Fractional scaling zooms to 200% and crops half the screen

[Alexandre Speltri]

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.
[IMAGE1]

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).
[IMAGE2]
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).[IMAGE3]

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-shell 3.36.1-5ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
Uname: Linux 5.4.0-26-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Mon Apr 27 02:49:29 2020
DisplayManager: gdm3
InstallationDate: Installed on 2020-04-27 (0 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
RelatedPackageVersions: mutter-common 3.36.1-3ubuntu3
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Daniel van Vugt (vanvugt)]

I'm finding it hard to see what the issue looks like other than a hint from looking at image3.jpg. Can you please attach more photos of the problem in better light?

[acspalmeiras (alexpalmeiras)]

This is how it looks like. Notice that it crops almost everything (after the time) at the top panel, the windows don't fit the screen real size and even the ubuntu dock is croped, I can't see "Show applications" at it's bottom.

[alex gtz (lucernalriver)]

If I take a screenshot, it looks normal. But I took a photo so you can see how it's being cropped. Looks like fractional scaling gets the correct scale but doesn't manage to fit it to the screen size. Hope this photo helps.

[alex gtz (lucernalriver)]

This is how a screenshot looks like for reference. If this could be squeezed into the monitor frame size the bug would be resolved.

[Daniel van Vugt (vanvugt)]

Duplicate bug 1876530 shows it can happen on an Intel-only system too.

[Daniel van Vugt (vanvugt)]

Nvidia users see also bug 1870736

[Peter Roelants (peter-roelants)]

Same Issue here on Lenovo P1 with Nvidia Quadro T1000 (see attached screenshot which is a picture of my secondary monitor).

I cannot use fractional scaling with a secondary monitor, the scaling zooms to 200% and crops part the screen on the secondary monitor.

I have had this issue with both 20.04 and 22.04 X-Window manager (Wayland doesn't even work on my Lenovo...)

[Peter Roelants (peter-roelants)]

Same Issue here on Lenovo P1 with Nvidia Quadro T1000 (see attached screenshot which is a picture of my secondary monitor).

I cannot use fractional scaling with a secondary monitor, the scaling zooms to 200% and crops part the screen on the secondary monitor.

I have had this issue with both 20.04 and 22.04 X-Window manager (Wayland doesn't even work on my Lenovo...)