On Friday, 22 of February 2008, david@xxxxxxx wrote: > On Fri, 22 Feb 2008, Rafael J. Wysocki wrote: > > > 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. > > so if you power off your laptop the fan doesn't work when you turn it back > on????? No, it works fine then. > > 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. > > given that we don't have a pure "shutdown" option available to try I don't > see how this can be said to have been tested. Yes, we have. > currently any attempts to do a shutdown type hibernate are tangled in the > other code that is there for the suspend modes. this makes it _very_ hard > to say that the hardware requires something as opposed to the strong > possibility that the software is doing something wrong. How is it tangled exactly? > there are also a _lot_ of people who are not able to reliably use the > existing "platform" mode hibernation, so it's not a fair statement to say > that it's the 'right' thing to do. If you want to make it an option, fine. > But please give those of us who don't care about these other wakeup > options, and who want to be able to use other OS's while linux is stopped > an option as well. There is such an option. Put # echo shutdown > /sys/power/disk into the init scripts and it will do the trick. 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
