Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: 2.6.25-rc2 System no longer powers off after suspend-to-disk. Screen becomes green. | Date | Fri, 22 Feb 2008 18:44:30 +0100 |
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On Friday, 22 of February 2008, Mark Lord wrote: > Rafael J. Wysocki wrote: > > On Friday, 22 of February 2008, Mark Lord wrote: > >> david@lang.hm wrote: > >> .. > >>> I've been watching for kexec hibernate for a little while now, and the > >>> last I saw was that acpi was incompatible with the kexec hibernate (but > >>> the suspend folks were still claiming that devices needed to be put in > >>> the 'right mode' not just powered off. I've been waiting to see this > >>> resolved. > >> .. > >> > >> Yeah, exactly. What's so special about poweroff on hibernation? > >> Why even bother with the special "S4" state there? > > > > (1) To be able to wake up with the help of devices that can't wake > > the system up from S5 (power off) > > (2) To handle some platform devices appropriately over the cycle > .. > > That's the theory. I've read about it, but have yet to imagine > any real-life situation where it applies. > > But this isn't my speciality, so.. do you have experience with any real examples?
Yup. The fan in my notebook behaves incorrectly after a resume from hibernation if S5 is entered instead of S4 during it.
I don't know why exactly it happens, but that's how it goes.
Also, some machines are reported to behave incorrectly after a "shutdown" mode hibernation, while the same machines work just fine after a "platform" mode hibernation. So at least for these machines it seems to matter.
Thanks, Rafael
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