SUMMARY Please refer additional to https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1041044 (The bug is not related to Mozilla Firefox, but it occurs most often using it.) It seems that webpages with intense graphics can cause the system freeze. But there are other events where the system freezes obvious in other applications. it is possible to login remote from another PC, so the kernel and OS is still alive. Requesting a kill of a process or a shutdown does not work - a hard reset of the PC is needed. In many cases the process plasmashell is going into 100% cpu usage. When another process is going into 100% cpu usage (like Firefox) and it is killed, then plasmashell goes into 100% cpu usage. There is another PC running Debian 12 that has sometimes the same freeze problem, so it is not a hardware problem. Any tips how to debug this would be helpful and will be reported. STEPS TO REPRODUCE It is a big problem that there is no specific application or reproductive steps to freeze the system. The best way is to use Firefox with intense graphic sites, like windy.com, starting a video of the wheather situation for 2 hours. Avoiding such use cases the system runs stable without freeze. 1. Start Firefox and call a heavy duty webpage 2. KDE suddenly freezes including the mouse pointer 3. System does not react on anything, but a remote-login via ssh is possible 4. Hard reset needed. OBSERVED RESULT System freezes suddenly. EXPECTED RESULT No freeze like in Debian 11 SOFTWARE/OS VERSIONS Linux/KDE Plasma: Debian 12 (bookworm) stable Kernel 6.1.0-11-amd64 (64-bit) KDE Plasma Version: 5.27.5 KDE Frameworks Version: 5.103.0 Qt Version: 5.15.8 ADDITIONAL INFORMATION Did not occure in previous versions (KDE Plasma Version 5.20.5)
Do you have the plasma-browser-integration plugin enabled in Firefox? If so, can you try disabling it and seeing if that helps?
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(In reply to Nate Graham from comment #1) > Do you have the plasma-browser-integration plugin enabled in Firefox? If so, > can you try disabling it and seeing if that helps? No - this plugin is not installed. As already written this bug is not related to Firefox only. Yesterday KDE freezes within another application, but Firefox did have 100% CPU usage as application in the background. KDE seems always to freeze when using the mouse clicking some action.