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