I’m on Solus Plasma. It’s worth noting that this never happened on Solus GNOME which I was driving for a few months before switching to KDE.
So this doesn’t happen every time I shut down, but it’s pretty frequent. What usually happens is I initiate shutdown (using either KRunner or from Application menu clicking shutdown). The monitor and keyboard and mouse switch off, but the CPU does not. Fans are running, RGB is on. I can’t wake it up with any keys. I can only long press power button on the cabinet to force shutdown.
Couple of things I observed:
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I noticed sometimes my external HDD was not auto mounting when I started the PC, so I thought maybe it was automount that was preventing shut down also. So I tried to see if the times automount didn’t work, coincided with the times I had to force shutdown - they don’t. Even if it shuts down without issues I sometimes notice automount not working. And not every time I force shutdown I have automount issues.
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I thought maybe clicking the shut down immediately button on the confirmation screen is what is causing the issue. I tried letting it shutdown on its own after the 10s countdown, but that also yielded inconsistent results.
I’m at a loss for what to do now.
I don’t think this is just a KDE issue as I’m having it on gnome too. Not sure how to fix. I feel like it happens less when I close all background processes before shutting down but idk.
It might be due to display drivers not playing nice on wayland; I’ve had this problem a couple months ago on arch with the amdgpu drivers, using either one of sway, labwc, or KDE. It did not happen on Xfce, though; and after a kernel update the problem subsided.