https://bugs.kde.org/show_bug.cgi?id=468715
Bug ID: 468715
Summary: High CPU usage w/ kwin_wayland while in VT (text
console)
Classification: Plasma
Product: kwin
Version: git-stable-Plasma/5.27
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: ua_bugz_...@binary-island.eu
Target Milestone: ---
Created attachment 158230
--> https://bugs.kde.org/attachment.cgi?id=158230&action=edit
a "perf record -g -T -P --running-time" for the kwin_wayland process w/ high
cpu usage
SUMMARY
While I was working to fix a different kwin bug for the past several weeks, I
came across this very annoying and consistent (as-in: happens almost 100% of
time time) behavior: Switching to the VT (text console) while running
kwin_wayland, will result in kwin_wayland eating betweet 40%-50% CPU until I
switch back.
STEPS TO REPRODUCE
1. Start kwin_wayland (as part of the plasma desktop)
2. Move the mouse around
3. Switch to the VT (text console)
OBSERVED RESULT
High CPU usage of kwin_wayland
EXPECTED RESULT
kwin_wayland should be idle
SOFTWARE/OS VERSIONS
KDE Plasma Version: 5.27.4
KDE Frameworks Version: 5.106.0
KWin Support Information:
The following information should be used when requesting support on e.g.
https://forum.kde.org.
It provides information about the currently running instance, which options are
used,
what OpenGL driver and which effects are running.
Please post the information provided underneath this introductory text to a
paste bin service
like https://paste.kde.org instead of pasting into support threads.
==========================
Version
=======
KWin version: 5.27.4
Qt Version: 5.15.9
Qt compile version: 5.15.9
XCB compile version: 1.15
Operation Mode: Xwayland
Build Options
=============
KWIN_BUILD_DECORATIONS: yes
KWIN_BUILD_TABBOX: yes
KWIN_BUILD_ACTIVITIES: yes
HAVE_X11_XCB: yes
HAVE_EPOXY_GLX: yes
X11
===
Vendor: The X.Org Foundation
Vendor Release: 12301001
Protocol Version/Revision: 11/0
SHAPE: yes; Version: 0x11
RANDR: yes; Version: 0x14
DAMAGE: yes; Version: 0x11
Composite: yes; Version: 0x4
RENDER: yes; Version: 0xb
XFIXES: yes; Version: 0x50
SYNC: yes; Version: 0x31
GLX: yes; Version: 0x0
Decoration
==========
Plugin: org.kde.breeze
Theme:
Plugin recommends border size: None
onAllDesktopsAvailable: true
alphaChannelSupported: true
closeOnDoubleClickOnMenu: false
decorationButtonsLeft: 0, 2
decorationButtonsRight: 6, 3, 4, 5
borderSize: 0
gridUnit: 10
font: Noto Sans,10,-1,5,50,0,0,0,0,0
smallSpacing: 2
largeSpacing: 10
Output backend
==============
Name: DRM
Active: true
Atomic Mode Setting on GPU 0: true
Cursor
======
themeName: breeze_cursors
themeSize: 24
Options
=======
focusPolicy: 0
xwaylandCrashPolicy:
xwaylandMaxCrashCount: 3
nextFocusPrefersMouse: false
clickRaise: true
autoRaise: false
autoRaiseInterval: 0
delayFocusInterval: 0
shadeHover: false
shadeHoverInterval: 250
separateScreenFocus: false
activeMouseScreen: true
placement:
activationDesktopPolicy: 0
focusPolicyIsReasonable: true
borderSnapZone: 10
windowSnapZone: 10
centerSnapZone: 0
snapOnlyWhenOverlapping: false
rollOverDesktops: true
focusStealingPreventionLevel: 1
operationTitlebarDblClick: 5000
operationMaxButtonLeftClick: 5000
operationMaxButtonMiddleClick: 5015
operationMaxButtonRightClick: 5014
commandActiveTitlebar1: 0
commandActiveTitlebar2: 28
commandActiveTitlebar3: 2
commandInactiveTitlebar1: 4
commandInactiveTitlebar2: 28
commandInactiveTitlebar3: 2
commandWindow1: 7
commandWindow2: 8
commandWindow3: 8
commandWindowWheel: 28
commandAll1: 10
commandAll2: 3
commandAll3: 14
keyCmdAllModKey: 16777250
condensedTitle: false
electricBorderMaximize: true
electricBorderTiling: true
electricBorderCornerRatio: 0.25
borderlessMaximizedWindows: false
killPingTimeout: 5000
hideUtilityWindowsForInactive: true
compositingMode: 1
