[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

            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 at lists.freedesktop.org
          Reporter: adf.lists at 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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