https://bugs.freedesktop.org/show_bug.cgi?id=103486
--- Comment #1 from Michel Dänzer <mic...@daenzer.net> ---
(In reply to Andy Furniss from comment #0)
> R9285, I notice that on both drm-next-4.15-dc and amd-staging-drm-next,
Which commit exactly of amd-staging-drm-next?
> when using DC, vblank_mode=0 works windowed but not properly full screen.
>
> Tried forcing TearFree from auto to off no difference.
That's expected; forcing TearFree on works around the problem though. :)
> There is no tearing where it would be expected - but it's not like it's just
> being ignored, a bench mark test will cap fps at 2X refresh rate rather than
> 1X.
>
> Maybe this is expected?
Definitely not, looks like there's been a regression affecting async flips.
> It doesn't happen with a months older DC kernel I have [...]
Can you try bisecting? Otherwise I'll try next week.
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