Same issue on Ubuntu Mate 20.04 with Radeon RX 5600 XT with stock driver and also with driver version 20.30 (from AMD).
Affected :
- single DP>VGA monitor
- single HDMI>HDMI TV
- dual screens DP>VGA monitor with HDMI>HDMI TV
Another workaround : no issue if set to marco with GPU compositor compton:
`marco-compton`
If upgraded from 18.04 to 20.04 compton is still installed.
Same issue on Ubuntu Mate 20.04 with Radeon RX 5600 XT with stock driver and also with driver version 20.30 (from AMD).
Affected :
- single DP>VGA monitor
- single HDMI>HDMI TV
- dual screens DP>VGA monitor with HDMI>HDMI TV
Another workaround : no issue if set to marco with GPU compositor compton:
`marco-compton`
If upgraded from 18.04 to 20.04 compton is still installed.