Xrandr refuse set resolution

I have a weird problem with xrandr in openbox, i list all possible resolutions with xrandr i get all possible settings?
And all seem to work except 1360x768 and that is the one i need... a bit strange because there is no problem using graphical interface like arandr.
I would like to do a script that always load the resolution in .config/openbox/autostart the script working but the resolution do not.

jonas@jonas-STCK1A8LFC:~$ xrandr -s 1360x768
Size 1360x768 not found in available modes

jonas@jonas-STCK1A8LFC:~$ xrandr
Screen 0: minimum 8 x 8, current 1280 x 720, maximum 32767 x 32767
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 connected 1280x720+0+0 (normal left inverted right x axis y axis) 1280mm x 720mm
1920x1080 60.00 + 50.00 59.94 30.00 25.00 24.00 29.97 23.98
1920x1080i 60.00 50.00 59.94
1600x1200 60.00
1280x1024 60.02
1360x768 59.80
1280x720 60.00* 50.00 59.94
1024x768 60.00
800x600 60.32
720x576 50.00
720x576i 50.00
720x480 60.00 59.94
720x480i 60.00 59.94
640x480 60.00 59.94
VGA1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

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Xrandr refuse set resolution