Connecting my second monitor causes my desktop to crash

[petrus]

Connecting my second monitor causes my desktop to crash (KDE Wayland, nvidia 1660 TI).
If I set nvidia only in optimus-manager (i typically use hybrid) connecting the monitor sometimes works, sometimes still causes a crash. I had no problems with either mode before the update.
Does anybody have suggestion what to do? (I tried to boot using Kernel 5.15 and 5.10)

Downgrading the nvidia driver from 495 to the 470 series did not resolve the problem, same behavior as before

After removing and installing the proprietary nvidia driver several times, for some reason connecting the monitor works now (driver 495.46). … …

[andreas85]

Increase your chances of solving your issue:

[HowTo] Increase your chances of solving your issue

Difficulty: ★☆☆☆☆ Strong of its many members, the Manjaro support forum can provide you help whenever you have an issue with your Manjaro installation. But in order to work efficiently, we shall also ask you to commit to a few things. Keep calm and read First some basics: whenever you need to troubleshoot, chances are the solution is already under your nose. Find error messages Very often when an applications crashes, and sometimes when it misbehaves, it prints an error message somewhere. …

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Welcome to Manjaro! To allow all of us helpful people on this forum TO HELP YOU, we need some basic information about your system. This probably means you described the symptoms of your problem, but now we need some more information to know where the origin of your issue is exactly. Someone else probably linked you to this tutorial, so if you’re reading this in response to a question, please click the link above this text to bring you to the full and unabridged text of the tutorial…

[andreasnielsen]

The needed wattage of the GPU is what matters, not the number of monitors.

The crash resulted in the error. It was as if the computer had been unplugged.

For the time being, I’ll put the PSU away…

In any case, if the RX580 causes your computer to crash while the Quadro p400 does not, the RX580 is at blame.

Is it possible for you to instal the RX580 on a different computer to see if the problem is related to the RX580?