Why does my external display go to sleep when opening an X11 window?

I'm on a 27in late 2012 iMac with Yosemite. I recently added an external monitor connected through one of the Thunderbolt ports (with a VGA adapter). I use X11 frequently - when I open an X11 program in the external monitor or drag an X11 window into that space, much of the time the display goes to sleep immediately, until I either drag the window back out or exit X11. Does anybody know why this is happening? Sometimes I can open X11 applications right through terminal in the new display, but even then they frequently look unstable, flashing and blinking.
Thank you!

Try resetting PRAM and SMC.
Reset PRAM: http://support.apple.com/kb/PH14222
Reset SMC. http://support.apple.com/kb/HT3964
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"Resetting SMC on portables with a battery you should not remove on your own".

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Date: Sun, 10 Nov 2013 08:54:35 -0800
From: [email protected]
To: [email protected]
Subject: why does lightroom not display photos ?
    Re: why does lightroom not display photos ?
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Why does my external display go to sleep when opening an X11 window?

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