External display prevents MBP from sleeping.

I have a Mid 2012 Macbook Pro (Yosemite 10.10.1) with a ASUS VS247 display connected via HDMI to Thunderbolt using an AmazonBasics Mini DisplayPort to HDMI adapter. When I put the MBP to sleep (closing lid or selecting Sleep from the Apple menu) it is never able to fully sleep due to wake ups from EC.DisplayDetach/Maintenance. Below I have pasted the results from pmset -g log. You can see the wake ups (DarkWake DarkWake [CDN] due to EC.DisplayDetach/Maintenance) occurring approximately every 30 secs to min. These wakeups during "sleep" do not occur if I don't have the external display connected. Has anyone experienced a similar problem and have a solution? Does anyone have a similar configuration, but does not experience this issue? Any help is appreciated.
2015-01-02 19:34:07 -0600 Sleep               Entering Sleep state due to 'Software Sleep pid=65': Using BATT (Charge:99%) 34 secs 
2015-01-02 19:34:10 -0600 PM Client Acks      Delays to Sleep notifications: [com.apple.apsd is slow(3096 ms)]         
2015-01-02 19:34:35 -0600 Kernel Client Acks  Delays to Sleep notifications: [powerd is slow(3099 ms)] [BroadcomBluetoothHostControllerUSBTransport driver is slow(msg: WillChangeState to 2)(337 ms)] [AppleThunderboltNHIType1 driver is slow(msg: WillChangeState to 2)(2073 ms)]         
2015-01-02 19:34:41 -0600 DarkWake            DarkWake [CDN] due to EC.DisplayDetach/Maintenance: Using BATT (Charge:99%) 0 secs  
2015-01-02 19:34:41 -0600 Kernel Client Acks  Delays to Wake notifications: [en0 driver is slow(msg: DidChangeState to 2)(1095 ms)]         
2015-01-02 19:34:41 -0600 Sleep               Entering Sleep state due to 'Maintenance Sleep': Using BATT (Charge:99%)   24 secs 
2015-01-02 19:34:42 -0600 PM Client Acks      Delays to Sleep notifications: [discoveryd is slow(280 ms)] [com.apple.apsd is slow(1455 ms)]         
2015-01-02 19:34:56 -0600 Assertions          PID 50(apsd) Released ApplePushServiceTask "com.apple.apsd-lastpowerassertionlinger" 00:00:13  id:0xb000001a4 [System: No Assertions]        
2015-01-02 19:34:56 -0600 Assertions          PID 50(apsd) Released ApplePushServiceTask "com.apple.apsd-datareceived-push.apple.com" 00:00:12  id:0xb000001a7 [System: No Assertions]        
2015-01-02 19:34:59 -0600 Kernel Client Acks  Delays to Sleep notifications: [BroadcomBluetoothHostControllerUSBTransport driver is slow(msg: WillChangeState to 2)(355 ms)]         
2015-01-02 19:35:05 -0600 DarkWake            DarkWake [CDN] due to EC.DisplayAttach/Maintenance: Using BATT (Charge:99%) 0 secs  
2015-01-02 19:35:05 -0600 Kernel Client Acks  Delays to Wake notifications: [en0 driver is slow(msg: DidChangeState to 2)(1273 ms)]         
2015-01-02 19:35:05 -0600 Sleep               Entering Sleep state due to 'Maintenance Sleep': Using BATT (Charge:99%)   30 secs 
2015-01-02 19:35:07 -0600 Assertions          PID 50(apsd) Released ApplePushServiceTask "com.apple.apsd-waitingformessages-push.apple.com" 00:00:24  id:0xb000001a9 [System: No Assertions]        
2015-01-02 19:35:09 -0600 PM Client Acks      Delays to Sleep notifications: [com.apple.apsd is slow(4217 ms)]         
2015-01-02 19:35:29 -0600 Kernel Client Acks  Delays to Sleep notifications: [powerd is slow(3039 ms)] [BroadcomBluetoothHostControllerUSBTransport driver is slow(msg: WillChangeState to 2)(355 ms)]         
2015-01-02 19:35:35 -0600 DarkWake            DarkWake [CDN] due to EC.DisplayDetach/Maintenance: Using BATT (Charge:98%) 0 secs  
2015-01-02 19:35:35 -0600 Kernel Client Acks  Delays to Wake notifications: [en0 driver is slow(msg: DidChangeState to 2)(1277 ms)]         
2015-01-02 19:35:35 -0600 Sleep               Entering Sleep state due to 'Maintenance Sleep': Using BATT (Charge:98%)   33 secs 