useCompositing: true
hiddenPreviews: 1
glSmoothScale: 2
glStrictBinding: false
glStrictBindingFollowsDriver: true
glPreferBufferSwap: 99
glPlatformInterface: 2
windowsBlockCompositing: true
latencyPolicy:
renderTimeEstimator:
allowTearing: true
Screen Edges
============
desktopSwitching: true
desktopSwitchingMovingClients: true
cursorPushBackDistance: 1x1
timeThreshold: 300
reActivateThreshold: 350
actionTopLeft: 0
actionTop: 0
actionTopRight: 0
actionRight: 0
actionBottomRight: 0
actionBottom: 0
actionBottomLeft: 0
actionLeft: 0
Screens
=======
Active screen follows mouse: yes
Number of Screens: 1
Screen 0:
---------
Name: HDMI-A-1
Enabled: 1
Geometry: 0,0,2560x1440
Scale: 1.5
Refresh Rate: 60000
Adaptive Sync: incapable
Compositing
===========
Compositing is active
Compositing Type: OpenGL
OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: NVIDIA GeForce GTX 1080/PCIe/SSE2
OpenGL version string: 3.1.0 NVIDIA 530.41.03
OpenGL platform interface: EGL
OpenGL shading language version string: 1.40 NVIDIA via Cg compiler
Driver: NVIDIA
Driver version: 530.41.3
GPU class: Unknown
OpenGL version: 3.1
GLSL version: 1.40
Linux kernel version: 6.2.2
Direct rendering: Requires strict binding: no
GLSL shaders: yes
Texture NPOT support: yes
Virtual Machine: no
OpenGL 2 Shaders are used
Loaded Effects:
---------------
colorpicker
outputlocator
screenshot
kwin4_effect_sessionquit
kwin4_effect_login
kwin4_effect_logout
kwin4_effect_windowaperture
magiclamp
slide
slideback
kwin4_effect_maximize
kwin4_effect_fullscreen
kwin4_effect_scale
kwin4_effect_fadingpopups
kwin4_effect_frozenapp
kwin4_effect_morphingpopups
kwin4_effect_dialogparent
desktopgrid
highlightwindow
overview
tileseditor
windowview
blendchanges
startupfeedback
kscreen
screentransform
Currently Active Effects:
-------------------------
Effect Settings:
----------------
colorpicker:
outputlocator:
screenshot:
kwin4_effect_sessionquit:
pluginId: kwin4_effect_sessionquit
isActiveFullScreenEffect: false
kwin4_effect_login:
pluginId: kwin4_effect_login
isActiveFullScreenEffect: false
kwin4_effect_logout:
pluginId: kwin4_effect_logout
isActiveFullScreenEffect: false
kwin4_effect_windowaperture:
pluginId: kwin4_effect_windowaperture
isActiveFullScreenEffect: false
magiclamp:
slide:
horizontalGap: 45
verticalGap: 20
slideBackground: false
slideback:
kwin4_effect_maximize:
pluginId: kwin4_effect_maximize
isActiveFullScreenEffect: false
kwin4_effect_fullscreen:
pluginId: kwin4_effect_fullscreen
isActiveFullScreenEffect: false
kwin4_effect_scale:
pluginId: kwin4_effect_scale
isActiveFullScreenEffect: false
kwin4_effect_fadingpopups:
pluginId: kwin4_effect_fadingpopups
isActiveFullScreenEffect: false
kwin4_effect_frozenapp:
pluginId: kwin4_effect_frozenapp
isActiveFullScreenEffect: false
kwin4_effect_morphingpopups:
pluginId: kwin4_effect_morphingpopups
isActiveFullScreenEffect: false
kwin4_effect_dialogparent:
pluginId: kwin4_effect_dialogparent
isActiveFullScreenEffect: false
desktopgrid:
activeView:
gridRows: 2
gridColumns: 4
animationDuration: 300
layout: 1
partialActivationFactor: 0
gestureInProgress: false
showAddRemove: true
desktopNameAlignment: 0
desktopLayoutMode: 0
customLayoutRows: 2
highlightwindow:
overview:
activeView:
animationDuration: 300
layout: 1
ignoreMinimized: false
blurBackground: true
partialActivationFactor: 0
gestureInProgress: false
searchText:
tileseditor:
activeView:
animationDuration: 200
windowview:
activeView:
animationDuration: 300
layout: 1
ignoreMinimized: false
mode: 1
partialActivationFactor: 0
gestureInProgress: false
searchText:
blendchanges:
startupfeedback:
type: 1
kscreen:
screentransform:
Loaded Plugins:
---------------
kwin5_plugin_buttonrebinds
kwin5_plugin_colord
kwin5_plugin_krunner
kwin5_plugin_nightcolor
kwin5_plugin_screencast
