I've a Raspberry Pi 3 B+ with Ubuntu 18.04 installed.
With an SSH connection with my Kubuntu PC, the transfer is good (4.5Mo/s) when RPi's screen is OFF (via
xset dpms force standby)
but if the RPi's screen is ON (
xset dpms force on), the flux is only 1Mo/s.
Do you know why ? Does the HDMI port shared ?