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KDE Plasma 6.6.5 has been released as the newest maintenance update for the Plasma 6.6 branch, which originally debuted in February 2026. This update is focused solely on stability improvements and bug fixes across the desktop environment.
A large portion of the work targets KWin, which gains multiple fixes related to display management and rendering. The update improves DRM output handling by refreshing only GPUs that have changed, preventing unsupported format copies on multi-GPU setups, and correcting problems involving custom output mode restoration and saving. KDE developers have also refined display mode matching behavior.
The release further improves fullscreen support in the X11 backend, restores proper layer updates for fullscreen applications, enhances interactive display resizing, and maps input devices directly to hardware outputs rather than logical ones. Users with NVIDIA graphics cards also receive a correction that enables full RGB color range support.
KScreen receives several display configuration enhancements as well. The settings module now hides the DDC/CI option whenever HDR is active, eliminates gaps that could appear while creating mirrored displays, and fixes an off-by-one issue affecting output handling.
The Kickoff launcher has also been refined. Categories can now be opened using the Return key, unnecessary sidebar scrollbars are no longer shown when no display is detected, and drag-and-drop operations no longer accidentally trigger the launcher.
Additional fixes improve submenu background transparency, tablet configuration line rendering, initial tablet positioning, keyboard settings button placement, and KRunner integration with plasma-systemmonitor actions.
Within Plasma Workspace, several desktop usability improvements are included. Kickoff now inserts a separator after recent files supplied by the service runner, font settings controls are easier to access, and transparency issues affecting XEmbed system tray icons have been corrected.
The update also improves support for newer logind states, enhances logout screen readability in themes like Air and Breeze Light, and ensures clipboard entries are properly updated in Klipper when moved to the top of the history list. Locale suffix matching in region and language settings has been corrected, while notification handling gains additional safeguards against null-related issues.
For users running multiple displays, Plasma 6.6.5 resolves a race condition affecting lock screen timezone initialization. KDE has also fixed outdated transition metadata problems that could appear after timezone changes.
Powerdevil fixes a bug where display brightness could become locked at 30% following a reboot. Meanwhile, Spectacle now stays active briefly after copying screenshots to avoid issues with clipboard captures.
Plasma NetworkManager gains accessibility improvements for toggle switches, keeps focus on password fields when hovering over other network entries, and removes lingering placeholder text when the applet closes. In addition, Plasma Login Manager now waits for udev initialization before launching plasmalogin and fixes connection leaks that could occur when greeter windows were destroyed.
Finally, Discover includes small fixes for progress text color handling and rpm-ostree integration. KDE also ships additional corrections across Breeze, Oxygen, Plasma Addons, kglobalacceld, plasma-integration, plasma-keyboard, Plasma Mobile, print-manager, qqc2-breeze-style, and xdg-desktop-portal-kde.
For more details, see the release announcement or check out the full changelog. The next release, KDE Plasma 6.7, is expected in about a month, in mid-June.
