Random freezes with AMD Ryzen fix for Manjaro

I was having these random freezes, when only hard reboot could revive the system, in Kubuntu and tried googling a lot reading system logs, updated BIOS... Decided to switch to Manjaro hoping that they will go away by itself, but I started haing freezes again especially when I lock screen...

I found these instructions and applied them: https://archived.forum.manjaro.org/t/amd-ryzen-problems-and-fixes/55533

The instructions are very easy to follow, except I could not find the BIOS option mentioned there...

So far, the system is stable and did not freeze yet. There was a minor hiccup on return from locked state, but this time tty2 (ctrl+alt+f2) worked and I ran reboot from there..

I will keep an eye on it though and will update the post.

Updates

• Had a freeze today (same day after I posted this) but not in the lock screen, when working with chrome. (05/11/2021)
• 07/11/2021: Another freeze, I was watching a youtube video.
• 24/11/2021: I finally found C-states and the idle option in BIOS, and after this I have not had any freezes yet...

Remapping keys on kubuntu (Apple aluminum keyboard, Canadian Multilingual/French layout)

I like Apple keyboards, they are very comfortable to work with. But I prefer Linux to Mac, so I just attach my Apple keyboard to my Linux machine and try to make it work.

This time It worked almost out of the box on Kubuntu 21.04, but I had the following two keys swapped: 'ù' and '/'. First, I tried to remap them using xmodmap and xev, and it worked but that messed up my Yakuake shortcut and it continued to reset it after each reboot... I tried to figure out why, but in the process I found this post, which pointed me to this utility Key Mapper (just download and double-click the .deb to install it). From there it is easy to remap the keys (IFF you have sudo rights on your computer):

The only downside of this approach is that you have to have sudo rights to use the program. You could try installing it in an alternative location with

dpkg -x key-mapper*.deb dest/directory/of/your/choice

But, I think it requires root privileges to apply the mapping, which is a bummer. Not sure if this is easy to fix or if it is on the developer's radar.

Kubuntu 20.04 CPU and Network history are not showing up in KSysGuard

When I saw this problem and started googling, the solution that helped others was to copy SystemLoad2.sgrd file from a system folder to

~/.local/share/ksysguard/

, but that did not help me...

But removing the file

~/.local/share/ksysguard/SystemLoad2.sgrd

and restarting KSysGuard solved the issue for me. Therefore this solution is here, hope someone will find it useful as well.