Kernel_task high cpu usage when using external monitor at 1080p

Specs
Model Name:          MacBook Pro
Model Identifier:          MacBookPro6,2
Processor Name:          Intel Core i7
Processor Speed:          2.66 GHz
Number Of Processors:          1
Total Number Of Cores:          2
L2 Cache (per core):          256 KB
L3 Cache:          4 MB
Memory:          4 GB
Processor Interconnect Speed:          4.8 GT/s
Boot ROM Version:          MBP61.0057.B0C
SMC Version (system):          1.58f15
My external display is a Samsung PX2370 connected to my MBP using an HDMI cable with a HDMI-to-miniDP adapter
I first noticed this after the last EFI update several months back. At first I thought kernel_task eats up too much cpu cycles whenever an external display is attached, but it turns out this only happens when the external display is set to 1080p. When external display is set to 720p, kernel_task is pretty much normal (~5% cpu usage) but rises up to ~150% cpu usage once the external display is set to 1080p.
kernel_task cpu usage is also with normal range when my MBP is connected to a Samsung LCD TV at 720p.
Anyone having the same problem or know of any fix/workarounds?

Seems like the problem persists when playing a 720p video on the external display set to 720p. To sum it up
Video Resolution
Main Display
External (1280x720)
External (1920x1080)
480p
ok
fluctuating kernel_task cpu usage (~5 to ~150 cpu usage)
high kernel_task cpu usage
720p
ok
high kernel_task cpu usage
high kernel_task cpu usage
1080p
ok
high kernel_task cpu usage
high kernel_task cpu usage

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