Plasma/Wayland Known Significant Issues: Difference between revisions

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This page tracks the Wayland showstoppers through out the stack
This page tracks the "Errata/Known issues" that are specific to the the Plasma Wayland session: significant quality-of-life annoyances, significant problems with workarounds, etc. This is part of KDE's [[Goals/Wayland|Wayland goal]].


== General issues ==
It is the Wayland-specific companion to [[Plasma/X11 Known Significant Issues]].
=== No vertical / horizontal maximize of Wayland native clients ===
KWin uses NetWM modes internally to do this. Works with Xwayland clients. Would also work for Wayland clients, just the state cannot be exported to Wayland (c.f. Quick tiling).


=== No Drag and Drop between Wayland native and Xwayland clients ===
From Wayland to Xwayland ignores. From Xwayland to Wayland falls through.


=== No remote support ===
== Session management ==
We don't have an API yet for remote support. Even if we had things like TeamViewer would not work any more.
* No session restore for native Wayland windows: https://bugs.kde.org/show_bug.cgi?id=436318. Our session management recovery engine is based on the [https://www.x.org/releases/X11R7.7/doc/libSM/xsmp.html X Session Management Protocol] and there is apparently currently no generic concept to do it on Wayland. But on Qt it's plugin-able and [https://wiki.gnome.org/Projects/SessionManagement/GnomeSession GNOME has had their own implementation] for some time.
* Session-restored XWayland windows go on the wrong screens and virtual desktops: https://bugs.kde.org/show_bug.cgi?id=468252 + https://bugs.kde.org/show_bug.cgi?id=421870


'''Partly fixed''' since we now have an API for screencast using a separate KWayland interface. There is also already support in xdg-desktop-portals for convenience of other apps and general support in Flatpaks. What's still missing is an API for remote input.
== KWin/compositing/window management ==
* When the compositor crashes or restarts, non-Qt apps are killed — Qt apps do stay alive, and work is ongoing to make other apps survive as well; see see https://invent.kde.org/plasma/kwin/-/wikis/Restarting
* Worse performance on weak Intel iGPUs: https://bugs.kde.org/show_bug.cgi?id=452119
* Picture-in-Picture windows from web browsers get a Task Manager icon and do not stay on top: https://bugs.kde.org/show_bug.cgi?id=463288; requires https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/132 and adoption in apps using PiP windows (like web browsers)
* Windows marked "Keep above other windows" cover up Meta+V Clipboard menu: https://bugs.kde.org/show_bug.cgi?id=462181
* Dialog Parent effect isn't working: https://bugs.kde.org/show_bug.cgi?id=460819
* Maximized XWayland windows have pixel gaps between screen edges when using a fractional scale factor: https://bugs.kde.org/show_bug.cgi?id=459373
* "Spare Layouts" feature not implemented: https://bugs.kde.org/show_bug.cgi?id=455431
* Using key combination shortcuts to type phrases into windows is not yet implemented: https://bugs.kde.org/show_bug.cgi?id=478219


=== NVIDIA ===
== Accessibility ==
The NVIDIA blob is not supported as it uses a custom EGL extension. It would require additional code just for NVIDIA. On the other hand many users are on NVIDIA. Further information: [https://blog.martin-graesslin.com/blog/2016/09/to-eglstream-or-not/ To EGL Stream or Not] and [https://blog.martin-graesslin.com/blog/2017/10/plasmawayland-and-nvidia-2017-edition/ Plasma/Wayland and NVIDIA – 2017 edition]
* Can't move pointer with numpad keys: https://bugs.kde.org/show_bug.cgi?id=478620
 
* Not all Sticky Keys options work: https://bugs.kde.org/show_bug.cgi?id=444335. Input on what is relevant/wanted there is welcome.
=== <s>QT_QPA_PLATFORM</s> ===
<s>QT_QPA_PLATFORM is set to wayland breaking any application which has Qt included (e.g. appimages, proprietary software) and doesn't have wayland QPA.</s>
 
'''Fixed'''
by not setting the variable in system, but let every app decide on itself. With 5.11 setting this variable is not needed at all anymore, because it autodetects the windowing system.
 
== Input ==
=== No (wacom) Tablet support ===
KWin lacks integration the tablet support from libinput. Also KWayland lacks wrapping the API for it.
 
=== No configurable gestures ===
X has the ability to accept fake input events to allow programs such as Easystroke. With the new security model of Wayland, such a program would need to be part of the compositor.
 
=== No XModmap ===
We lack a functionality like XModmap to remap keys. See [https://github.com/xkbcommon/libxkbcommon/issues/40 xkbcommon-issue40] --> Explain how this issue is related?


