SUMMARY When clicking Color Picker button to choose a color from screen, while in color picking mode, it causes high CPU usage, other apps becoming unresponsive, observed behavior as an example: - Had a voice chat, I stopped hearing any audio from it until exiting color picking mode - Were connected once through a remote connection, the app thought my PC is not even connected to the internet anymore after trying to pick a color. - CPU fan speed rising up after few seconds, indicating high CPU usage. STEPS TO REPRODUCE 1. Add Color Picker from Widgets 2. Click on dropper button OBSERVED RESULT High CPU usage, to point of causing other applications to halt until closing this mode. EXPECTED RESULT moderate CPU usage and letting other apps to continue working. SOFTWARE/OS VERSIONS Operating System: EndeavourOS (based on Archlinux) KDE Plasma Version: 5.26.1 KDE Frameworks Version: 5.99.0 Qt Version: 5.15.6 Kernel Version: 6.0.2-arch1-1 (64-bit) ADDITIONAL INFORMATION Graphics Platform: X11
Cannot reproduce; no CPU spike for me when I click on the dropper but don't pick a color yet.
A small update, not entire CPU is being used but seems only one or two physical cores is getting 100% usage by process called plasmashell when I use the color picker. Also trying to record with OBS shows me that Nvidia nvenc encoder failed to respond in 5 seconds, timed out. So it seems to be related to display, not particularly CPU. Again, halts my other apps, Discord for example. It could be me using nvidia gpu, but I'm not sure. Is there a way to profile a widget, without compiling and all that?
I have amdgpu and also cannot reproduce. Should blame NVIDIA.
Can reproduce with NVIDIA, WTF. Apps being unresponsive is kinda expected side effect, because color picker "freezes" the picture via KWin effects, and lets you select a color. But I certainly didn't expect them to become so unresponsive, up to the point that System Monitor -> History page don't get updated which the picture is "frozen". I can hear the fans go brrrr tho
Is this still happening for you in Plasma 6?
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This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!