It sounds like this problem may be limited to Wayland sessions (which
includes the login screen). Please try this workaround next time you
install 18.04:
Ctrl+Alt+F4, log in, edit /etc/gdm3/custom.conf and uncomment the line:
#WaylandEnable=false
Then reboot.
** Tags added: multi-monit radeon
** Tags removed: multi-monit
** Tags added: multi-monitor
** Summary changed:
- dual monitor not working in 18.04(.1)
+ Dual monitor not working in 18.04(.1) on a dual-radeon-GPU system
** Package changed: xorg (Ubuntu) => mutter (Ubuntu)
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1792822
Title:
Dual monitor not working in 18.04(.1) on a dual-radeon-GPU system
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1792822/+subscriptions
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