I am trying to setup dual head through DisplayPort (MTS) using an NVidia GTX 760. I have two identical monitors from ViewSonic but both X-server and xrandr are interpreting only one monitor correctly and the other falling back into an unacceptable default.
Output from xrandr -q
root@Saturn:~# xrandr -q
Screen 0: minimum 8 x 8, current 2560 x 1080, maximum 16384 x 16384
DVI-I-0 disconnected (normal left inverted right x axis y axis)
DP-1.1.2 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 598mm x 336mm
1920x1080 60.00*+ 59.94 50.00
1680x1050 59.95
1600x1200 60.00
1600x900 60.00
1440x900 59.89
1400x1050 59.98
1280x1024 75.02 60.02
1280x960 60.00
1280x720 60.00 59.94 50.00
1024x768 75.03 70.07 60.00
800x600 75.00 72.19 60.32 56.25
720x576 50.00
720x480 59.94
640x480 75.00 72.81 59.94 59.93
DP-1.1.1 connected 640x480+1920+0 (normal left inverted right x axis y axis) 0mm x 0mm
640x480 59.94*+
DVI-I-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)
DP-0 disconnected (normal left inverted right x axis y axis)
DVI-D-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
I would be willing to force a particular setup with an explicit xorg.conf but all my attempts at doing so have failed so far. I have reverted to removing xorg.conf.
I have connected the single display port output from GTX 760 to a 4-way Club CSV-6400 hub. On the first two outputs from the hub I have connected DisplayPort to HDMI adaptors and from there, directly to the monitors. As I said before, both monitors are identical.
Debug pack attached.
nvidia-bug-report.log.gz (1.14 MB)