Nheko is my favourite client, it uses QT and is written in C++, its lightweight and works well on my machines with low resources, it also respects my system theme

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I figure that the administrators of your homeserver could see your IP address, I doubt that it would be sent to anyone you are just chatting with.

Ive only had to setup a nvidia system once, so I might be missing some packages, but I think pacman -Rns nvidia nvidia-utils lib32-nvidia-utils should get rid of all of it.