Hot plugging of HDMI seems to work well on Raspberry Pi OS (see here). I tried to achieve the same with Ubuntu Server 20.04 on my RPi3B+ by adding the same lines to /boot/firmware/usercfg.txt:
hdmi_force_hotplug=1
hdmi_group=1
hdmi_mode=16
... but it doesn't seem to work. Is there a way to achieve hot HDMI switching on Ubuntu Server 20.04 for RPi series?
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