It was rc6 that finally fixed the amdgpu bug that's been annoying me for the past two months after I switched to a newer kernel than my distro came with in order to make some stupid ML stuff work. Probably it was the change described as "fix the runtime resume failure issue" I suppose. Whatever the problem was, it's gone now. If your graphical session sometimes fails to come back after the monitors were powered off for a while, 6.8 may be the kernel for you.
That's the problem with going out of your way to get a newer kernel. It has some new features but also some new bug and before you know it you're spending Sunday nights compiling the latest rc builds straight from Linus.