0.写在最前面

重要的事情说三遍：
先备份你的config.txt ！
先备份你的config.txt ！
先备份你的config.txt ！
     首先我用的系统是官方系统，你的系统有可能和我不一致；已经有人出现用这种方法导致屏幕不亮，ssh无法连接（有一个系统和我有区别，config.txt中的内容和我的有区别）所以备份好你的 config.txt !
      我不知为什么会出现屏幕不亮，和SSH无法连接的问题，不过我的可以，而且我所更改的地方的参数的作用我都查过，没有动和SSH相关的

1. ssh 连接树莓派

2. 打开 /boot/config.txt

$ sudo nano /boot/config

3. 编辑以下内容

以下项中，有注释的取消注释，没有的项要添加
disable_overscan=1
overscan_left=0
overscan_right=0
overscan_top=0
overscan_bottom=0
framebuffer_width=800 （控制台framebuffer宽度，按需设置）
framebuffer_height=480 （控制台framebuffer高度，按需设置）
hdmi_force_hotplug=1 （即便没有检测到HDMI显示器也要使用HDMI模式，使用 VNC 的一定要设置）
max_usb_current=1
hdmi_group=2
hdmi_mode=87
hdmi_cvt 800 480 60 6 0 0 0 （分辨率800x480 60Hz , 自行修改为自己需要的）
hdmi_drive=2

# For more options and information see
# http://rpf.io/configtxt
# Some settings may impact device functionality. See link above for details

# uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1

# uncomment this if your display has a black border of unused pixels visible
# and your display can output without overscan
disable_overscan=1

# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
overscan_left=0
overscan_right=0
overscan_top=0
overscan_bottom=0

# uncomment to force a console size. By default it will be display's size minus
# overscan.
framebuffer_width=800
framebuffer_height=480

# uncomment if hdmi display is not detected and composite is being output
hdmi_force_hotplug=1 

# uncomment to force a specific HDMI mode (this will force VGA)
max_usb_current=1
hdmi_group=2
hdmi_mode=87
hdmi_cvt 800 480 60 6 0 0 0

# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
hdmi_drive=2

# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
#config_hdmi_boost=4

# uncomment for composite PAL
#sdtv_mode=2

#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=800

# Uncomment some or all of these to enable the optional hardware interfaces
#dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=on

# Uncomment this to enable infrared communication.
#dtoverlay=gpio-ir,gpio_pin=17
#dtoverlay=gpio-ir-tx,gpio_pin=18

# Additional overlays and parameters are documented /boot/overlays/README

# Enable audio (loads snd_bcm2835)
dtparam=audio=on

[pi4]
# Enable DRM VC4 V3D driver on top of the dispmanx display stack
dtoverlay=vc4-fkms-v3d
max_framebuffers=2

[all]
#dtoverlay=vc4-fkms-v3d

4. Ctrl + O 回车 保存，然后 Ctrl + X 退出

5. 输入 sudo reboot 重启，重启后可成功显示桌面

$ sudo reboot

6. 7 寸屏显示效果

7. VNC 显示效果