This worked for me:
Code:
gtf 1920 1080 60
xrandr --newmode "1920x1080_60.00" 172.80 1920 2040 2248 2576 1080 1081 1084 1118 -HSync +Vsync
xrandr --addmode DVI-I-1-1 "1920x1080_60.00"
xrandr --output DVI-I-1-1 --mode "1920x1080_60.00"
Use the output from gtf (after Modeline) in xrandr --newmode
Replace DVI-I-1-1 with your xrandr DisplayLink output.