Created attachment 145795 [details]
Applet on which my screen blinks
NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols.
STEPS TO REPRODUCE
1. LMB on Networks icon on the system tray
2. LMB on my WiFi network that I'm connected to
Whole screen blinks not so frequently and no network speed is shown
I should see network speed.
(available in About System)
KDE Plasma Version: 5.23.4
KDE Frameworks Version: 5.89.0
Qt Version: 5.15.2
1) dmesg gives
NVRM: Xid (PCI:0000:01:00): 69, Class Error: ChId 000c, Class 00008297, Offset 000016ac, Data 00000060, ErrorCode 00000004
NVRM: os_schedule: Attempted to yield the CPU while in atomic or interrupt context
2) my GPU driver is nvidia-340.108
Created attachment 151560 [details]
The issue occurs also in plasma-systemmonitor, but only for the following sensor faces:
Sensor faces listed below work fine:
I've created a minimal test case in QML using SensorDataModel from org.kde.ksysguard.sensors and LineChart from org.kde.quickcharts trying to narrow down the issue but alas everything works without an issue.
I've modified org.kde.ksysguard.linechart to display a static chart, using an example at
but it fails in plasma-systemmonitor as well. It crashes eventually (.kcrash log attached).
I'm not sure what can influence the flickering and not really know Kirigami or KQuickCharts.
Could it be that they use extensions unsupported by my gpu driver like e.g. ARB_buffer_storage (my glxinfo attached)? Such bug has been solved at
Any ideas on what could be checked?
Created attachment 151561 [details]
I found a workaround and reported it at
I believe it might be a downstream issue.
I think it's not a downstream issue anymore. Line chart graphs worked on kquickcharts v5.85.0 and stopped on v5.86.0. My regression test gave following result. Please fix it.
00637f36bdedd2513a6264b3d1952d61c12bf312 is the first bad commit
Author: Arjen Hiemstra <email@example.com>
Date: Mon Aug 23 17:54:26 2021 +0200
Implement batching for Line chart material
This allows line chart segments and the respective material to be
batched, by sending per-segment data as vertex attributes rather than
Unfortunately, OpenGL 2.1/GLSL 1.10 doesn't support array vertex
attributes, so instead this emulates an array by simply defining a bunch
of vertex attributes and manually converting it to an output array.
src/scenegraph/LineChartMaterial.cpp | 110 +++++++------------------
src/scenegraph/LineChartMaterial.h | 33 +-------
src/scenegraph/LineChartNode.cpp | 6 +-
src/scenegraph/LineSegmentNode.cpp | 153 +++++++++++++++++++++++++++--------
src/scenegraph/LineSegmentNode.h | 4 +-
src/shaders/linechart.frag | 33 ++++----
src/shaders/linechart.vert | 69 ++++++++++++++--
7 files changed, 239 insertions(+), 169 deletions(-)
A possibly relevant merge request was started @ https://invent.kde.org/frameworks/kquickcharts/-/merge_requests/50
Git commit 541fc5e2a58887b3e2e9780291fe455220045323 by Łukasz Wojniłowicz.
Committed on 27/09/2022 at 15:29.
Pushed by wojnilowicz into branch 'master'.
Unpack points in the fragment shader of a line chart
M +23 -2 src/shaders/linechart.frag
M +14 -23 src/shaders/linechart.vert
M +22 -1 src/shaders6/linechart.frag
M +14 -23 src/shaders6/linechart.vert