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

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Bug ID 103486
Summary Tonga DC vblank_mode=0 not working as expected fullscreen
Product DRI
Version DRI git
Hardware x86-64 (AMD64)
OS Linux (All)
Status NEW
Severity normal
Priority medium
Component DRM/AMDgpu
Assignee dri-devel@lists.freedesktop.org
Reporter adf.lists@gmail.com

R9285, I notice that on both drm-next-4.15-dc and 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.

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?

It doesn't happen with a months older DC kernel I have and looking at DC
benches on Phoronix I don't see any fps cap.


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