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I had this issue with 15.2, so did distro upgrade to 15.3 but the freeze issue is not solved. Mostly happens when i'm using slightly intensive application like steam games or virtual box (sometime happens even when using browsing websites).
A lot of times it freezes completely, sometime it appears to be crawling where the caps lock light might responds after 10-20 seconds, same goes to mouse but never turns to normal state even after couple of minutes.
Kernel 5.3.18-59.19-default
Some forums says it could be due to BTRFS but no conclusion on how to solve it. Please advise.
It could be that your disk space utilization is high enough that the combination of snapshotting and journal archiving are causing heavy background disk I/O at times. Use btrfs filesystem df -h to discover just how much space is really in use. You might try deleting older snapshots, and/or limiting the number of files in /var/log/journal/* to only recents. I use /etc/systemd/journald.conf to limit file count automatically with SystemMaxFiles=, which by default is only a comment.
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