--- title: GNOME Mutter 51.rc Adds Cross-GPU Buffer Scan-Out... description: GNOME Mutter and GNOME Shell 51.rc release candidates have been tagged ahead of the formal GNOME 51 release. Mutter 51.rc adds cross-GPU buffer scan-out... canonical: https://daily.dev/posts/gnome-mutter-51-rc-adds-cross-gpu-buffer-scan-out-support-other-last-minute-work-v4lj4q0r0 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: GNOME Mutter 51.rc Adds Cross-GPU Buffer Scan-Out Support, Other Last Minute Work | daily.dev og:description: GNOME Mutter and GNOME Shell 51.rc release candidates have been tagged ahead of the formal GNOME 51 release. Mutter 51.rc adds cross-GPU buffer scan-out... og:url: https://daily.dev/posts/gnome-mutter-51-rc-adds-cross-gpu-buffer-scan-out-support-other-last-minute-work-v4lj4q0r0 og:image: https://api.daily.dev/og/posts/v4LJ4Q0r0.png og:image:alt: GNOME Mutter 51.rc Adds Cross-GPU Buffer Scan-Out Support, Other Last Minute Work og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # GNOME Mutter 51.rc Adds Cross-GPU Buffer Scan-Out Support, Other Last Minute Work **[Phoronix](https://daily.dev/sources/phoronix)** · 2 min read · 0 upvotes · 0 comments ## Summary GNOME Mutter and GNOME Shell 51.rc release candidates have been tagged ahead of the formal GNOME 51 release. Mutter 51.rc adds cross-GPU buffer scan-out support for better efficiency on multi-GPU setups like hybrid laptops, stylus eraser button configuration, Night Light support on hardware lacking GAMMA_LUT, client initial configuration overriding, and a configurable background blur effect policy (default blur radius 24, saturation 1.25, noise 0.015). It also fixes hardware cursor handling for SVG cursors, multi-monitor primary detection, HDR desaturation, an external monitor hot-plug hang, direct scan-out for DMA-BUF-less captures, and various memory leaks and crashes. GNOME Shell 51.rc now uses the Rust-based Glycin library to load and cache background images alongside direct scan-out fixes. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What new feature does GNOME Mutter 51 add for multi-GPU laptops? Mutter 51 introduces cross-GPU buffer scan-out support, aimed at improving efficiency on multi-GPU setups such as hybrid laptops. An automatic test attempts cross-GPU buffer scan-out, building on Mutter's earlier direct scan-out improvements. This lands in the 51.rc release candidate tagged alongside GNOME Shell 51.rc. _Track GNOME Mutter's evolving GPU scan-out support as it lands on daily.dev._ ### What is the default background blur configuration in Mutter 51? Mutter 51.rc's new background effect policy defaults to a blur radius of 24, saturation of 1.25, and noise of 0.015 for client-requested background blur. GNOME Shell or other compositors can override these visual parameters with their own values instead of relying on the defaults. _Follow GNOME compositor visual defaults like this on daily.dev when tuning desktop shells._ ### What library does GNOME Shell 51 use to load background images? GNOME Shell 51.rc switches to the Rust-based Glycin library for loading and caching background images, alongside fixes related to direct scan-out usage. This is part of the GNOME Shell 51.rc release candidate tagged together with Mutter 51.rc. _Keep up with Rust adoption inside GNOME internals like Glycin on daily.dev._ ## Similar posts on daily.dev - [GNOME Mutter 51 Beta Released With Wayland Background Blur, Improved Frame Scheduling](https://daily.dev/posts/gnome-mutter-51-beta-released-with-wayland-background-blur-improved-frame-scheduling-mwpknmadu) · Phoronix · 0 upvotes · 0 comments - [GNOME Mutter 50.1 Fixes Performance Regression For Some NVIDIA Driver Versions](https://daily.dev/posts/gnome-mutter-50-1-fixes-performance-regression-for-some-nvidia-driver-versions-rvnnnbqkl) · Phoronix · 0 upvotes · 0 comments --- Tags: [#linux](https://daily.dev/tags/linux), [#gpu](https://daily.dev/tags/gpu) [View this post on daily.dev](https://daily.dev/posts/gnome-mutter-51-rc-adds-cross-gpu-buffer-scan-out-support-other-last-minute-work-v4lj4q0r0) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"GNOME Mutter 51.rc Adds Cross-GPU Buffer Scan-Out Support, Other Last Minute Work","url":"https://daily.dev/posts/gnome-mutter-51-rc-adds-cross-gpu-buffer-scan-out-support-other-last-minute-work-v4lj4q0r0","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/gnome-mutter-51-rc-adds-cross-gpu-buffer-scan-out-support-other-last-minute-work-v4lj4q0r0"},"datePublished":"2026-09-02T13:07:47.564Z","dateModified":"2026-09-02T13:16:52.094Z","description":"GNOME Mutter and GNOME Shell 51.rc release candidates have been tagged ahead of the formal GNOME 51 release. 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