I use Yosemite 10.10.4 on my MacBook Pro (2012).
I used to work with an external monitor: Apple Thunderbolt 27" monitor.
The issue is that, according to Activity Monitor, the
kernel_task process consumes more than 600%of CPU even when no tasks are running! The computer becomes totally unusable.
The workaround is to disconnect the external monitor, but I really need this secondary screen to work.
Why didn't Apple fix this issue in the latest Yosemite update?
Is there a fix for this?