How do I stop Automatic Graphics Switching setting automatically reverting

Macbook Pro 15" Mid 2010
OS X 10.7.4
I have a recurring problem where my screen (built in or external monitor/projector) will just go blank at random times. It is an unrecoverable situation and I have to do a hard power reset to get working again.
After testing several theories without success I struck upon one that showed promise. The blanking tended to occur when I was in Lion Fullscreen mode, or using a gesture to start expose - so I figured maybe it was a graphics switching issue.
So I went into System Preferences and disabled 'Automatic graphics switching'. I then ran trouble free for several days (I was typically crashing 1-2 times a day)
Then several days later it happened again and I thought I was back to square one. However, a colleague suggested I check the graphic switching setting to see if something had changed it back, and sure enough it was re-enabled.
Now I find myself in a constant battle with the system to keep disabling the 'Automatic graphics switrhing' in System Preferences.
I have tried setting it and locking it, but sooner or later it reverts.
I need to know if it is possible to force it to stay disabled.

Nice pace both of you - cheers.
I have downloaded and installed now (cos I implicitly trust all links in forum responses )
Oddly enough, since typing my original question this morning (local time) and installing this little utility this afternoon, the setting had once more reverted to 'enabled' - when I selected discrete in the app it crashed my macbook again, but slightly differently from before in that I got a blue screen (felt like windows again ) rather than a blank powered off one.
Anyway, I have restarted now, and set it again - I'll stick with it for a few days and return with likes/+1/stars etc if it all pans out.
Cheers again.

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