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I have installed ubuntu 20.10 on a raspberry pi 4 to have a media server, I used the code posted here Add Fake Display when No Monitor is Plugged In to make it work without a monitor and I manage it via team viewer.

for several months I worked perfectly, but now something happened to the team viewer app and is not working properly(I can only keep the connection for a few seconds and then it colses), now that I try to use a real monitor to see if I can fix the issue with the team viewer app, the monitor doesn't show any image. I know that the OS loaded correctly because I can see it working if I try to connect with the team viewer app.

what can I do to get a monitor working having in mind that the remote control is not working properly? I don't want to reintall everything again from scratch.

sixthchild09
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1 Answers1

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I'm currently using Ubuntu 22.04 LTS and I think I have the same problem as yours. I've made some (small) changes to /boot/firmware/config.txt and it works for me. This is my config file: 

[all]
kernel=vmlinuz
cmdline=cmdline.txt
initramfs initrd.img followkernel

[pi4]
max_framebuffers=2
arm_boost=1


[all]


Enable the audio output, I2C and SPI interfaces on the GPIO header. As


these


parameters related to the base device-tree they must appear before any


other dtoverlay= specification


dtparam=audio=on
dtparam=i2c_arm=on
dtparam=spi=on


Comment out the following line if the edges of the desktop appear outside


the edges of your display


disable_overscan=1


If you have issues with audio, you may try uncommenting the following


line


which forces the HDMI output into HDMI mode instead of DVI (which doesn't


support audio output)


#hdmi_drive=2


[cm4]


Enable the USB2 outputs on the IO board (assuming your CM4 is plugged


into


such a board)


dtoverlay=dwc2,dr_mode=host


[all]


Enable the KMS ("full" KMS) graphics overlay, leaving GPU memory as the


default (the kernel is in control of graphics memory with full KMS)


#dtoverlay=vc4-kms-v3d
dtoverlay=vc4-fkms-v3d
max_framebuffers


Autoload overlays for any recognized cameras or displays that are


attached


to the CSI/DSI ports. Please note this is for libcamera support, not


for


the legacy camera stack


camera_auto_detect=1
display_auto_detect=1


Config settings specific to arm64


arm_64bit=1
dtoverlay=dwc2


#overclocking
over_voltage=5
arm_freq=2000


uncomment if hdmi display is not detected


hdmi_force_hotplug=1


uncomment to force a specific HDMI mode


hdmi_group=2
hdmi_mode=82


hdmi_enable_4k60=1
gpu_mem=256
gpu_freq=500
start_x=1

So, basically, I've copied the whole config file from my Raspberry Pi OS on the other hard drive (with some minor adaptations for Ubuntu 22.04 LTS ofcourse).

Oh, and I'm using RealVNC Server instead of Teamviewer.

AeroJohnBE
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