[Bug 103486] Tonga DC vblank_mode=0 not working as expected fullscreen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103486

--- Comment #2 from Andy Furniss <adf.lists at gmail.com> ---
(In reply to Michel Dänzer from comment #1)
> (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?

I was the version before 11h ago update at time of filing bug,

4ce527eb8bb3c4130f3f6bcd9b4b2efe25fcd534
drm/amdgpu: Remove job->s_entity to avoid keeping reference to stale pointer

I first noticed on the version before that, while testing a different bug but
don't have the head commit available. I've just updated to what is current now
and it's the same. I see loads of warnings at startup, but see these have
already been reported.

7781a8c68a6ad110e0d3e11a38357b599ab04da3
drm/amdgpu: remove extra parameter from amdgpu_ttm_bind() v2

> > 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. :)

Ahh, so it does. I knew auto should = off for me, but it was worth being
explicit.

> > 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.

I'll try, I just didn't want to start if this was already known/expected.

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