On Sun, Oct 31, 2010 at 12:48 PM, wu zhangjin <wuzhang...@gmail.com> wrote:
> On Sun, Oct 31, 2010 at 11:56 PM, Daniel Clark <dcl...@pobox.com> wrote:
> >> 2. Do hibernation
> >>
> >> $ echo disk > /sys/power/state
> >
> > Is the thing with the disk hibernation not being that useful due to a fan
> > staying on (in a way that would need to be fixed in hardware) somehow
> fixed
> > now, either by a clever software hack or a hardware change in more recent
> > production yeeloongs?
>
> For the FAN problem, do you mean "suspend to RAM"(echo mem >
> /sys/power/state)?
>
> Hibernation(Suspend to disk, "echo disk > /sys/power/state") doesn't
> have this problem for it will turn off the whole machine.
>
> "Suspend to RAM" will not turn off the FAN for currently, "Suspend to
> RAM" doesn't function completely, which means even if we suspend the
> system to RAM, some of the external devices can not be turned off(for
> hardware problems, no hardware interfaces to turn them off),
> therefore, we still need the FAN to ensure the temperature is not too
> high, otherwise, you may potentially get a broken machine.
>
> Although we can turn off the FAN via the software interface(with the
> help of the yeeloong_laptop module):
>
> // Enable the manual mode of the Fan: 0 full speed; 1 manual; 2
> auto(default)
> echo 1 > /sys/devices/virtual/hwmon/hwmon0/pwm1_enable
> // Change the RPM: 0(turn off), 1, 2, 3(default)
> echo 1 > /sys/devices/virtual/hwmon/hwmon0/pwm1
>
> But to consider the hardware safety, we'd better keep the FAN works in
> auto mode: in this mode, it can adjust its speed automatically based
> on the external temperature.
>
> So, I think hibernation is better than "Suspend to RAM" although we
> may need more time to do it(several seconds). But if you don't care
> for the power consumption, please use "Suspend to RAM" instead for it
> also save more than 50% power for you, "Suspend to RAM" only need
> about 5 w and the default system need about 12.21 V * 0.93 A = 11.0838
> W (the data is collected by the "sensors" command).
>
> Regards,
> Wu Zhangjin
>
Sorry, my metal error - I wasn't aware that suspend to disk was ever broken,
so when I saw it mentioned that some kind of suspend/hibernate was broken, I
immediatly thought it was the suspend-to-RAM with the fan issue. So
nevermind, and sorry for any confusion my post caused.
--
\|/ Daniel JB Clark | Activist; Owner
FREEDOM -+-> INCLUDED ~ http://freedomincluded.com
/|\ Free Software respecting hardware
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