I want to set specific resolutions to 2 monitors. How can I tell xrandr which monitor to change resolution.
First list your monitors and resolutions:
Take note of your monitors names, example (I truncated the output so as to not list all the resolutions)
Here my monitors are "DVI-I-1" and "DVI-I-2"
With that information you can then set a resolution. Use "--output" and "--mode" to set each monitor's resolution.
Post back, with the output of
Note: xrandr does not work with proprietary drivers.