I am having the exact same problem, no one seems to know any possible solutions. I am going to try one more thing before I go completely insane, first make sure your monitor has been recognized.
Go to YaST and click Graphics cards and monitors and look if your monitor model is there. If it isn't, then it might be a monitor issue, because when I change the resolution manually, the refresh rate does not match, so the monitor goes black.
Anyways, if you find a solution, please contact me.
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