I am seeing this again on the latest stable release on Ubuntu 20.04 on a Dell Precision with attached displays.
Linux bdp 5.4.0-42-generic #46-Ubuntu SMP Fri Jul 10 00:24:02 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux TU117GLM [Quadro T1000 Mobile] nvidia-driver-440 440.100-0ubuntu0.20.04.1 xrandr output: eDP-1-1 connected (normal left inverted right x axis y axis) PRIME Synchronization: 0 DP-1-1 disconnected (normal left inverted right x axis y axis) PRIME Synchronization: 1 DP-1-2 connected primary 2560x1440+0+0 (0x29e) normal (normal left inverted right x axis y axis) 597mm x 336mm PRIME Synchronization: 0 DP-1-3 disconnected (normal left inverted right x axis y axis) PRIME Synchronization: 1 DP-1-1-1 disconnected (normal left inverted right x axis y axis) PRIME Synchronization: 1 DP-1-1-2 disconnected (normal left inverted right x axis y axis) PRIME Synchronization: 1 DP-1-1-3 connected 1080x1920+2560+0 (0x29f) left (normal left inverted right x axis y axis) 527mm x 297mm PRIME Synchronization: 0 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1857271 Title: Focal 440.44-0ubuntu1 PRIME Sync not working To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-390/+bug/1857271/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs