Comet RM10 loses HDMI after reboot with Macbook (lid closed)

KVM
1

Hi

I have observed that if the KVM reboots (crash/upgrade) or if my Macbook reboots, the HDMI signal is lost. I have the lid closed when the KVM is connected. I have to unplug and replug the HDMI cable and sometimes open the lid for the HDMI handshake to happen again. Is there some way to force an HDMI handshake?

Thanks

2

Instead of reconnecting the cable have you tried to re-login or restart the kvm? Another option is to trigger the wake on lan

3

i have tried the restart but that didnt seem to trigger it but i will try it again. the macbook is on; it just loses the hdmi sync

4

you probably have done this, but on the battery management settings of the mac set:

  • “low power mode” to only battery or never
  • enable prevent automatic sleeping on power adapter when the display is off
  • wake for network access → only on power adapter or always

and keep the mac always connected to the power adapter

1 Like
5

It’s likely a ‘trust accessory’ problem. I had the same problem (but only from time to time) until I went in and ‘always trust’ existing accessories. I realize that there are real world attack vectors tied to this setting - so I would never to this with a mobile PC that I travel with.