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OS: Ubuntu 20.04 LTS; Graphics: GeForce GTX 1060 6GB/PCle/SSE2; Monitor: ASUS PB287Q; Port: Display Port;

I just installed Ubuntu 20.04 LTS and attempted to apply fractional scaling to the display.

When changing the display scale option to 150%, the screen went blank/black for roughly 10 seconds and then came back and showed an error, without the scaling applied.

With the fractional scale option still selected, I changed to 200%, and then the screen went blank and stayed that way.

After turning my PC off and on again, I can login normally, but after logging in, the screen turns blank again and I can't do anything.

I could just re-install the system, but I'm hoping for a solution in case I face this problem again in the future.

leto
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5 Answers5

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Just to add a bit more to Wagner Michael's answer:

The following was performed successfully on Ubuntu 20.04:

  1. Boot into Ubuntu Recovery mode.

  2. Select "Drop into root user"

  3. sudo su - [Insert your username]

  4. gsettings get org.gnome.mutter experimental-features

    • Output should be = "['x11-randr-fractional-scaling']"

  5. gsettings set org.gnome.mutter experimental-features "[]"

  6. reboot

Fixed.

Minimul
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Disabling fractional scaling via command line has done the job for me:

gsettings set org.gnome.mutter experimental-features "[]"

Before experimental-features was set to "['x11-randr-fractional-scaling']" in my case.

Wagner Michael
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Either you go into a different tty at boot (Ctrl+Alt+F2) or you do it from recovery mode and dropping into the root prompt. Either way, all you have to do is type:

rm .config/monitors.xml

To get rid of the fractional scaling config

Gerard
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If you get an error (as I did ) when gsettings set ...

to the effect cannot launch autolaunch d-bus without x-11 DISPLAY use

dbus-launch gsettings set org.gnome.mutter experimental-features "[]"
Paul Clinch
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Go into Terminal at the login screen, remove the file .config/dconf/user and then sudo reboot. I think it resets the display settings to default.

This fixed my problem -- setting a fractional scaling and then black screen after login.

See Black screen after logging in, after upgrading to 20.04

yueqiw
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