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I'm using a 2-port KVM switch between my Mac Mini and a Ubuntu desktop computer. I have no problems with the Ubuntu machine waking up when I switch to the inputs. However, when I switch over to the Mac Mini, the monitor stays dark.

This problem only started after upgrading the Mac Mini to OSX 10.11 El Capitan.

FWIW: When I VNC in from another computer, the monitor fires up just fine and I can do stuff just fine. Then I can use the keyboard and mouse hooked up through the KVM switch on the Mac Mini.

Also, I am switching using the physical buttons on the KVM switch; not a hotkey sequence on the keyboard.

Any ideas?

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  • Add me to the list, same problem. I can switch to multiple Win10 computers and they wake just fine, but the monitor stays dark on the Mac Mini. Running OSX 10.11.2. The Mac Mini needs to be sitting idle for quite a while for this to happen. Not sure if it's tied to the screen saver yet or not.
    – user164569
    Commented Jan 6, 2016 at 22:16
  • A workaround that is only slightly annoying. Disconnect the display cable only from the macbook whenever done using that machine, leaving the USB and power plugged in. When you want to KVM back to that machine hours later, simply plug in the display cable and then wiggle the mouse. That seems to reliably wake it for me... but who knows if it will work for others too.
    – The111
    Commented Jan 10, 2016 at 21:09

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While I do not have an answer to your problem, I can add a "me too" with having issues with KVM's and El Capitan. I have an ATEN CS1944 kvm that works just fine with everything up to and including Yosemite. When I convert machines to El Capitan the the KVM and the machines freak out when the kvm shifts focus away from the El Capitan machine and then ultimately requires a reboot of the affected machine to get things going again.

Tried numerous work arounds and tweaks with no success. Between this kvm issue and the other issues that arose with the converted machines not playing well as XSAN clients (kept randomly failing to auto-mount the xsan volumes) upon machine startup, I had to bite the bullet and fall back to Yosemite on the 2 converted machines that were attached to the KVM.

I guess it will be a wait for KVM firmware updates and or OS X patches / fixes to try again after the product matures a little more. Keeping the fingers crossed and continuing research for a fix.

Good luck with resolution to your issue as well.

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