Available Plugins:
------------------
kwin5_plugin_buttonrebinds
kwin5_plugin_colord
kwin5_plugin_krunner
kwin5_plugin_nightcolor
kwin5_plugin_screencast
ADDITIONAL INFORMATION
I have been trying to debug and fix this myself but since my knowledge of kwin
in that area is rather basic, it would take me quite a bit more time than
someone more experienced to properly figure out what is happening here. :-(
What I was able to figure out is that kwin is still trying to commit the
pipeline and present while in the VT. I assume that should not happen and kwin
should be idle until it is in the foreground again?
It is also spamming the log with while in the VT:
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm: Atomic test
failed! Invalid argument
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm: Drm objects:
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm: "connector" 78
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm:
"CRTC_ID": 0->41
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm:
"non-desktop": 0
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm: "DPMS":
0
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm: "EDID":
91
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm:
"vrr_capable": 0
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm:
"link-status": 0
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm: "crtc" 41
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm:
"MODE_ID": 0->93
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm:
"ACTIVE": 0->1
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm:
"VRR_ENABLED": 0
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm: "plane" 35
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm: "type":
1
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm: "SRC_X":
0
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm: "SRC_Y":
0
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm: "SRC_W":
3840
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm: "SRC_H":
2160
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm:
"CRTC_X": 0
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm:
"CRTC_Y": 0
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm:
"CRTC_W": 3840
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm:
"CRTC_H": 2160
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm: "FB_ID":
0->92
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm:
"CRTC_ID": 0->41
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm:
"rotation": 1
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm:
"IN_FORMATS": 36
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm: "plane" 38
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm: "type":
2
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm: "SRC_X":
0
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm: "SRC_Y":
0
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm: "SRC_W":
256
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm: "SRC_H":
256
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm:
"CRTC_X": 0
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm:
"CRTC_Y": 0
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm:
"CRTC_W": 256
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm:
"CRTC_H": 256
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm: "FB_ID":
0
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm:
"CRTC_ID": 0
Apr 20 14:53:27 TARDIS kwin_wayland[259273]: kwin_wayland_drm:
"IN_FORMATS": 39
I have done a perf record (w/ call graph recording), that shows were the time
is spent. I will attach it to this bug (and hope it does not contain any
sensitive data).
If there is anything further I can do to help, please just let me know...
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