Attempting:
sudo xrandr --newmode 1152x864_60.00 81.75 1152 1216 1336 1520 864 867 871 897 -hsync +vsync
Gives me:
X Error of failed request: BadName (named color or font does not exist)
Major opcode of failed request: 140 (RANDR)
Minor opcode of failed request: 16 (RRCreateMode)
Serial number of failed request: 43
Current serial number in output stream: 43
