Text only installation - how to get system to recognize HDMI monitor plugged in after boot

R

rabinnh

To elaborate on the subject above, if I boot with a monitor installed, I get the console. However if I plug the monitor in after the system is booted, it doesn't appear to be recognized.

Is there a command I can execute (via ssh) to make the system recognize the monitor?

Thanks.
 
In my experience; no. On some systems HDMI works whenever a cable is plugged in, on other systems it only works if there is a cable (and monitor) attached at boot time. I have not been able to find a way to enable a "disabled" HDMI output after a machine has booted.
 
I've had the effect with a few monitor/graphics card combinations, that in console mode, after I switched off the monitor for hours (leaving the computer on), and then on again, the monitor would not recognize a signal. My unconfirmed suspicion is that the graphics card somehow noticed that no one wanted the signal and turned it off and wouldn't detect that a monitor was powered-on again.
I could convince the graphics card to send a signal again after switching to graphics mode (blindly typing startx to start the X server).
Try finding a way to switch video modes and see if it helps.
 
Hi, I'm having a very similar issue... when the hdmi monitor is plugged at boot time, all is good. However, if the monitor is not plugged at boot time, I'm unable to "hotplug" the monitor (no signal).

Here is the output of my sysctl -a | grep -i hdmi:
pcm2: <Intel Kaby Lake (HDMI/DP 8ch)> at nid 3 on hdaa1
pcm2: <Intel Kaby Lake (HDMI/DP 8ch)> at nid 3 on hdaa1
dev.pcm.2.%desc: Intel Kaby Lake (HDMI/DP 8ch)
Pin cap: 0x09000094 PDC OUT HDMI DP HBR
 
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