I’m on the video-nvidia driver since the last update and uninstalled the other nvidia drivers. Just noticed that my old .conf file was generated for my older monitor setup, so I generated a new file from nvidia-settings, saved it as nvidia.conf and ran sudo mhwd-gpu --setmod nvidia --setxorg /etc/X11/mhwd.d/nvidia.conf (according to a Manjaro wiki article). I restarted the computer and tried a suspend afterwards, but that didn’t help.
Also, I just noticed that my PowerMizer setting (preferred mode: auto/adaptive/maximum performance) keeps reverting to auto whenever I restart, despite saving the configuration to ~/.nvidia-settings-rc. It seems to be a known, and probably another unresolved issue, discussed here:
But that seems to be an issue for another topic.