How to solve slow response connecting to headless (no monitor) Raspberry Pi

[xevilmax]

Hi,

It’s not a question, it’s directly a solution.

I’m setting up new Arm64 RaspiOs (beta) with latest 5.10.y-78 kernel.

https://downloads.raspberrypi.org/raspios_arm64/images/

Testing on RPI4 and RPI3B+

 

While monitor is connected and i boot system, all works fine (at least with 128mb or more of GPU).

But when i boot without monitor attached remote GUI connection is almost unusable.

Tried different workarounds:

• Setting up: xserver-xorg-video-dummy (not good if monitor sometimes is attached sometimes not)
• sudo service lightdm stop
  sudo /usr/NX/bin/nxserver –restart

But here is my top solution:

#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

#Save and exit
sudo reboot now

 

After this all works perfectly with or without monitor attached

Also you may want to set defaut screen size in config.txt like:

# uncomment to force a console size. By default it will be display’s size minus
# overscan.
framebuffer_width=1440
framebuffer_height=900

 

Hope it will be useful to someone in future.

[Britgirl]

Thanks for submitting this to our forums! Other RPi users could find it extremely useful 🙂

[Author]

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