Inconsistent cursor size with fractional scaling

[miromarszal]

When fractional scaling is enabled (I use 250%), the mouse cursor becomes very large when hovering over the desktop and in some applications. It returns to its normal size when moved over the panel, dock and most Gnome apps (evince is a notable exception here). The issue appeared after the update to 23.04.

ProblemType: Bug
DistroRelease: Ubuntu 23.04
Package: mutter 44.0-2ubuntu4
ProcVersionSignature: Ubuntu 6.2.0-20.20-generic 6.2.6
Uname: Linux 6.2.0-20-generic x86_64
ApportVersion: 2.26.1-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Fri May 5 15:41:32 2023
InstallationDate: Installed on 2019-10-31 (1282 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
SourcePackage: mutter
UpgradeStatus: Upgraded to lunar on 2023-05-05 (0 days ago)

[Daniel van Vugt (vanvugt)]

Workaround:

  gnome-extensions disable <email address hidden>

[Launchpad Janitor (janitor)]

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

[miromarszal (miromarszal)]

I'm not sure the problem is really in the extension. I tried the workaround of disabling desktop icons, and indeed the cursor went back to normal on the desktop. However, it's still larger than normal in some apps, including evince.

[Daniel van Vugt (vanvugt)]

desktop-icons-ng uses GTK3 so maybe that's the common factor? Basically any older GTK app that has to fake fractional scaling by being over-upscaled and then downscaled in the compositor.

[Arief Mulya Utama (arief-utama)]

Happen to me here also, 250% fractional scaling. Mouse scaling is off on some applications, such as SublimeText text editor, gnome-terminal (the old one, Console works fine)

[Arief Mulya Utama (arief-utama)]

Seems the bug only happens when using non integer fractional scaling (such as 2.5x or 250%). When using 2x (200%) mouse still scale ok. And when fractional scaling disabled and setting 200% scaling, also mouse ok.

Found the following errors when setting to 250% fractional scaling :

gnome-shell[4069]: Bug in client with pid 13356: Cursor buffer size (64x64) is not an integer multiple of the buffer_scale (3).

gnome-terminal-[9176]: ../../../gdk/wayland/gdkcursor-wayland.c:242 cursor image size (64x64) not an integermultiple of scale (3)

[Launchpad Janitor (janitor)]

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