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I was told I should make a bug report.

There was line in the news that said make any bug reports to the 1.8.3 BETA thread,
but that thread is LOCKED.

There is no bug report system to be found.
So, is there any place to send bug reports ?

I think Myrd was suggesting that you send a bug report to those responsible for creating your graphics driver(s), so in this case, that would be whoever wrote your Nouveau and/or Mesa drivers.