KDE Plasma 5 sometimes freezes

[EugeneTheJeep]

At least I think it's KDE. The only thing I can do is power off and power back on when it happens.

The mouse cursor freezes and mouse buttons + keyboard shortcuts quit working

I've noticed a pattern of it happening under these three conditions:

1. When closing the Android emulator (qemu based) while using Android Studio

2. When running JavaFX applications under IntelliJ IDEA.

3. When quickly accessing the taskbar, such as switching between already running applications, or quickly navigating through the start menu to open a new application (sometimes even when there are no applications open after a fresh boot, but this is much rarer)

It could be happening under other conditions and I just haven't identified it. I'm not even really sure if it's KDE; it could be X, vid card drivers, or even hardware for all I know

The only other thing I've noticed is that if there is something running on a separate thread like a video or music, it will continue playing, although its performance will sometimes degrade. But it makes me wonder if it's the UI thread locking up.

Here is emerge --info in case it is somehow relevant:

[asturm]

If this is a fatal freeze, I would first and foremost assume the issue with the driver.

[Hu]

If music continues to play correctly, that suggests the system has not panicked. In turn, that says you should be able to ssh in and perform a graceful shutdown (at least, graceful with regard to filesystem remounts - your X session may be irrecoverably broken if a graphics driver has failed). If you have ACPI enabled, you could also use ACPI soft-off to trigger a shutdown.

I see that you have VIDEO_CARDS="nvidia" in your emerge --info. Can you reproduce this problem on an untainted kernel?

[EugeneTheJeep]

[Hu]

Holding the power button for an extended period requests the firmware to hard kill the system. That is not a soft-off, and should be done only as a last resort. A soft-off would be to press the button for a duration similar to when you turn the machine on. If properly configured, it will then run its normal shutdown process, stopping services, unmounting filesystems, and so on.

[EugeneTheJeep]

Correction, I had ACPI enabled in the kernel, but did not have acpid on the default runlevel. I added it and will attempt a soft-off on the next lockup.

[BobWya]

[davidm]

I rarely get freezes or any problems unless I hit some strange corner case. One I notice now occurring is if I have a image slideshow for my wallpaper on one of my activities. This seems to correlate to some strange lockup situation where I lose the keyboard and mouse input after some time of non-use. Possibly 100% cpu use. I should look into this further and see if there is a bug report and try to isolate it more.

But what you might want to do is streamline things a bit and turn off any weird features or non default option temporarily and see if it still does it. Try to isolate it down to some corner case. It took me a long time to realize my issue was related to the slideshow desktop background.

[dmpogo]

I have seen (last time 20 min ago) the #3 from your list. Menu remained opened and frozen, as well as some notifications from task bar.
It came back to life 10 min later. (Konsole was still working, so I was doing some work)

[noremac]

I've also got problems with Plasma freezing randomly. I've switched from nvidia drivers to neavou, but it still hangs (about once every two days). I've not been able to track down what triggers it. I can ssh into the machine ok and do a reboot. What log files should I be looking at to pinpoint the error?
_________________
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[Section_8]

I also get occasional desktop freezes (plasma 5 and nvidia). They are pretty rare (maybe once a week) and I haven't been able to correlate them to anything specific. The mouse cursor functions, but everything else is frozen. I can always just CTL-ALT-F1 to a vterm and restart xdm. Sometimes CTL-ALT-DEL will open the sddm restart screen and I can just logoff and back on.

[Tolstoi]

On my laptop mouse and keyboard freeze quite frequently that it's really annoying meanwhile because it occurs nearly every two days. I have to use the power button to shut down because the keyboard doesn't work.

[tranquilcool]