On Friday, 22 of February 2008, Mark Lord wrote: > Rafael J. Wysocki wrote: > > On Friday, 22 of February 2008, Mark Lord wrote: > >> david@xxxxxxx 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 - To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
