jojobrogess
commented
2 years ago I think there is a setting somewhere on RPI that allows you to adjust the vga properties of the screen(if screen shows blank, or something like that). If I can find it, I'll post the location
Hi I have a VGA monitor and when i connect to the deskpi pro with the vga to hdmi connector it doesn't display anything. If I connect the same cable to a Pi3 it works.
I removed the GPIO board just to experiment to see which area is causing the issue. I connected the cable and the monitor showed the login screen. Put back the GPIO board and the monitor indicates no video input, enter sleep mode.
I am using Ubuntu Desktop 64bit 21.10 OS.
Setting on my /boot/firmware/config.txt
[pi4] max_framebuffers=2
[all] kernel=vmlinuz cmdline=cmdline.txt initramfs initrd.img followkernel
Enable the audio output, I2C and SPI interfaces on the GPIO header
dtparam=audio=on dtparam=i2c_arm=on dtparam=spi=on
Enable the KMS ("full" KMS) graphics overlay, and allocate 128Mb to the GPU
memory. The full KMS overlay is required for X11 application support under
wayland
dtoverlay=vc4-kms-v3d
dtoverlay=vc4-fkms-v3d gpu_mem=128
Uncomment the following to enable the Raspberry Pi camera module firmware.
Be warned that there may be incompatibilities with the "full" KMS overlay
start_x=1
Comment out the following line if the edges of the desktop appear outside
the edges of your display
disable_overscan=1
hdmi_group=2 hdmi_force_hotplug=1 config_hdmi_boost=4
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
If you have a CM4, uncomment the following line to enable the USB2 outputs
on the IO board (assuming your CM4 is plugged into such a board)
Config settings specific to arm64
arm_64bit=1 dtoverlay=dwc2,dr_mode=host