From http://acpi.sourceforge.net/documentation/sleep.html:
/proc/acpi is being replaced by interfaces in /sys and new software
should not look in /proc. Users of 2.6 are advised to use the new file
in sysfs: /sys/power/state.
Metalshark says:
February 15th, 2008 at 6:15 am
In shutdown you use “/proc/acpi/sleep”, would it be advisable to use the
new sysfs method and use that if available and if not use proc (at runtime)
with compile time options to disable proc/sysfs methods?
Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>