On 04/27/2013 09:21 PM, Max Liao wrote:
I was porting Android 4.0.4 to a board, and the kernel is based on
linux-3.6.9.
According to the usage of android wakelocks,
if I input
echo asdf > /sys/power/wake_lock
and then input
echo mem > /sys/power/state
the system won't suspend and sleep.
But actually not!
The console print following infos:
# echo asdf > /sys/power/wake_lock
# echo mem > /sys/power/state
PM: Syncing filesystems ... done.
Freezing user space processes ... (elapsed 0.01 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.
Suspending console(s) (use no_console_suspend to debug)
It means the system suspends and sleeps.
I don't know why, can anyone help me?
So the current wakelocks code doesn't prohibit explicit suspends from
the sys/power/state interface, but instead they block the autosleep code
from putting the system to sleep, if its enabled.
See:
https://lwn.net/Articles/479841/
and:
Documentation/ABI/testing/sysfs-power
thanks
-john
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