I've been running a dual screen setup happily for some time, but have recently acquired a Sony Bravia TV, which I thought might make a useful third screen.
I'm running Ubuntu 20.04 (newly upgraded from 18.04). My desktop has onboard Intel HD530 graphics, with 3 output sockets - 1 HDMI, 1 DVI and 1 VGA. 1 screen accepts HDMI/VGA, the second DVI/VGA and the TV HDMI/VGA. With the 2 monitors connected via HDMI and DVI respectively, the system recognizes bothscreens and everything works nicely.
When I connect the TV via VGA, the TV shows an "out of range" error and the HDMI goes to a black screen. Neither the TV nor the HDMI monitor appear in the Screen Display Settings, and my display collapses to a single screen system on the DVI monitor. A similar thing happens if I connect the monitor via VGA and the TV via HDMi. If I remove the VGA cable, the system works perfectly with an HDMI connection to either the HDMI screen or the TV.
From my browsing on the net, I'm not sure if it's actually possible to use all 3 onboard graphics connections simultaneously, so I realise that I might be trying to do the impossible. That said, any advice of suggestions would be appreciated.
TIA,
mediax
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