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Thread: Raspberry Pi 4b X black screen but work

  1. #1
    Join Date
    2019-Jul
    Posts
    2

    Raspberry Pi 4b X black screen but work

    Hi all,

    My Rpi 4b with kali 2019.2a has a 7" HDMi screen that need some tweaking in config.txt:
    Code:
    max_usb_current=1
    config_hdmi_boost=7
    hdmi_drive=1
    hdmi_force_hotplug=1
    hdmi_group=2
    hdmi_mode=1
    hdmi_mode=87
    hdmi_cvt=1024 600 60 6 0 0 0
    The screen work perfectly on VT but is black with X. I've disabled display-manager with systemctl. Installed awesome wm and launched it with xinit. Black scrreen but X work and awesome is launched. I just can't see it.
    xrandr --display :0 return:
    Code:
     Screen 0: minimum 320 x 200, current 1024 x 600, maximum 7680 x 7680
    HDMI-1 connected primary 1024x600+0+0 (normal left inverted right x axis y axis) 255mm x 255mm
        1024x600     60.04*+
        1920x1080   60.00
        1600x900     60.00
        ...
    This screen work perfectly with raspbian on rpi4, raspbian and alpine on rpi3b+.

    Nothing really interesting in Xorg.0.log (i may be wrong but there's no error).

    I can't try on another screen for now. I may try on my TV later.

    Thank you in advance.

  2. #2
    Join Date
    2015-Nov
    Location
    Australia
    Posts
    266
    Hi bda`,

    which screen are you using? The original raspberry pi 7" screen works without any manual tweaks but others may require us to update the kalipi-tft-config.
    I can look into it if you could send me a link to the model.

  3. #3
    Join Date
    2019-Jul
    Posts
    2
    Hi,
    It's this one: http://imakeasy.com/product/2.html
    There's some doc on the CD:
    How to use with Raspbian System
    Step 1, Install Raspbian official image
    1.download the latest image from the official download.
    2.install the system according to the official tutorial steps.
    Step 2, modify the “config.txt”
    After the programming of Step1 is completed, open the config.txt file of TF card root directory
    and add the following code at the end of the file, save and eject TF card safely:
    max_usb_current=1
    hdmi_force_hotplug=1 config_hdmi_boost=7
    hdmi_group=2
    hdmi_mode=1
    hdmi_mode=87
    hdmi_drive=1
    display_rotate=0
    hdmi_cvt 1024 600 60 6 0 0 0
    Step 3, Run
    Insert the SD card to Raspberry Pi, connect the Raspberry Pi and LCD by HDMI cable; connect USB
    cable to one of the four USB ports of raspberry PI, and connect the other end of the USB cable to
    the USB port of the LCD; then supply power to Raspberry Pi; after that if the display and touch
    both are OK, it means drive successfully ( pls use the full 2.5A for power supply).
    Thanks

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