1 在/etc/X11/xorg.conf.d目录下创建一个xorg.conf文件，该文件决定系统启动后默认的分辨率

2 填写如下内容

 Section "Monitor"
        Identifier   "Monitor0"
        VendorName   "Monitor Vendor"
        ModelName    "Monitor Model"
        # 1920x1080 @ 60.00 Hz (GTF) hsync: 67.08 kHz; pclk: 172.80 MHz
        Modeline "1920x1080_60.00"  172.80  1920 2040 2248 2576  1080 1081 1084 1118  -HSync +Vsync
EndSection
 
Section "Screen"
        Identifier "Screen0"
        Device     "Card0"
        Monitor    "Monitor0"
        SubSection "Display"
                Viewport   0 0
                Depth     24
                Modes   "1920x1080_60.00"
        EndSubSection
EndSection

3 启动后默认分辨率就是1920x1080了