Suspend to RAM
Ernie McCracken
holycrap at cavtel.net
Wed Dec 15 21:28:32 UTC 2004
On Wed, Dec 15, 2004 at 11:15:38AM -1000, Amy M wrote:
> Looks like you may be the Savior. Any info that will help me do the
> suspend to RAM in FC3 will be greatly appreciated.
>
> I have an HP ze4560 notebook. The only way I was able to cause it to
> hibernate (suspend to RAM) was to issue a command:
>
> echo 4 > /proc/acpi/sleep
I think that ACPI state 4 is for "suspend to disk" (i.e., hibernation).
I think you want state 3, which is suspend to RAM (i.e., standby).
See here: http://acpi.sourceforge.net/documentation/sleep.html
>
> But as everyone would have guessed, with this command (and nothing
> else), I would not able to wake the machine up after I put it into
> hibernation.
I put this in a shell script that runs when I close the lid of my
laptop.
In /etc/acpi/events/sample.conf, I put this:
event=button/lid.*
action=/usr/local/t40suspend.sh
The contents of t40suspend.sh are as follows:
echo -n "mem" > /sys/power/state && hwclock --hctosys
echo -n "mem" > /sys/power/state is the equivalent of echo 3 >
/proc/api/sleep
hwclock --hctosys sets the system time from the hardware clock.
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