[kwin] [Bug 524346] Composited tearing requests fall back to VSync

https://bugs.kde.org/show_bug.cgi?id=524346

--- Comment #1 from [email protected] <[email protected]> ---
UPDATE: it turns out I was wrong about KWIN_DRM_USE_MODIFIERS=0 solving the
problem, even with that the requests are vsynced. I've rebuilt Kwin with a
small patch that supportedAsyncDrmFormats() even for the composited path and
tearing is still not observed. I enabled DRM KMS logging and I can see messages
like:

  [drm:intel_async_flip_check_uapi [i915]]
  [PLANE:64:plane 2A] async flip not supported

So the driver is rejecting the async flips for some reason.

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