[PC-BSD Testing] PC-BSD 8.1 RC1 - thoughts and ideas

Mike Bybee mbybee at dometrilogy.com
Wed Jul 7 08:05:16 PDT 2010


On Wed, Jul 7, 2010 at 7:50 AM, M. Warner Losh <imp at bsdimp.com> wrote:

> In message: <4C348239.7030704 at pcbsd.org>
>            Kris Moore <kris at pcbsd.org> writes:
> : On 07/07/2010 09:24, Mike Bybee wrote:
> : >
> : >
> : >
> : > I would love to step up and help on the suspend resume and power
> : > management if you can point me in the right direction.
> : >
> : > --
> : > Thanks,
> : > Mike Bybee
> : >
> :
> : Sure!
> :
> : The first thing to do is get yourself subscribed to the freebsd-acpi
> : list:
> :
> : http://lists.freebsd.org/mailman/listinfo/freebsd-acpi
> :
> : That's where you can discuss all things acpi/power management.
> :
> : Next I would e-mail Alexander Motin (mav at freebsd.org). He's been doing
> : some work for us, and knows a lot about the acpi subsystem, and can
> : probably point you in the right direction. He also wrote this nice
> : guide on tuning power consumption which may help you:
> :
> : http://wiki.freebsd.org/TuningPowerConsumption
>
> The biggest problem with suspend/resume today is that most laptops are
> multicore, but the suspend/resume code doesn't know about that.  We
> need to go in and stop all the other CPUs before starting to traverse
> the device tree suspending the devices.  Once we have *that* in place,
> it becomes a battle of attrition to fix and drivers that might be
> broken.
>
> The suspend/resume code can be found in src/sys/dev/acpica/acpi.c
> acpi_EnterSleepState.  While there's some SMP code to pin the thread
> to CPU 0, there's no code to shut off all the other CPUs' scheduling.
>
> The other big ticket item here is the S3 state.  S3BIOS has been
> supported for years.  However, support for the S3 state without BIOS
> intervention has languished.  Writing the dump files is relatively
> straight forward, once you've quiesced the rest of the system, but the
> boot path requires boot loader support, which we don't have.
>
> Warner
> _______________________________________________
> Testing mailing list
> Testing at lists.pcbsd.org
> http://lists.pcbsd.org/mailman/listinfo/testing
>
>

Is that why it's fairly solid on the Linux 2.6 kernel with Grub 2 (like
Ubuntu 10.4, as an example), but so unstable on FreeBSD?

Is there any BSD that *has* a working suspend/resume that we can perhaps use
as a code model?

-- 
Thanks,
Mike Bybee
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