I am sorry to hear you are having problems with the resolution in your computer but let me help you with this.
At this point I am not sure what driver version you currently have installed in your system but I recommend you the following:
- Uninstall the current driver from Device Manager
- Restart the computer.
- Download the latest driver for your graphics controller at the following link:
Re-install the latest driver, my problem was similar.. trying to use mi notebook as proyector, the max resolution was 1366x768, but when i Uninstall and re-install the new driver, my final resolution is 1680x1050 (viewsonic optiquest in my case)
Latest version now: 18.104.22.16829