== Plasma ==
== Plasma ==
=== <s>Virtual Desktops</s> ===
* XWayland applications may not autostart properly in a Wayland session due to various important environment variables not being set: https://bugs.kde.org/show_bug.cgi?id=469839
<s>We don't have an API yet for virtual desktops, so pager is not working</s>
* XEmbedSNIProxy window eats input in top-left pixel of the screen: https://bugs.kde.org/show_bug.cgi?id=433079
 
* Global Menu is not supported for non-Qt apps: https://bugs.kde.org/show_bug.cgi?id=424485
'''Fixed''' in Plasma 5.15
* Installed Chrome apps are grouped together with Chrome windows in Icon-Only Task Manager: https://bugs.kde.org/show_bug.cgi?id=358277
 
* Plasma quits (doesn't crash) when too many windows are open: https://bugs.kde.org/show_bug.cgi?id=479492
=== Native Wayland windows are not restored ===
Session restoring does not include Wayland native windows. Our sessions management recover engine is based on the [https://www.x.org/releases/X11R7.7/doc/libSM/xsmp.html X Session Management Protocol] and there is apparently currently no generic concept to do it on Wayland. But on Qt it's plugin-able and GNOME has according to [https://wiki.gnome.org/Projects/SessionManagement/GnomeSession their wiki] an own implementation for some time.
 
=== No window thumbnails ===
We don't have an API yet for window thumbnails.
 
=== No window move on empty area in breeze ===
Broke with switch to XdgShellV6. Needs new API added to Qt (native interface), KWayland and Breeze.
 
=== Logout ===
[https://bugs.kde.org/show_bug.cgi?id=372789 There's a crash I know] (but fixing properly breaks X). [https://github.com/sddm/sddm/issues/897 Might be more stuff with SDDM], needs investigation
 
=== No activities ===
Activities are probably not a must-have feature, but anyway this is annoying for those who got accustomed to them on X11.
 
== Qt ==
=== No animated cursors ===
See [https://bugreports.qt.io/browse/QTBUG-48181 QTBUG-48181]
 
=== <s>wl_proxy_create_wrapper</s>  ===
<s>http://bugs.kde.org/381630</s>
 
'''Fixed''' in Qt 5.9.5
 
=== Key repeat not working ===
See [https://bugreports.qt.io/browse/QTBUG-55615 QTBUG-55615]
 
'''Fixed''' in Qt 5.13
 
=== Compose key not working ===
Will be fixed in Qt 5.11, [https://wiki.qt.io/Qt_5.11_Release expected May 2018]. See [https://bugreports.qt.io/browse/QTBUG-54792 QTBUG-54792]


'''Fixed''' in Qt 5.11
== NVIDIA ==
* Transient graphical glitches after waking from sleep: https://bugs.kde.org/show_bug.cgi?id=448866
* Transient graphical glitches after changing themes: https://bugs.kde.org/show_bug.cgi?id=470503


=== No tablet support ===
== Upstream ==
QtWayland does not yet support the tablet API. So even if KWin had support Qt would not be able to use it.
=== Not yet fixed ===
* With screen scaling, cursor size is incorrect when hovering over native Wayland apps written with the GTK toolkit due to its lack of support for the cursor-shape-v1 protocol: https://bugs.kde.org/show_bug.cgi?id=451158. See also https://bugs.kde.org/show_bug.cgi?id=459161 for general cursor size issues.
* With a high DPI mouse, some applications might experience instability or unresponsiveness: https://gitlab.freedesktop.org/wayland/wayland/-/issues/443
=== Fixed or work in progress ===
* With NVIDIA GPU, Plasma popups (e.g. Kickoff and KRunner) sometimes stops showing after opening / closing them a few times: https://bugs.kde.org/show_bug.cgi?id=455913 / https://codereview.qt-project.org/c/qt/qtwayland/+/503674 (Fixed in KWin for Qt <= 6.6.2, Fixed in Qt 6.6.3)
* When using a Chromium-based browser in native Wayland mode, dragging an image to the desktop creates a sticky note out of it: https://bugs.kde.org/show_bug.cgi?id=449645 / https://codereview.qt-project.org/c/qt/qtwayland/+/518017 (Fixed in Qt 6.6) / https://codereview.qt-project.org/c/qt/qtwayland/+/518018 (Not yet merged)
* When dragging images from Firefox to the desktop, have to hold the drag 1 or more seconds over the desktop before releasing or else the desktop drop menu does not appear: https://bugs.kde.org/show_bug.cgi?id=448867 - https://codereview.qt-project.org/c/qt/qtwayland/+/518019 (Fixed in Qt 6.7)
* Quick tile actions and window rules cannot override window's minimum size if needed as they can on X11: https://bugs.kde.org/show_bug.cgi?id=434615 / https://codereview.qt-project.org/c/qt/qtwayland/+/524982 (Fixed in Qt 6.7)
* Wrong app icon in Task Switcher for LibreOffice apps: https://bugreports.qt.io/browse/QTBUG-77182 (Workaround implemented: https://gerrit.libreoffice.org/c/core/+/163249 )
* When dragging files, to trigger a specific result, you have to hold down a modifier key *before* you start dragging, not after: https://bugs.kde.org/show_bug.cgi?id=423031 - https://codereview.qt-project.org/c/qt/qtwayland/+/525413 (Not yet merged)
* QtQuick windows exhibit jittery resizing: https://bugs.kde.org/show_bug.cgi?id=477900 - https://codereview.qt-project.org/c/qt/qtwayland/+/503676 (Work in progress)


