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I'm using Ubuntu 20.04 with a NVIDIA MX250. Firstly, nvidia-prime was not working. Even when selecting nvidia only, it was using Intel HD Graphics.

enter image description here

I've forced the use of NVIDIA as the primary GPU by creating /etc/X11/xorg.conf.d/10-nvidia-drm-outputclass.conf with: Option "PrimaryGPU" "yes" (seen here https://wiki.archlinux.org/index.php/NVIDIA_Optimus). enter image description here

This works, now nvidia-settings show all options (before was showing only prime options, and nothing more - even when selecting NVIDIA Only).

But now, fractional scalling crops half of the screen. The funny thing is that when I try to printscreen, on the picture it looks fine, but in reality is not. I had to make a photo with my cellphone. As you can see, elements don't fit the screen (Note firefox title bar, for example).enter image description here

I really need fractional scalling, because everything is really small. KDE works fine, but I don't like it. And font scalling is not really good.

Thanks!

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It's actually a confirmed bug: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1875285

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