this post was submitted on 03 Aug 2023
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Sounds like a driver problem. What kernel are you using, and have you tried running Mesa-git?
You can't find any errors because there are none. The brightness changing with the refresh rate is sadly how most monitors work today, and can't really be fixed. It's the whole reason for why adaptive sync is not set to always by default.
Why doesn't automatic work for you though?
You have a fairly recent piece of graphics hardware. It's not too surprising that it doesn't work super smoothly. This is often the case. Even with Intel who've had a long open source driver tradition, a new integrated GPU often has driver bugs. I know I had to turn off a few things on my 11th gen Intel GPU for a year and a bit until the bugs got squashed. To avoid any of this, I rarely buy bleeding edge hardware.
I'm not messing with the kernal at this point, just using whatever gets installed by default. I haven't looked at Mesa-git. If messing about with the kernel is required I might just wait until wayland and kde have matured enough to support adaptive sync and multi monitors better.
I also tried "auto" which seemed to be ok for a few seconds but then behaved the same as always. I can live without it for desktop stuff, my concern is adaptive sync won't be on in games without enabling that settings.