I've looked around and cannot find this issue anywhere...
So I have a two-monitor setup on my Ubunutu 14.04 desktop. I had just solved a strange mouse issue by switching to Proprietary NVIDIA drivers for my video card through the software & updates tool, and rebooted my computer. I fixed the issue but a new one came up for me.
I have a two-monitor setup, both are 1920x1080 resolution. They both seem to do what they should, but when I attempt to move my mouse to the screen on the right, my left monitor scrolls right along with it. I don't know quite how to describe it but when I move my mouse all the way to the right, I end up having a mirrored display! Then, when I move the mouse back to the left, the left monitor scrolls back until it's back to two separate monitors.
Whenever I start any program, the window appears in the middle, straddling the two screens. It leads me to believe somehow the left screen's resolution got set too high, but when I look in System Settings under Display, the resolution on both of them is the same, 1920 x 1080. Not really sure why this is. The right screen behaves perfectly as it should.
UPDATE: After fiddling with xrandr settings, I've determined that I want to have two 1920x1080 screens acting like one 3840x1080 desktop, with no panning on either monitor. I am currently stymied by how to accomplish this (I'm very new to xrandr). The commands I've been trying are mostly variations on:
xrandr --output DVI-I-0 --size 1920x1080+1920 --panning 1920x1080 --output HDMI1 --size 1920x1080+1920 --panning 1920x1080
DVI-I-0 is my left (and primary) monitor; HDMI1 is my right one.
I have no idea if this will help, but here's the output of
Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 16384 x 16384 DVI-I-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 521mm x 293mm panning 3840x1080+0+0 1920x1080 60.0*+ 59.9 50.0 60.1 60.0 50.0 1680x1050 60.0 1600x1200 60.0 1440x900 59.9 1280x1024 75.0 60.0 1280x720 60.0 59.9 50.0 1024x768 75.0 60.0 800x600 75.0 60.3 720x576 50.0 50.1 720x480 59.9 60.1 640x480 75.0 59.9 59.9 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) VGA1 disconnected HDMI1 connected 1920x1080+0+0 509mm x 286mm panning 1920x1080+0+0 1920x1080 60.0*+ 1680x1050 59.9 1280x1024 75.0 60.0 1440x900 59.9 1280x960 60.0 1280x800 59.9 1152x864 75.0 1280x720 60.0 1024x768 75.1 70.1 60.0 832x624 74.6 800x600 72.2 75.0 60.3 56.2 640x480 75.0 66.7 60.0 720x400 70.1 HDMI2 disconnected HDMI3 disconnected VIRTUAL1 disconnected 1920x1080 (0x49) 148.5MHz h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 67.5KHz v: height 1080 start 1084 end 1089 total 1125 clock 60.0Hz 1280x1024 (0x2c2) 135.0MHz h: width 1280 start 1296 end 1440 total 1688 skew 0 clock 80.0KHz v: height 1024 start 1025 end 1028 total 1066 clock 75.0Hz 1280x1024 (0x2c3) 108.0MHz h: width 1280 start 1328 end 1440 total 1688 skew 0 clock 64.0KHz v: height 1024 start 1025 end 1028 total 1066 clock 60.0Hz 1024x768 (0x2c8) 65.0MHz h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.4KHz v: height 768 start 771 end 777 total 806 clock 60.0Hz 800x600 (0x2c9) 49.5MHz h: width 800 start 816 end 896 total 1056 skew 0 clock 46.9KHz v: height 600 start 601 end 604 total 625 clock 75.0Hz 800x600 (0x2ca) 40.0MHz h: width 800 start 840 end 968 total 1056 skew 0 clock 37.9KHz v: height 600 start 601 end 605 total 628 clock 60.3Hz 640x480 (0x2cf) 31.5MHz h: width 640 start 656 end 720 total 840 skew 0 clock 37.5KHz v: height 480 start 481 end 484 total 500 clock 75.0Hz