The steam client's CEF windows don't support Ozone at the moment. We also composite these windows into a single SDL surface using the X11 composite extensions, so this change isn't really possible on the steam side.

I'm not really sure what changed on the mutter side. But it seems like it is causing problems for X11 based applications and it should be addressed there.

Any workaroud? Solution to this problem?

GNOME 47 includes a new experimental option in mutter, which changes the behavior of X11 apps scaling. From https://release.gnome.org/47/ :

GNOME 47 includes an enhanced fractional display scaling feature, which provides better support for legacy X11 apps. This feature is still considered experimental and should only be used for testing. To enable it, you can run the following from the command line: gsettings set org.gnome.mutter experimental-features '["scale-monitor-framebuffer", "xwayland-native-scaling"]'

This is enabled by default in Fedora 41 (just freshly released), so no need to enable it manually. Steam is no longer blurry with this change, but it is often sized incorrectly, mostly too small. So far, all other X11 apps seem to behave quite well out of the box (including Chrome, etc), I only saw this problem with Steam. This common issue description documents some workarounds for this problem:
https://discussion.fedoraproject.org/t/fractional-display-scaling-in-workstation-makes-some-apps-incorrectly-sized-impacts-games/90393

@kparal Thank you for pointing this out!

I've tried gsettings set org.gnome.mutter experimental-features '["scale-monitor-framebuffer", "xwayland-native-scaling"]', and it works, as Steam and VLC media player apps are not blurry anymore, however, I can't click on the app anymore. Seems like the mouse cursor is not synchronized or something. Also, I can't move the window/drag the window.

I read discussions on this MR: https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3567, they are talking about a "clickthrough" issue, that seems to be fixed? However it doesn't seems like the case?

EDIT: I've restarted my computer, and it seems to already work better. Will test that out, more, for the moment it is very promising to resolve the issue. :+1:

Your system information

• Steam client version (build number or date): 1732590255
• Distribution (e.g. Ubuntu): EndeavourOS
• Opted into Steam client beta?: Yes
• Have you checked for system updates?: Yes
• GPU: AMD

This issue is also present on KDE with fractional scaling enabled. Running at 150% scaling on a 4K display and you can see in the image below that steam fonts are blurry compared to other applications which are Wayland native.

Unsure if there's a KDE specific fix? But this issue seems to apply regardless of Wayland implementation. Not sure if I should open a new ticket.

@pfych what does this setting look like for you:

If it is set to 'Scaled by the system' that will cause blur.

I get sharp fractionally scaled experimental steam, or working experimental VRR, never both it would seem (Ubuntu)

If it is set to 'Scaled by the system' that will cause blur.

Swapping to "Apply scaling themselves" and restarting my computer fixed the issue on KDE

On Ubuntu/Gnome/Wayland 'gsettings set org.gnome.mutter experimental-features '["scale-monitor-framebuffer", "xwayland-native-scaling"]' ' is already enabled checking dconf. Steam UI / text is still blurry, GDK_SCALE=2 steam doesn't help.

Environment: Fractional Scaling 150%, Resolution HDPI 3840x2160, Ubuntu 24.10.

Observe text is fuzzy/blurry - Images look ok. Any environmental variable workaround would be appreciated :)

Greetings from Germany.

I am on a KDE Debian 4K Display with 150% Scaling.

At the Setting: Legacy Applications (X11), I checked the Apply Scaling themselves

Prompt change and fix, and now I can read ... I think.

Have fun ...