Fermi AGPM with dual monitors broken

[Hurrian]

I'm running a GTX 580 on my machine, and picked up a second monitor recently.

 

I noticed that when I plug in the second monitor, my GPU goes all the way up to the max speed even if I'm just browsing/listening to music/etc. Heard that it was "by design" - naturally rendering two monitors would take some more power, but I didn't think it'd burn that much power.

 

Clock speeds remain stuck after unplugging the second monitor.

 

How can I return clock speed to normal? For reference, here's my current AGPM config.

<key>Vendor10deDevice1080</key>
<dict>
<key>Heuristic</key>
<dict>
<key>ID</key>
<integer>0</integer>
<key>IdleInterval</key>
<integer>250</integer>
<key>SensorOption</key>
<integer>1</integer>
<key>SensorSampleRate</key>
<integer>4</integer>
<key>TargetCount</key>
<integer>5</integer>
<key>Threshold_High</key>
<array>
<integer>25</integer>
<integer>75</integer>
<integer>90</integer>
<integer>100</integer>
</array>
<key>Threshold_Low</key>
<array>
<integer>0</integer>
<integer>97</integer>
<integer>97</integer>
<integer>98</integer>
</array>
</dict>
<key>LogControl</key>
<integer>1</integer>
<key>control-id</key>
<integer>18</integer>
</dict>