Is there any way to recognize a samsung synchmaster 213T monitor?

edit

The machine has an nvidia geforce 6150 se 430 card, but is running the VESA nouveau driver for nvidia.

I attempted to load the nvidia drivers on fedora 22, and it failed. Likely I will try again, since it was working in fedora 20 or thereabouts. The current OS is fedora 23, newly installed.

The VESA driver maxes out at 1024x768. The 213T monitor is 21".

Fooling with xrandr , I tried this ( this example is copied, my results, on the other machine, use the values given xrandr to set the new mode ) and got identical errors:

$ gtf 1920 1080 60

    # 1920x1080 @ 60.00 Hz (GTF) hsync: 67.08 kHz; pclk: 172.80 MHz
    Modeline "1920x1080_60.00" 172.80 1920 2040 2248 2576 1080 1081 1084 1118 -HSync +Vsync

$ xrandr --newmode "1920x1080_60.00" 172.80 1920 2040 2248 2576 1080 1081 1084 1118 -HSync +Vsync

    xrandr: Failed to get size of gamma for output default

$ xrandr --addmode default "1920x1080_60.00"

    xrandr: Failed to get size of gamma for output default

Thanks for any and all suggestions