- Joined
- Oct 23, 2013
- Messages
- 7
- Motherboard
- HP Envy 17-u177cl Laptop (Clover)
- CPU
- i7-7500U
- Graphics
- Intel HD620/NVIDIA 940MX, 1920x1080
I have a RX 560 (that shows up as a Radeon Pro 555 in System Report) and it worked fine under High Sierra. I just upgraded to Catalina and this exact problem is showing up. I have a 4K HDMI KVM switch and when I switch to another computer and then switch back the video signal is gone and I cannot wake it up. Only way I was able to get the screen back was to unplug the HDMI from the graphics card and plug in back in. I was able to find a work around that is a little annoying: I set my power settings to turn off the display after 1 minute. It turns out that if the power save turns it off, it WILL turn back on when I switch back to it from the KVM. As long as I do not switch back and forth faster than a minute this works. But I would love to have a fix. It seems that it must be detecting the monitor being "turned off" and turn off the video signal. And then it is unable to notice that the monitor is back when the KVM is switched to it. Seems like there powerd is a likely culprit.