Manjaro 21.07 cinnamon fresh install boot into blank screen

Hello I have recently installed Manjaro in my Acer R11 Chromebook, I was already using Manjaro but with XFC and I had a clean install in my computer but always it boot in blank screen and I can start X manually using CTRL + ALT + F2 to login into terminal and type start x but with only start x it start blank I have to type startx 600X800 to start correctly for 1366X 768.

How to solve that.