Sorry, the specs in my description is outdated. This is for my lenovo y700 laptop that has hybrid intel/nvidia graphics (GTX 960m/Intel® HD Graphics 530. Using the video-hybrid-intel-nvidia-470xx-prime driver with x11 windowing system. The laptop's display is 1920x1080 60hz and i am running it in extended mode with my 120hz 2560x1080 monitor. I have confirmed that this same exact configuration works in windows on the same machine.
Here are screenshots of my display configuration:
Output of xrandr:
Screen 0: minimum 320 x 200, current 4480 x 1080, maximum 16384 x 16384
eDP-1 connected 1920x1080+2560+0 (normal left inverted right x axis y axis) 344mm x 194mm
1920x1080 60.01*+ 60.01 59.97 59.96 59.93
1680x1050 59.95 59.88
1400x1050 59.98
1600x900 59.99 59.94 59.95 59.82
1280x1024 60.02
1400x900 59.96 59.88
1280x960 60.00
1440x810 60.00 59.97
1368x768 59.88 59.85
1280x800 59.99 59.97 59.81 59.91
1280x720 60.00 59.99 59.86 59.74
1024x768 60.04 60.00
960x720 60.00
928x696 60.05
896x672 60.01
1024x576 59.95 59.96 59.90 59.82
960x600 59.93 60.00
960x540 59.96 59.99 59.63 59.82
800x600 60.00 60.32 56.25
840x525 60.01 59.88
864x486 59.92 59.57
700x525 59.98
800x450 59.95 59.82
640x512 60.02
700x450 59.96 59.88
640x480 60.00 59.94
720x405 59.51 58.99
684x384 59.88 59.85
640x400 59.88 59.98
640x360 59.86 59.83 59.84 59.32
512x384 60.00
512x288 60.00 59.92
480x270 59.63 59.82
400x300 60.32 56.34
432x243 59.92 59.57
320x240 60.05
360x202 59.51 59.13
320x180 59.84 59.32
HDMI-1 connected primary 2560x1080+0+0 (normal left inverted right x axis y axis) 680mm x 288mm
2560x1080 60.00*+
1920x1080 60.00 50.00 59.94
1680x1050 59.88
1280x1080 60.00
1280x1024 75.02 60.02
1440x900 59.90
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.03 60.00
800x600 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 75.00 60.00 59.94
720x400 70.08
Interestingly xrandr doesnt think 120hz is supported even though i know for an absolute fact the hardware supports it, as ive confirmed this configuration working in windows.