OS X: My screen isn't going to sleep.

Strange problem,  for some reason my iMac (running Lion) display was not going to sleep after the preset time.   I tried playing around with both the screen saver and power settings and I couldn't get it to go into sleep.

a hint from here: http://apple.stackexchange.com/questions/16306/why-is-the-screen-saver-not-kicking-in solved the issue.

Summary:

from the terminal run 'pmset -g',  the output looks like:

$ pmset -g
Active Profiles:
AC Power        -1*
Currently in use:
 autorestart    0
 powerbutton    1
 halfdim    1
 panicrestart    157680000
 hibernatefile    /var/vm/sleepimage
 networkoversleep    0
 disksleep    10
 sleep        0
 hibernatemode    0
 ttyskeepawake    1
 displaysleep    15 (imposed by 2319)
 womp        0

The process '2319' on the displaysleep line is the problem.



A quick 'ps' and we can find out what the process is:

$ ps -fea | grep 2319
    root  2319     1  0   Sep 02 ?        0:04 /System/Library/CoreServices/RemoteManagement/screensharingd.bundle/Contents/Ma

hmm,  no idea what the process is but what the heck,  kill it with:

$ sudo kill -9 2319

And the problem is solved.

What I think happened is that I had an aborted remote desktop from my macbook and it left this process 'stuck'.   There was very little cpu usage and everything is working find now.