there is a time out wake lock (1 sec) that gets grabbed at the end of the pm_suspend code path path (I think). (you'll have to look in your specific kernel version for it)
Someone needs to grab a wake lock in user mode or echo on before that wake lock times out or you go back to sleep. This is by design. (and it has been oh-so-much-fun to discuss on linux-pm in the past) User mode should be grabbing a wake lock under this implementation to hold off subsequent sleeps. --mark On Wed, Mar 28, 2012 at 2:40 PM, Ventanas <guerreromarc...@gmail.com> wrote: > I have been working with a linux kernel 2.6.29 and I now have > implemented the suspend/resume for my machine based on PXA310. > > So I can put Android into suspend by typing 'echo mem > /sys/power/ > state', so I can wakeup the machine from suspend by a trigger (i.e. > hardware on-off button) and Android wakes up for some seconds and goes > again back to suspend, showing these messages over the serial port: > > wakeup wake lock: mmc_delayed_work > wake_lock: mmc_delayed_work, type 0 > > wake_lock: mmc_delayed_work, type 0, timeout 0.500 > wake_lock: mmc_delayed_work, start expire timer, 64 > suspend: exit suspend, ret = 0 (2000-01-01 00:01:52.743408205 UTC) > expire_wake_locks: start > wake lock mmc_delayed_work, expired > expired wake lock mmc_delayed_work > > expire_wake_locks: done, has_lock 0 > suspend: enter suspend > PM: Syncing filesystems ... done. > Freezing user space processes ... (elapsed 0.00 seconds) done. > Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done. > Suspending console(s) (use no_console_suspend to debug) > > anyone knows why?? > > if I am able to type 'echo on > /sys/power/state' over the serial port > just one second after the device resumes from suspend, then the > ANDROID wakes and stays on and it doesn't get back to suspend. > > Why? > > help me, help me....!!!! > > Marco > > -- > unsubscribe: android-kernel+unsubscr...@googlegroups.com > website: http://groups.google.com/group/android-kernel -- create interesting things. -- unsubscribe: android-kernel+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-kernel
