Computer slows down when connected to external monitors
I am working on a MacBook Pro that has dual GPUS (Intel Iris & AMD Radeon)
The user uses 2 external monitors.
His computer starts slowing down, the kernel usage gets to 87% and oddly bounces as high as 240 %. The laptop is a bit warmer than usual but no thermal problems. The user reports that when this problem started that it was about 1 hour or so before the computer slows down; it is now starting to slow down in about 5 minutes.
The user has reset the PRAM and also SMC reset but no change.
Is this a hardware failure? Thanks
Ist dies eine gute Frage?
Having experienced this issue myself using a MBP with 2 x LG LED 24EN43 monitors; I read these comments with interest. Although not mentioned, I just unplugged the monitors and went to System Preferences/Displays/Colour then hit the Calibrate button. That was a perfect fix. Everything works like brand new! Hope this helps you too.
Another useful tip from...
von Chris Williams-Lilley
Sorry mate, I don't see how color calibration (which is just a software profile) would affect the CPU performance, especially when I (I don't know about the others) am experiencing this issue even on boot camp in Windows! Regardless, I tried your suggestion, and it made absolutely no difference; after 30 seconds the laptop was throttling again.
von Alexandros Vernardis
He means that he 'disconnected' permanently monitors and calibrated his laptop instead :) Never connected them back ;)
In my particular case, I actually found out after lots of frustration that my laptop power cord has an issue and while it was connected, I had to bend the cord this way or that in order to have it actually charging. When I took the power cord out of the equation, everything returned to normal. I'm running 3 external monitors...one through an external USB-based video card that I'm using 1 DVI port, one through the existing laptop HDMI port and one through the existing laptop VGA port. Up until my issues this afternoon, all 4 screens worked flawlessly...then all of the sudden it was like my computer was bogged down with too many tasks...just moving the mouse across the screen was a multi-minute chore...so, if anybody else is troubleshooting, as strange as it sounds...check that your power cord is working properly.
I was able to fix the problem by matching the display resolution for both monitors. When the laptop monitor and the usb monitor were the same resolution there was no slowing.
von Todd Helfman
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