I’m using Fedora 35 KDE with closed source Nvidia driver for a very obsolete Nvidia card.
When I use Plasma System Monitor, the system often hangs (even ctrl-alt-F3 does nothing, only a hardware reset works). With the current software, I haven’t had any similar problems when NOT running Plasma System Monitor (KSysGuard works fine as a slightly uglier alternative).
When I was using the nouveau driver, I had lots of similar hangs, pretty much any time updates were occurring at the same time both in a visible window and in some other window hidden by that visible one. I don’t know whether there is any connection between those failures and the failure I’m asking about here.
I suspect the ancient Nvidia card is somehow relevant, because it is the only really unusual thing that could explain why I have this problem and most others don’t.
A google search found just a few other mentions of this problem, each of which implied it was much less common on systems where it happens at all than it is on my system. If I leave Plasma System Monitor running while doing ordinary activities, my system will hang within at most a few minutes. Often it hangs just starting Plasma System Monitor.
Is this a symptom of some more serious underlying problem with this computer? Or is it just a bug in that program that somehow isn’t hit by most users?