modesetting TearFree / VSYNC aware rotation pageflipping

Martin Peres martin.peres at
Thu Oct 4 07:42:38 UTC 2018

On 03/10/2018 17:36, Michel Dänzer wrote:
> On 2018-10-03 4:22 p.m., Carsten Behling wrote:
>>> TearFree uses separate dedicated scanout buffers, to which the "main"
>>> buffer contents are copied on demand.
>>> Originally, these three things (DRI page flipping, rotation and
>>> TearFree) were separate and mutually exclusive. However, the
>>> amdgpu/radeon drivers support all of them the same time these days; this
>>> still requires an extra copy in some cases, but that could be eliminated
>>> at least in the non-rotated DRI page flipping case.
>>> has the
>>> start of TearFree support for the modesetting driver, but it's still
>>> mutually exclusive with rotation (DRI3 page flipping should work with
>>> TearFree, but may still exhibit tearing if the client/user disables
>>> sync-to-vblank).
>> Couldn't we extend modesetting in addition to Martin's TearFree patch the
>> same way you did here for Radeon?:
> Yeah, something like that would be needed.


Would you like to add support for it on top of my branch? I am a bit
swamped but I could be convinced to help you on this if needed :)


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