Display sleep not following preference setting

Hi,
On my MacBook Pro I have set the energy saving preference to never let the display go to sleep. However, every 5 minutes or so the display does go to sleep. I have tried resetting the SMC and NVRAM but it has had no effect.
Is there anything else I can try? Does anybody know which file holds the energy saver preferences? Perhaps I could try deleting that? Any other suggestions?
S

As phrased, I have the same issue, after upgrading to Yosemite, but the symptoms are exactly the opposite. My settings are set to put the display to sleep after 10 minutes, but it no longer auto-sleeps, ever. It will sleep and stay sleeping only when I manually put it in sleep mode.
MacBook Pro (Retina, 13-inch, Late 2013)
16GB Memory
251 GB Flash Storage
Apple Thunderbolt Display
Processor Name: Intel Core i5
Processor Speed: 2.4 GHz
Number of Processors: 1
Total Number of Cores: 2
L2 Cache (per Core): 256 KB
L3 Cache: 3 MB
Memory: 16 GB
Boot ROM Version: MBP111.0138.B11

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Thank you for visiting Apple Support Communities.
Here are a couple articles that I would take a look at when experiencing this issue.
OS X Mountain Lion: If your Mac won’t go to or stay in sleep
http://support.apple.com/kb/PH11080
Mac OS X: Why your Mac might not sleep or stay in sleep mode
http://support.apple.com/kb/HT1776
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Display sleep not following preference setting

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