Activate DSI1 and HDMI in Raspberrry PI CM4 module

【。。。Displays together without any issue】-》mean display well

【。。。 i cant foud the output】-》So， You can find output

So what  is your problem

OK i will Make it clear for you I want to connect DSI HMI display and HDMI display to CM4, can you help me in that

bellow attachment is my config file

# 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 the following to adjust overscan. Use positive numbers if console

# goes off screen, and negative if there is too much border

#overscan_left=16

#overscan_right=16

#overscan_top=16

#overscan_bottom=16

# uncomment to force a console size. By default it will be display's size minus

# overscan.

#framebuffer_width=1280

#framebuffer_height=720

# 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)

#hdmi_group=1

#hdmi_mode=1

# 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

# Automatically load overlays for detected cameras

#camera_auto_detect=1

# Automatically load overlays for detected DSI displays

display_auto_detect=1

#dtoverlay=dpi24

#enable_dpi_lcd=1

#display_default_lcd=0

display_default_lcd=1

#dpi_group=2

#dpi_mode=87

#dpi_output_format=0x6f005

#dpi_timings=800 0 40 48 88 480 0 13 3 32 0 0 0 60 0 32000000 6

# Enable DRM VC4 V3D driver

dtoverlay=vc4-fkms-v3d

max_framebuffers=2

#dtoverlay=vc4-kms-v3d

#dtoverlay=vc4-kms-dsi-7inch

# Disable compensation for displays with overscan

disable_overscan=1

[cm4]

# Enable host mode on the 2711 built-in XHCI USB controller.

# This line should be removed if the legacy DWC2 controller is required

# (e.g. for USB device mode) or if USB support is not required.

otg_mode=1

# Run as fast as firmware / board allows

arm_boost=1

[all]

disable_camera_led=1

gpu_mem=256

dtoverlay=pi3-disable-bt

#disable_splash=1

boot_delay=0

dtparam=i2c1=on

core_freq_min=500

max_usb_current=1

#initramfs initrd.img-XXXXX

start_x=1

# Screen 1 @ HDMI0

hdmi_pixel_encoding:0=2

hdmi_force_mode:0=1

disable_overscan:0=1

hdmi_group:0=2

hdmi_mode:0=87

hdmi_force_hotplug:0=1

config_hdmi_boost:0=4

framebuffer_depth:0=32

framebuffer_ignore_alpha:0=1

#=====Optinonal try disabling if display not working

hvs_priority=0x32ff

hdmi_pixel_freq_limit:0=400000000

#====

#2k RGB 5.5 inch LCD

hdmi_drive:0=2

hdmi_cvt:0=1440 2560 49 3 0 0 0

##hdmi_timings=1440 0 50 10 35 2560 0 4 2 2 0 0 0 50 0 198000000 0

You mean you want HDMI and DSI display together ON CM4 ?

With your Current configuration， HDMI LCD or DSI LCD which can display well ？

This have a way to make HDMI and a DPI LCD display together

I  Refer to this link

https://forums.raspberrypi.com/viewtopic.php?t=246384

】open config.txt   Block kms or fkms

#dtoverlay=vc4-fkms-v3d

add the following code

dtparam=audio=off
disable_overscan=1
enable_uart=off 
gpio=0-9=a2
gpio=12-17=a2
gpio=20-25=a2
dtoverlay=dpi24
enable_dpi_lcd=1
display_default_lcd=1
extra_transpose_buffer=2
dpi_group=2
dpi_mode=87
dpi_output_format=0x7F016
hdmi_timings=480 0 26 16 10 640 0 25 10 15 0 0 0 60 0 32000000 1
dtoverlay=waveshare-28dpi-3b-4b
dtoverlay=waveshare-28dpi-3b
dtoverlay=waveshare-28dpi-4b
dtoverlay=dwc2,dr_mode=host
start_x=1
gpu_mem=128
framebuffer_priority=0

sudo nano /usr/share/X11/xorg.conf.d/99-fbturbo.conf

Block the following code

#Section "Device" 
# Identifier "Allwinner A10/A13 FBDEV" 
# Driver "fbturbo" 
# Option "fbdev" "/dev/fb1" 
# Option "SwapbuffersWait" "true" 
#EndSection

add the following code

Section "Device"
        Identifier      "fbturbo0"
        Driver          "fbturbo"
        Option          "fbdev" "/dev/fb0"
 
        Option          "SwapbuffersWait" "true"
        Option          "debug" "true"
EndSection
 
Section "Device"
        Identifier      "fbturbo1"
        Driver          "fbturbo"
        Option          "fbdev" "/dev/fb1"
 
        Option          "SwapbuffersWait" "true"
        Option          "debug" "true"
EndSection
 
Section "Device"
        Identifier      "fbdev0"
        Driver          "fbdev"
        Option          "fbdev" "/dev/fb0"
EndSection
 
Section "Device"
        Identifier      "fbdev1"
        Driver          "fbdev"
        Option          "fbdev" "/dev/fb1"
EndSection
 
Section "Monitor"
    Identifier "Monitor0"
    Option "Primary" "False"
EndSection
 
Section "Monitor"
    Identifier "Monitor1"
    Option "RightOf" "Monitor0"
    Option "Primary" "False"
EndSection
 
Section "Screen"
    Identifier "ScreenTurbo0"
    Monitor "Monitor0"
    Device "fbturbo0"
    Subsection "Display"
    EndSubSection
EndSection
 
Section "Screen"
    Identifier "ScreenTurbo1"
    Monitor "Monitor1"
    Device "fbturbo1"
    Subsection "Display"
    EndSubSection
EndSection
 
Section "Screen"
    Identifier "ScreenDev0"
    Monitor "Monitor0"
    Device "fbdev0"
    Subsection "Display"
    EndSubSection
EndSection
 
Section "Screen"
    Identifier "ScreenDev1"
    Monitor "Monitor1"
    Device "fbdev1"
    Subsection "Display"
    EndSubSection
EndSection
 
Section "ServerLayout"
    Identifier "Multihead"
    Screen  0 "ScreenTurbo0"
    Screen  1 "ScreenTurbo1" rightof "ScreenTurbo0"
    Option  "Xinerama" "true"
EndSection
 
Section "ServerLayout"
    Identifier "Singlehead0"
    Screen  0 "ScreenTurbo0"
EndSection
 
Section "ServerLayout"
    Identifier "Singlehead1"
    Screen  0 "ScreenTurbo1"
EndSection
 
Section "ServerFlags"
    Option "BlankTime"  "0"
    Option "StandbyTime"  "0"
    Option "SuspendTime"  "0"
    Option "OffTime"  "0"
    Option "DefaultServerLayout" "Singlehead0"
EndSection

sudo raspi-config

set  to CLI boot

sudo usermod -a -G tty pi
sudo apt-get install xserver-xorg-legacy
sudo chmod 0744 /dev/fb0

sudo nano /etc/X11/Xwrapper.config

change

allowed_users=console

to

allowed_users=anybody

】Start the double display

sudo nano /etc/rc.local

ADD

su -c "startx -- -layout Multihead &" pi

】 sudo reboot