In this case the user
> just stuck with plain old C1 and forced the LAPIC timer which worked fine.
> However, it is hard to identify those cases.  On modern systems I would
> expect the LAPIC to work just fine, so this problem will become less and
> less important as time goes on.

right. I'd rather we start finding more of these sooner rather than later. :-)



-a