[Bug 99418] DRI3 Stuttering while scrolling in Chromium/Chrome with VBLANK off

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99418

            Bug ID: 99418
           Summary: DRI3 Stuttering while scrolling in Chromium/Chrome
                    with VBLANK off
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: lei.pero at gmail.com

Not sure where to report this issue, as title says, problem is not present with
VBLANK enabled.

Vblank is disabled in both xorg configuration and .drirc profile (and clutter
when using GNOME).

Expected behaviour (DRI2):
When scrolling pages (with smooth scroll) in Chromium for example, it defaults
at FPS=refresh rate (my case 85Hz), there is just tearline present, everything
else is smooth and fine (as with vblank enabled, except tearline).

On DRI3 however, even on simple forums/text based pages, there is
stuttering/choppy scrolling.

GPU is HD 6770, Xorg server version is 1.19.1, if you need more
information/testing, would be happy to do it.

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