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
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 0ubuntu0. 20.04.1
TU117GLM [Quadro T1000 Mobile]
nvidia-driver-440 440.100-
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