MacBook doesn't sleep when closing lid with external monitor attached with Lion

I just upgraded from Snow Leopard to Mavericks on Saturday and discovered this no sleep with lid closed and external monitor connected issue (one of many OS X annoyances/isssues post-Snow Leopard).

I cannot say if unchecking share printers was a factor, but I did that anyway. What did work was doing this:

--disconnect external monitor

--disconnect power cable

--run this line in Terminal: sudo nvram boot-args="iog=0x0"

--restart

--plug back in external monitor and power cable

After I did those steps I could now close the lid of my MacBook Pro (15" mid-2010) and everything would go to sleep as it did in Snow Leopard.

For those of you just accepting having to manually put everything to sleep, that is settling. OS X only continues to get worse, not better. The peak was OS X Tiger, after that changes for just change sake screwed up Spotlight, Expose, then Safari lost RSS, then iTunes lost Party Shuffle, not to mention crop getting screwed up in Aperture.

Anyway, at least if you are a power user and run Terminal you can get your MacBook to perform sleep like it should. It is preposterous to need to run Terminal for that function.

Hello

Finally fixed it!! After reading so many pages including this thead, I went into print and scan features unchecked the "share printer over network option"! It worked!!!

I have observed this same behavior. Just affirming that it is not isolated to this user.

Me too have the same, but I haven't even got a external monitor connected!

I'm getting the same problem with an external monitor connected.

I am having the same problem...you have to manually put it to sleep now. Kind of annoying!

Same here. I have to unplug the monitor cable before I close the lid.

I have this problem, regardless of whether or not my external monitor is connected, also.

I have the same problem with an external monitor attached to my MacBook 13." Hopefully this will be an option in an update

Same problem here. Extremely annoying.

Same here. Won't sleep when I close the lid and have an external monitor (my tv) attached... Lame...

Why? Just why? There should be a setting that allows users to select what happens when the laptop lid is closed.

I have the same problem on my 2011 MBP 15" running 10.7 Lion. Hopefully this gets fixed promptly!

Getting same problem as well. Have to manually sleep macbook pro until they fix this. I don't want the other monitor to be the main display.

Same problem here. this isn't difficult, either apple needs to give us the option, or another programmer should take the initiative to come up with a settings pane to change the behavior.