Yosemite Won't Shutdown With External Monitor Connected

Hi there...
I have a MBP 2010 and I've updated Yosemite from Mavericks. Now I'm running the latest 10.10.2.
Ever since I updated to Yosemite, I have had this problem of my computer won't shutdown when an External monitor is connected. This happens only when I put my computer to sleep.However, if I restart the computer and after logged in to the user and tried to shutdown, it shutdown without any problem. Every time I shutdown it just hangs and I had to force shutdown by press and hold the power button. Which I'm sure is not a proper way.
Right now only my external monitor connected to my MBP. So I did unplugged the ext. monitor and tried shutdown and it works fine. But it think this is the temporary solution that I've found but it is annoying to unplug everytime I wanted to shutdown and plug it back in once the computer is up and running. Which is not idle solution at all.
Am I the only one or a lot of people facing this issue? If there is a solution please share. Very much appreciated. Thanks.

Updated to 10.10.3 and the problem still persist. Still unable to shutdown or restart after wake up from sleep.
Any one affected? Is it something to do with Gfx card?

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