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Thread: Black Screen After Changing Display Resolution

  1. #1
    Join Date
    Aug 2018
    Beans
    4

    Black Screen After Changing Display Resolution

    After changing Lubuntu 18.04 display resolution and rebooting, I will get only a black screen after logging on.

    I've tried adding "GRUB_GFXPAYLOAD_LINUX=1280x800" (or other resolutions such as 800x600) to /etc/default/grub file, following this https://askubuntu.com/questions/3515...-login-lubuntu but it didn't work.

    "xrandr" will give me "Can't open display".

    Does anybody have any idea how to troubleshoot this? (I'm new to Linux)

  2. #2
    Join Date
    Sep 2009
    Location
    Pennsylvania
    Beans
    2,184
    Distro
    Xubuntu

    Re: Black Screen After Changing Display Resolution

    A little info on your system may help: especially what video card do you hae, did you install any driver for it, and where did you get the driver from?

  3. #3
    Join Date
    Aug 2018
    Beans
    4

    Re: Black Screen After Changing Display Resolution

    I'm running Lubuntu 18.04 (x64) as a Virtual Box machine on Windows 7 (x64).

    Intel® HD Graphics 4000.

    I didn't install any driver for it.

  4. #4
    Join Date
    Aug 2018
    Beans
    4

    Re: Black Screen After Changing Display Resolution

    This VM is just a test to me and I could just reinstall the whole thing, but I'd like to take this as an opportunity to learn more. Although I don't understand why Lubuntu couldn't just "not let me" change the resolution to an unsupported one or at least warn me about it.

  5. #5
    Join Date
    Feb 2008
    Location
    Texas
    Beans
    25,604
    Distro
    Ubuntu 18.04 Bionic Beaver

    Re: Black Screen After Changing Display Resolution

    Thread moved to Virtualisation for a more appropriate fit.

  6. #6
    Join Date
    Apr 2009
    Beans
    3

    Re: Black Screen After Changing Display Resolution

    Delete this file:

    ~/.config/autostart/lxrandr-autostart.desktop

    reboot.

    Now retry other resolutions, only press SAVE if the new resolution tests ok (the 15 seconds warning, etc)

    If by accident you lose your desktop just remove lxrandr-autostart.desktop and reboot again.

  7. #7
    Join Date
    Aug 2018
    Beans
    4

    Re: Black Screen After Changing Display Resolution

    Quote Originally Posted by jorlando View Post
    Delete this file:

    ~/.config/autostart/lxrandr-autostart.desktop

    reboot.

    Now retry other resolutions, only press SAVE if the new resolution tests ok (the 15 seconds warning, etc)

    If by accident you lose your desktop just remove lxrandr-autostart.desktop and reboot again.
    Tank you, jorlando, but I've already deleted the VM.

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