I have a Macbook Pro Late 2011 Model 15", updated to latest version Mountain Lion 10.8.5
2Ghz Core i7
4GB DDR3 memory
128GB SSD + 500GB HD
Focusrite Pro40 (Firewire)
I was running Cubase amazingly well on this setup, until one day my battery died and everything went haywire. I am running the system connected at all times, and have no need for the battery.
The system started freezing and giving me extreme high CPU usage from kernel and made Cubase unusable. I was able to fix this by modifying a kext extension (Fix here: http://www.rdoxenham.com/?p=259). I thought the problems would end there. kernel_task CPU usage went down to 20%
Going back to Cubase - all the projects that were running 100% completely fine started acting insanely sluggish and giving me extreme unusable digital noise until I got rid of half the tracks \ vsts.
I was wondering what happened? This system was perfectly capable of running these exact same files, suddenly it is unable to handle them!
I have tried:
1- Deleting \ resetting the cache
2- Repairing permissions for hard drives (+SMART scan on both HDs)
3- Resetting NV ram etc
4- There are no overheating issues (running at 65± celsius)
Somebody please help with this issue.
JUST AN UPDATE:
kernel_task is still causing the problem. While Cubase is running at 200% , I noticed that right behind it, kernel_task is running at 25%. Its the outlier and whats causing the issue. Somebody please help me get rid of the pesky Kernel_task bug