Hi to get 1080p its really easy all it takes is to edit the config file in the \Steam\steamapps\common\Jedi Academy\GameData\base folder

1: Run single player and Multiplayer at least once to set up the config files

2: Open jaconfig.cfg with notepad

3: Look for the line seta r_mode and change it so it reads as seta r_mode"-1"

4: now look for seta r_customwidth and change it so it reads as seta r_customwidth "1920"

5: Next change seta r_customheight so it reads as seta r_customheight "1080"

6: Add this following line to the bottom of the text: seta cg_fov "95"

if your running 1920x1200 then you would have cg_fov "90" for 16:10 aspect ratios

And you might need to hit "Enter or Esc" To skip the odd cut scene that won't play correctly and one you have it set up don't touch the graphics option in game as they will reset.