I installed Linux Mint 18 on an Intel NUC6i3 and TV 11

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Hi, everyone, i have question: I installed Linux Mint 18 on an Intel NUC6i3 and TV 11. The NUC does not have a monitor connected. When I connect via TV I only get one resolution - 1024x768. I installed Intel vga drivers.

inxi -G shows the following output:

Graphics: Card: Intel Sky Lake Integrated Graphics

Display Server: X.Org 1.18.4 drivers: intel (unloaded: fbdev,vesa)

Resolution: 1024x768

GLX Renderer: Mesa DRI Intel HD Graphics 520 (Skylake GT2)

GLX Version: 3.0 Mesa 11.2.0

Any suggestions how I can change the resolution?

Thanks you so much !!!