2015-01-02 19:35:38 -0600 PM Client Acks      Delays to Sleep notifications: [com.apple.apsd is slow(2913 ms)]         
2015-01-02 19:36:02 -0600 Kernel Client Acks  Delays to Sleep notifications: [BroadcomBluetoothHostControllerUSBTransport driver is slow(msg: WillChangeState to 2)(360 ms)]         
2015-01-02 19:36:08 -0600 DarkWake            DarkWake [CDN] due to EC.DisplayDetach/Maintenance: Using BATT (Charge:98%) 0 secs  
2015-01-02 19:36:08 -0600 Kernel Client Acks  Delays to Wake notifications: [en0 driver is slow(msg: DidChangeState to 2)(720 ms)]
2015-01-02 19:36:08 -0600 Sleep               Entering Sleep state due to 'Maintenance Sleep': Using BATT (Charge:98%)   32 secs 
2015-01-02 19:36:11 -0600 PM Client Acks      Delays to Sleep notifications: [com.apple.apsd is slow(3260 ms)]         
2015-01-02 19:36:34 -0600 Kernel Client Acks  Delays to Sleep notifications: [powerd is slow(3263 ms)] [BroadcomBluetoothHostControllerUSBTransport driver is slow(msg: WillChangeState to 2)(357 ms)]         
2015-01-02 19:36:40 -0600 DarkWake            DarkWake [CDN] due to EC.DisplayDetach/Maintenance: Using BATT (Charge:98%) 0 secs  
2015-01-02 19:36:40 -0600 Kernel Client Acks  Delays to Wake notifications: [en0 driver is slow(msg: DidChangeState to 2)(963 ms)]         
2015-01-02 19:36:40 -0600 Sleep               Entering Sleep state due to 'Maintenance Sleep': Using BATT (Charge:98%)   33 secs 
2015-01-02 19:36:43 -0600 PM Client Acks      Delays to Sleep notifications: [com.apple.apsd is slow(3390 ms)]         
2015-01-02 19:37:06 -0600 Kernel Client Acks  Delays to Sleep notifications: [powerd is slow(3047 ms)] [BroadcomBluetoothHostControllerUSBTransport driver is slow(msg: WillChangeState to 2)(352 ms)]         
2015-01-02 19:37:13 -0600 DarkWake            DarkWake [CDN] due to EC.DisplayDetach/Maintenance: Using BATT (Charge:98%) 0 secs  
2015-01-02 19:37:13 -0600 Kernel Client Acks  Delays to Wake notifications: [en0 driver is slow(msg: DidChangeState to 2)(1870 ms)]         
2015-01-02 19:37:13 -0600 Sleep               Entering Sleep state due to 'Maintenance Sleep': Using BATT (Charge:98%)   1 secs  
2015-01-02 19:37:13 -0600 Notification        Display is turned on                                                               
2015-01-02 19:37:14 -0600 Wake                Wake [CDNVA] due to EC.DisplayDetach/HID Activity: Using BATT (Charge:98%)         
2015-01-02 19:37:14 -0600 Kernel Client Acks  Delays to Wake notifications: [AppleHDADriver driver is slow(msg: SetState to 1)(410 ms)] [NVDA driver is slow(msg: SetState to 2)(424 ms)] [AppleIntelFramebuffer driver is slow(msg: SetState to 2)(425 ms)] [AppleHDADriver driver is slow(msg: SetState to 1)(477 ms)]         
2015-01-02 19:37:17 -0600 PM Client Acks      Delays to Sleep notifications: [discoveryd is slow(1465 ms)] [com.apple.apsd is slow(4099 ms)]         
Total Sleep/Wakes since boot at 2015-01-02 19:31:24 -0600 :7
2015-01-02 19:37:35 -0600 :Showing all currently held IOKit power assertions
Assertion status system-wide:
   BackgroundTask                 0
   ApplePushServiceTask           0
   UserIsActive                   0
   PreventUserIdleDisplaySleep    0
   PreventSystemSleep             0
   ExternalMedia                  0
   PreventUserIdleSystemSleep     0
   NetworkClientActive            0
Kernel Assertions: 0x4=USB
   id=500  level=255 0x4=USB mod=1/2/15, 7:36 PM description=XHC1 owner=AppleUSBXHCI

I'd kinda like to just close her up and walk away, rather than having to drag the drive to the trash, wait, unplug, then close her up and walk away.
Francis

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