Unable to change Refresh Rate

So from the phrasing, this was working before and is no longer working? I see that you're also running an nVidia gpu. What version of the nVidia drivers are you currently running? And also, if you wouldn't mind running a

uname -r

As well, that would be great. If it turns out that you are running the latest kernel (6.8) and version 545 of the nvidia drivers, that would most likely be the case:

EDIT: I know this is specifically a different issue, but these have been the largest culprit of most issues lately regarding these types of deals, so it's a good start

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