

I bought an rMBP not long ago and have been looking around for a solution for switching off the built-in screen while watching movies on a TV via HDMI.įor me dimming the brightness via an automated applescript and then turning it back on using the same script solved it. The gpu is by far the hottest running processor in the macbooks and keeping its running temperature low is crucial to component aging, ventilator noise etc.

Hope that such a switch-off option exists or that apple comes up queickly with one. So the question to which i have not found a reply anywhere so far, is how to switch the macbook pro`s built-in screen in order to avoid gpu cycles being wasted on that screen while working with big extrenal screen(s). then run a temperature monitoring software and watch temos rise to very high levels.Įspecially in maverick, due to its many additional background routines. Simply try connecting two external 27" screens and open some flash video on them - and on the built.in screen. I think turning down the screen backlight is not what really matters here, what is truly of interest when driving big external screens is to keep the workload on the gpu low inorder to prevent temperature rise in the laptop.Īs far as i observed, adding external displays increases the gpu workload significantly and with that comes temperature rise in the lapotop and increase in ventilator noise - and increased risk of component faillure due to high temperature in the laptop.
