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Thread: Grub "NOMODESET" question Ubuntu 21.04 Blinking Monitor on start

  1. #1
    Join Date
    Nov 2013
    Ubuntu 20.04 Focal Fossa

    Grub "NOMODESET" question Ubuntu 21.04 Blinking Monitor on start

    Good Morning Good Afternoon or Good Night all,

    I'm running into an intermittent problem. Occasionally, I start my system and I get the POST screen and then it just goes blank after that. I have to cold power off and restart the process.. After that, it seems to work again. It's sort of a crap shoot when it does it.

    The fix, I have discovered, is to edit grub to "NOMODESET". This does in fact work. I do find the results a bit unsatisfactory however. I have discovered that when that switch is made, it defaults to X11 instead of Wayland.

    I have grown to like Wayland. It just seems like a smoother experience and playing videos on youtube and such uses a few fewer CPU cycles than in X11. Is there a way to consistently get this fixed without the undesired NOMODESET fix? Something my Google-Fu hasn't come up with?

    Here's my graphics card info if it's relevant. More details can be provided if needed.

    description: VGA compatible controller
    product: Oland [Radeon HD 8570 / R5 430 OEM / R7 240/340 / Radeon 520 OEM]
    vendor: Advanced Micro Devices, Inc. [AMD/ATI]
    physical id: 0
    bus info: pci@0000:01:00.0
    version: 87
    width: 64 bits
    clock: 33MHz
    capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
    configuration: driver=radeon latency=0
    resources: irq:129 memory:a0000000-afffffff memory:b1100000-b113ffff ioport:3000(size=256) m

  2. #2
    Join Date
    Jan 2006
    Sunny Southend-on-Sea
    Kubuntu 20.04 Focal Fossa

    Re: Grub "NOMODESET" question Ubuntu 21.04 Blinking Monitor on start

    nomodeset is a nuclear option; it's not a good choice for running permanently.

    It seems feasible that the times you're panicking about the blank screen, the system's just doing an automatic fsck, and the text mode resolution isn't supported by your monitor. What happens if you just leave it?


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