SUMMARY I've been trying the experimental wp_fractional_scale_manager_v1 support to see if things looked sharper, and was surprised to see it perform much worse than downscaling. Apps using this protocol look blurry, and in the case of Firefox, some UI elements even break. STEPS TO REPRODUCE 1. Apply 150% of scaling (I'm using a 32" 4K monitor). 2. Run GNOME Clocks 45.0 with GTK 4.12.4 and the env `GDK_DEBUG=gl-fractional`. 3. Notice the blurriness of the entire app. Using the same scaling: 1. Run Firefox 119.0.1. 2. Set the about:config flag `widget.wayland.fractional-scale.enabled` to true. 3. Restart Firefox. 4. Observe the blurriness and broken menus. OBSERVED RESULT Things blurry and broken. :( EXPECTED RESULT Thinks ultra crisp and sharp. :) SOFTWARE/OS VERSIONS Linux/KDE Plasma: Parabola (available in About System) KDE Plasma Version: 5.27.8 KDE Frameworks Version: 5.112.0 Qt Version: 5.15.11 ADDITIONAL INFORMATION
Created attachment 163410 [details] GNOME Clocks with wp_fractional_scale_manager_v1
Created attachment 163411 [details] GNOME Clocks without wp_fractional_scale_manager_v1
Created attachment 163412 [details] Firefox without wp_fractional_scale_manager_v1
Created attachment 163413 [details] Firefox with wp_fractional_scale_manager_v1
Do you know if you have similar issues with Qt6 apps? Can you share your monitor resolution?
Ran gnome clocks with a scale of 1.25: client window geometry = 61, 55, 870x690 buffer is: 1240x1015 in logical space: buffer geometry is: 992x812 frame geometry is: 870x690
Do you know if there's a way to force the GTK apps to use server side decorations? I have a theory on what's up that it would be good to determine
I ran with kwin's debug shader that shows when surfaces are stretched or not-pixel aligned. Environment="KWIN_SCENE_VISUALIZE=fractional" gnome-clocks had no traces, other than on the cursor. That strongly implies that any blurriness is a fault of GTK's rendering rather than kwin. I don't think this is actionable unless we see this app looking amazing in mutter/sway.
(In reply to David Edmundson from comment #5) > Do you know if you have similar issues with Qt6 apps? Qt6 apps don't look blurry by default, but they don't look super sharp either. Do I need to enable some flag for them to use the protocol? > Can you share your monitor resolution? It's a standard 4K monitor: 3840x2160. I'm using it at 150% scale. > Do you know if there's a way to force the GTK apps to use server side decorations? > I have a theory on what's up that it would be good to determine I have no idea, to be honest. I looked it up and couldn't find anything.
>Qt6 apps don't look blurry by default, but they don't look super sharp either. No, it should just work for anything 6.6 onwards
(In reply to David Edmundson from comment #10) > No, it should just work for anything 6.6 onwards Telegram is based on Qt6, and yet it renders at 200% (unlike in X11, where it correctly renders at 150%).
Created attachment 163583 [details] Telegram rendering at 100% in Wayland
Telegram does their own thing. It's not a good test of the stock toolkit capabilities
Dear Bug Submitter, This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information as soon as possible and set the bug status as REPORTED. Due to regular bug tracker maintenance, if the bug is still in NEEDSINFO status with no change in 30 days the bug will be closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging If you have already provided the requested information, please mark the bug as REPORTED so that the KDE team knows that the bug is ready to be confirmed. Thank you for helping us make KDE software even better for everyone!
This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!