No image if monitor is plugged on Raspberry Pi

[rfemali3]

I was having an issue with very slow response with NoMachine on Raspberry Pi. I found this post https://forums.nomachine.com/topic/how-to-solve-slow-response-connecting-to-headless-no-monitor-raspberry-pi and it helped xevilmax stated after making the adjustments all was working well with or without a monitor. For me it works well headless but I no longer get an image if I plug the monitor in. Any suggestions to get the monitor working again?

Also, he stated:

#Open configs
sudo nano /boot/config.txt
#Disable Hardware acceleration (may be useful only if you are sure to have always monitor attached)

#Enable DRM VC4 V3D driver
#dtoverlay=vc4-kms-v3d
#max_framebuffers=2

But I did not find anything regarding hardware acceleration in my /boot/config.txt. Is this just due to an OS difference?

I am running 5.15.32-v7l+ on 32 bit Raspberry Pi 4

[kroy]

According to the RPi documentation – dtoverlay option requests the firmware to load a named Device Tree overlay – a configuration file that can enable kernel support for built-in and external hardware (https://www.raspberrypi.com/documentation/computers/configuration.html#part3.1).

Try to set the older driver:

dtoverlay=vc4-fkms-v3d
max_framebuffers=2

and let us know if you see the difference.

[Britgirl]

rfemali3, it’s not clear if your topic is about slow response or no image. Which problem are you actually experiencing. I understand that as a headless Linux, NoMachine works well. We have just verified to make sure.

Kroy has been kind and looked in the Rpi documentation for you for some tips. But I think that your question is more appropriate for the RPi forums perhaps because your configuration is not the standard manufacturer’s one.

[rfemali3]

Britgirl,

The original issue was slow response. I employed the fix I listed and the slowness is rectified, but I can only run headless. I get no image if I plug the monitor in.

[Britgirl]

What monitor are you actually attaching? What distro is installed on the Raspberry? And did you try the suggestion provided by Kroy? Ultimately, we can look at the logs of a remote connection, player and server sides to verify what’s happening. Send them to forum[at]nomachine[dot]com.

Instructions are here:

https://kb.nomachine.com/DT11R00182
https://kb.nomachine.com/DT11R00181

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