Wayland: tiny mouse cursor with 125% fractional scaling #105895

System Information
Operating system: Linux-6.2.6-1-default-x86_64-with-glibc2.37 64 Bits
Graphics card: Mesa Intel(R) UHD Graphics 620 (KBL GT2) Intel 4.6 (Core Profile) Mesa 23.0.0

Blender Version
Broken: version: 3.6.0 Alpha, branch: main, commit date: 2023-03-17 21:08, hash: 3eff28a158ca
Worked: -

Short description of error
Tiny mouse cursor inside blender while running in Wayland session (Windowing Environment: WAYLAND), as shown in the screen recording.

The only way to have a normal size mouse cursor at the moment is to enable zoom mode on my desktop, as shown in the screen recording.

*I use fractional scalling at 125% on my desktop (Wayland session).
*

Exact steps for others to reproduce the error

Open Blender.
Mouse cursor will be tiny regardless of any Interface > Display > Resolution Scale setting in Blender.

**System Information** Operating system: Linux-6.2.6-1-default-x86_64-with-glibc2.37 64 Bits Graphics card: Mesa Intel(R) UHD Graphics 620 (KBL GT2) Intel 4.6 (Core Profile) Mesa 23.0.0 **Blender Version** Broken: version: 3.6.0 Alpha, branch: main, commit date: 2023-03-17 21:08, hash: `3eff28a158ca` Worked: - **Short description of error** Tiny mouse cursor inside blender while running in Wayland session (Windowing Environment: WAYLAND), as shown in the screen recording. The only way to have a normal size mouse cursor at the moment is to enable zoom mode on my desktop, as shown in the screen recording. *I use fractional scalling at 125% on my desktop (Wayland session). * **Exact steps for others to reproduce the error** 1. Open Blender. 2. Mouse cursor will be tiny regardless of any Interface > Display > Resolution Scale setting in Blender.

2023-03-19 00-18-24.mp4

6.9 MiB

@ideasman42 , can you check?

It doesn't seem practical to resolve this on Blender's side, some notes:

Blender already supports fractional scaling on KDE/WLROOT's based compositors (RIVER works for e.g.).
Gnomes fractional scaling is marked as experimental. Ubuntu chose to enable this. By default, enabling gnome's fractional scaling requires setting the mutter option: experimental-features=['scale-monitor-framebuffer'].
Fractional scaling under Gnome makes the assumption the application does not support fractional scaling and renders a non-fractional scaled frame-buffer, then scales it down fractionally.
Wayland now supports wp-fractional-scale-v1 as a way to better access fractional scaling information, although compositors will need to support this so it can be tested to work properly in Blender.

As this is a limitation in an experimental feature, which will be resolved once newer API's are supported by Gnome, I've added this to our user manual as a "Known Limitation" - see: https://docs.blender.org/manual/en/3.6/getting_started/installing/linux_windowing_environment.html#known-limitations

Closing.

It doesn't seem practical to resolve this on Blender's side, some notes: - Blender already supports fractional scaling on KDE/WLROOT's based compositors (RIVER works for e.g.). - Gnomes fractional scaling is marked as *experimental*. Ubuntu chose to enable this. By default, enabling gnome's fractional scaling requires setting the mutter option: `experimental-features=['scale-monitor-framebuffer']`. - Fractional scaling under Gnome makes the assumption the application does not support fractional scaling and renders a non-fractional scaled frame-buffer, then scales it down fractionally. - Wayland now supports ``wp-fractional-scale-v1`` as a way to better access fractional scaling information, although compositors will need to support this so it can be tested to work properly in Blender. As this is a limitation in an experimental feature, which will be resolved once newer API's are supported by Gnome, I've added this to our user manual as a "Known Limitation" - see: https://docs.blender.org/manual/en/3.6/getting_started/installing/linux_windowing_environment.html#known-limitations Closing.

It turns out fractional scaling wasn't working on other non-gnome compositors such as RIVER. It was especially noticeable with a fractional scale of 1.01 for e.g. where the interface was scaled down around 50%.

I didn't realize this impacted RIVER as scales 1.5 and 1.75 worked well enough although they were not exactly correct either.

It turns out fractional scaling wasn't working on other non-gnome compositors such as RIVER. It was especially noticeable with a fractional scale of 1.01 for e.g. where the interface was scaled down around 50%. I didn't realize this impacted RIVER as scales 1.5 and 1.75 worked well enough although they were not exactly correct either.

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Wayland: tiny mouse cursor with 125% fractional scaling #105895