=== Fullscreen does not work ===
== Fixed upstream ==
see [https://bugreports.qt.io/browse/QTBUG-63748 QTBUG-63748]
These are fixed upstream but neither backportable nor backported to Qt 5. The issues listed in this section will not affect Plasma 6 or newer.


'''Fixed''' in Qt 5.12
* plasmashell crashes when hovering or clicking items on the Panel due to "zwp_linux_buffer_params_v1.add" protocol error: https://bugs.kde.org/show_bug.cgi?id=447717; fixed in Qt 6.3
* Wrong positioning of context menu in multiple screens: https://bugs.kde.org/show_bug.cgi?id=436016 / https://bugreports.qt.io/browse/QTBUG-85297; fixed in Qt 6.4
* When using a fractional scale factor, native Wayland apps are slightly blurry: https://bugs.kde.org/show_bug.cgi?id=446674; fixed in Qt 6.6
* Changing scale causes Qt-based software to become blurry until restarted: https://bugreports.qt.io/browse/QTBUG-78327; fixed in Qt 6.6
* Apps using QDesktopServices::openUrl()/Qt.openUrlExternally don't raise existing windows in the activated app: https://codereview.qt-project.org/c/qt/qtwayland/+/321246 and https://codereview.qt-project.org/c/qt/qtbase/+/447556; fixed in Qt 6.5
* QMenus appear as standalone windows when opened using a stylus: https://bugreports.qt.io/browse/QTBUG-111130; fixed in Qt 6.6 - https://github.com/qt/qtwayland/commit/59fae923d72eaf640035237ae6ddb1ccfeba2210
* After dragging-and-dropping a Favorites app in Kickoff, next click anywhere launches that thing: https://bugs.kde.org/show_bug.cgi?id=444489 - Fixed in Qt 6.5
* When the compositor crashes or restarts, Qt apps are killed - Fixed in Qt 6.6
* In multi-monitor setups with at least one scaled display, Context menus have items which are invisible until hovered: https://bugreports.qt.io/browse/QTBUG-93380 - Fixed in Qt 6.6
* When logging into a Wayland session after having previously used the X11 session, all outputs have their scales reset to 100%: https://bugs.kde.org/show_bug.cgi?id=433460
* Context menu text becomes is blurry until interacted with on scaled displays in multi-display setups: https://bugs.kde.org/show_bug.cgi?id=451259
* Some Plasma icons are blurry until interacted with mixed-dpi multi-screen setup: https://bugs.kde.org/show_bug.cgi?id=460493
* QDockWidget does not visually move when moving and is not re-dockable when detached: https://bugreports.qt.io/browse/QTBUG-87332 - fixed in Qt 6.6
* Plasma and apps crash when dragging anything into another app: https://bugs.kde.org/show_bug.cgi?id=470925 - fixed in Qt 6.6
* Unusably poor performance on external screens with NVIDIA Optimus setup: https://bugs.kde.org/show_bug.cgi?id=452219 - NVidia will release a driver that fixes this before Plasma 6.0 is released
* With screen scaling, cursor size was incorrect when hovering over Chromium-based browsers and Electron apps with native Wayland support enabled: cursor-shape-v1 protocol was implemented in Chromium 122: crrev.com/c/5196950, available in Electron 29: https://github.com/electron/electron/releases/tag/v29.0.0

Latest revision as of 22:02, 27 February 2024

This page tracks the "Errata/Known issues" that are specific to the the Plasma Wayland session: significant quality-of-life annoyances, significant problems with workarounds, etc. This is part of KDE's Wayland goal.

It is the Wayland-specific companion to Plasma/X11 Known Significant Issues.


Session management

KWin/compositing/window management

Accessibility

Plasma

NVIDIA

Upstream

Not yet fixed

Fixed or work in progress

Fixed upstream

These are fixed upstream but neither backportable nor backported to Qt 5. The issues listed in this section will not affect Plasma 6 or newer.