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Thread: Blank screen when rebooting

  1. #1
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    Exclamation Blank screen when rebooting

    Everything worked just fine on my raspberry pi 4 until i reboot it, or power it off.

    When booting everything seems fine but the screen just goes black after saying this:

    Directory ´fef00700.hdmi` with parent `vc4-hdmi-0` already present.

    Backlight is on and caps and numlock works I've reinstalled ubuntu 10 times now, using the raspberry flasher but no luck. Ubuntu mate works just fine.

  2. #2
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    Re: Blank screen when rebooting

    Is it a Raspberry Pi4? And if so 4GB or 8GB RAM?

    Which Kernel?

    Bug#986863: linux: Serial terminal for RPi 4 and p400 corrupted during bootup
    Last edited by MAFoElffen; July 3rd, 2021 at 10:22 PM.

    Concurrent coexistance of Windows, Linux and UNIX...
    Ubuntu user # 33563, Linux user # 533637
    Sticky: [all variants] Graphics Resolution- Upgrade /Blank Screen after reboot
    UbuntuForums system-info Script

  3. #3
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    Re: Blank screen when rebooting

    I have a Raspberry pi4 Model B with 4gb ram

    Kernel is: 5.11.0-1007-raspi

    Update: Ubuntu Mate works just fine, and i can turn it on with no problems.

    I've tried installing ubuntu 21.04 from different places and using different applications to flash my sd card.
    Last edited by hermansenn; July 4th, 2021 at 04:54 PM.

  4. #4
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    Re: Blank screen when rebooting

    At the Grub2 boot menu, quickly press <down-arrow><up-arrow>, so the menu stays, and pauses the boot process...

    Press <E> to edit... Go down to the kernel boot line and add the kernel boot option "hdmi_safe=1"...
    Press <Cntrl><X> to Boot...

    After it boots, open an editor in elevated permissions... Open /etc/defaults/grub... Go down to the line where you see the kernel boot options, where it says "quiet splash"... Add "hdmi_safe=1". Save the file. Exit the editor.

    In a terminal do
    Code:
    sudo update-grub
    To pick up the change and make it persistent..

    Concurrent coexistance of Windows, Linux and UNIX...
    Ubuntu user # 33563, Linux user # 533637
    Sticky: [all variants] Graphics Resolution- Upgrade /Blank Screen after reboot
    UbuntuForums system-info Script

  5. #5
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    Re: Blank screen when rebooting

    That does unfortunately not work, i had to reinstall ubuntu on the sd card to get to edit Grub and even Did # before the "GRUB_HIDDEN_TIMEOUT=true" to get Grub menu at boot, if it happened again, but it does not appear.

    I did GRUB_CMDLINE_LINUX_DEFAULT="quiet splash""hdmi_safe=1" and updated grub.

  6. #6
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    Re: Blank screen when rebooting

    Do not put in the extra double quotes...IO just did that so it wouldn't get lost ion the other text of the post, so more like:
    Code:
     GRUB_CMDLINE_LINUX_DEFAULT="quiet splash hdmi_safe=1"
    ...With the extra quotation marks, it is not going to recognize/honor it which the other boot options...
    Last edited by MAFoElffen; July 5th, 2021 at 02:44 AM.

    Concurrent coexistance of Windows, Linux and UNIX...
    Ubuntu user # 33563, Linux user # 533637
    Sticky: [all variants] Graphics Resolution- Upgrade /Blank Screen after reboot
    UbuntuForums system-info Script

  7. #7
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    Re: Blank screen when rebooting

    Still doesn't work :/

    I forgot to mention that i'm not using hdmi cable, but the internal display port on the Raspi. Does that have anything to do with it?

    And do you know a way to get out of the black screen when boot fails, so i don't have to reinstall ubuntu every time i restart my Pi?

    The grub menu doesn't show up either.
    Last edited by hermansenn; July 5th, 2021 at 04:21 AM.

  8. #8
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    Re: Blank screen when rebooting

    If on the keyboard, you hold down the <Cntrl><Alt> keys and try <F1> thru <F7>, it will respectively cycle thru virutal consoles TTY1 thru TTY7. System Console is usually TTY1, until the Login Manager starts in it, then transfers to the first open TTY (usually TTY2) so that one is probably the one that is blank.

    It's virtual TTY consoles, so virtual terminal sessions overlaid on top of the text console. It's at least a change to make changes and see what is going on...

    If you do
    Code:
    sudo update-pciids
    sudo lshw -C video
    xrandr |awk '/connected/{print $1,$2}'
    What is the output of the lshw and xrandr commands? You can take pictures of that from a phone and post them as attachments(?)

    Or find out the IP and SSH into it, from another machine. Just ideas... That way you could just cut and paste the output. If that, then encapsolate the output within [ c o d e ] output_here [ / c o d e ] tags... (without the spaces I put between those characters to display that.)
    Last edited by MAFoElffen; July 5th, 2021 at 06:40 AM.

    Concurrent coexistance of Windows, Linux and UNIX...
    Ubuntu user # 33563, Linux user # 533637
    Sticky: [all variants] Graphics Resolution- Upgrade /Blank Screen after reboot
    UbuntuForums system-info Script

  9. #9
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    Re: Blank screen when rebooting

    The <Cntrl><Alt> <f(x)> keys does nothing (maybe i'm not pressing them at the right time)

    when i do the commands in the terminal it just says:

    Code:
    xrandr: Failed to get size of gamma for output default
    default connected
    lshw does not make an output. it just says:
    Code:
    USB
    SCSI
    Framebuffer devices
    and closes
    Last edited by hermansenn; July 5th, 2021 at 05:43 PM.

  10. #10
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    Re: Blank screen when rebooting

    Hmmm. "Framebuffer" would be the video.

    Let me ask my son... He has Raspberry Pi4 8GB. He himself uses Ubuntu Mate 20.04 LTS on it. He says that flavor already has the RaspBian hacks sripted in and included in that image... I remeber him telling me that the response/performance is a lot better than anything else he has found, running on his.

    Concurrent coexistance of Windows, Linux and UNIX...
    Ubuntu user # 33563, Linux user # 533637
    Sticky: [all variants] Graphics Resolution- Upgrade /Blank Screen after reboot
    UbuntuForums system-info Script

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