Troubleshooting • [/dev/fb0] Trying to build full screen app in multi-user mode

Code:

Linux DietPi 6.1.21-v8+ #1642 SMP PREEMPT Mon Apr  3 17:24:16 BST 2023 aarch64 GNU/Linux

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mode "1920x1080"mode "1920x1080"    geometry 1920 1080 1920 1080 16    timings 0 0 0 0 0 0 0    accel true    rgba 5/11,6/5,5/0,0/0endmodeFrame buffer device information:    Name        : vc4drmfb    Address     : 0    Size        : 4147200    Type        : PACKED PIXELS    Visual      : TRUECOLOR    XPanStep    : 1    YPanStep    : 1    YWrapStep   : 0    LineLength  : 3840    Accelerator : Noendmode

Code:

 $ fbset -depth 32ioctl FBIOPUT_VSCREENINFO: Invalid argument

Code:

/etc/fb.modes

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 $ grep geometry /etc/fb.modes     geometry 640 480 640 480 8    geometry 640 480 640 480 8    geometry 640 480 640 480 8    geometry 640 480 640 480 8    geometry 640 480 640 480 8    geometry 768 576 768 576 32    geometry 800 600 800 600 8    geometry 800 600 800 600 8    geometry 800 600 800 600 8    geometry 800 600 800 600 8    geometry 800 600 800 600 8    geometry 800 600 800 600 8    geometry 800 600 800 600 8    geometry 800 600 800 600 8    geometry 1024 768 1024 768 8    geometry 1024 768 1024 768 8    geometry 1024 768 1024 768 8    geometry 1024 768 1024 768 8    geometry 1024 768 1024 768 8    geometry 1024 768 1024 768 8    geometry 1024 768 1024 768 8    geometry 1152 864 1152 864 8    geometry 1152 864 1152 864 8    geometry 1152 864 1152 864 8    geometry 1152 864 1152 864 8    geometry 1152 864 1152 864 8    geometry 1152 864 1152 864 8    geometry 1280 960 1280 960 8    geometry 1280 960 1280 960 16    geometry 1280 960 1280 960 32    geometry 1024 1024 1024 1024 8    geometry 1280 1024 1280 1024 8    geometry 1280 1024 1280 1024 8    geometry 1280 1024 1280 1024 8    geometry 1280 1024 1280 1024 8    geometry 1280 1024 1280 3264 8    geometry 1600 1200 1600 1200 8    geometry 1600 1200 1600 1200 8    geometry 1600 1200 1600 1200 8    

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1280 960 1280 960 32

Code:

 $ sudo fbset -fb /dev/fb0 -xres 1280 -yres 960 -depth 32 ioctl FBIOPUT_VSCREENINFO: Invalid argument 

Code:

# Docs: https://www.raspberrypi.com/documentation/computers/config_txt.html# Overlays: https://github.com/raspberrypi/firmware/blob/master/boot/overlays/README#-------Display---------# Max allocated framebuffers: Set to "0" in headless mode to reduce memory usage# - Defaults to "2" on RPi4 and "1" on earlier RPi models#max_framebuffers=0# If you get no picture, set the following to "1" to apply most compatible HDMI settings.#hdmi_safe=1# Uncomment to adjust the HDMI signal strength if you have interferences, blanking, or no display.# - Ranges from "0" to "11", use values above "7" only if required, e.g. with very long HDMI cable.# - Default on first RPi1 A/B is "2", else "5", on RPi4 this setting is ignored.#config_hdmi_boost=5# Uncomment if HDMI display is not detected and composite is being outputted.#hdmi_force_hotplug=1# Uncomment to disable HDMI even if plugged, e.g. to force composite output.#hdmi_ignore_hotplug=1# Uncomment to force a console size. By default it will be display's size minus overscan.#framebuffer_width=1280#framebuffer_height=720# Uncomment to enable SDTV/composite output on RPi4. This has no effect on previous RPi models.#enable_tvout=0# SDTV mode#sdtv_mode=0# Uncomment to force a specific HDMI mode (this will force VGA).#hdmi_group=1#hdmi_mode=1# Uncomment to force an HDMI mode rather than DVI. This enables HDMI audio in DMT modes.#hdmi_drive=2# Set "hdmi_blanking=1" to allow the display going into standby after 10 minutes without input.# With default value "0", the display shows a blank screen instead, but will not go into standby.# NB: Some legacy OpenMAX applications (OMXPlayer) cannot wake screens from real standby.hdmi_blanking=1# Set to "1" if your display has a black border of unused pixels visible.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=16#overscan_right=16#overscan_top=16#overscan_bottom=16# Rotation#display_hdmi_rotate=0#lcd_rotate=0#-------RPi camera module-------#start_x=1#disable_camera_led=1#-------GPU memory splits-------gpu_mem_256=76gpu_mem_512=76gpu_mem_1024=76#-------Boot splash screen------disable_splash=1#-------Onboard sound-----------dtparam=audio=on#-------I2C-------------#dtparam=i2c_arm=on#dtparam=i2c_arm_baudrate=100000#-------SPI-------------dtparam=spi=off#-------Serial/UART-----# NB: "enable_uart=1" will enforce "core_freq=250" on RPi models with onboard WiFi.enable_uart=0#-------SD card HPD-----# Comment to enable SD card hot-plug detection, while booting via USB or network.# NB: This causes constant CPU load and kernel errors when no SD card is inserted.dtparam=sd_poll_once#-------Overclock-------temp_limit=75initial_turbo=20#over_voltage=0#arm_freq=1500#core_freq=500#over_voltage_min=0#arm_freq_min=300#core_freq_min=250#sdram_freq_min=400arm_64bit=1dtoverlay=vc4-kms-v3d-pi4dtoverlay=disable-wifidtoverlay=seeed-can-fd-hat-v2