Radeon X.Org Driver Gets Fixed Up To Always Allow Page-Flipping With TearFree
Written by Michael Larabel in Radeon on 17 August 2017 at 06:22 AM EDT. 29 Comments
RADEON --
It's fairly rare these days seeing improvements to the xf86-video-ati DDX: the driver for those running a pre-AMDGPU (GCN 1.2) graphics card with this driver paired with Radeon DRM and not using the generic xf86-video-modesetting driver instead. But if you are using xf86-video-ati and use the "TearFree" feature to try to avoid screen tearing, a number of patches landed today.

Michel Dänzer of AMD landed a handful of patches to the xf86-video-ati Git repository today for the Radeon DDX. Notably the patches make for always allowing DRI2 page-flipping to be used with TearFree and the same goes for DRI Present page-flipping with the TearFree option. Long story short, page-flipping should now always work in the TearFree mode.

As a reminder of the TearFree option from the driver's man page, "Set the default value of the per-output 'TearFree' property, which controls tearing prevention using the hardware page flipping mechanism. TearFree is on for any CRTC associated with one or more outputs with TearFree on. Two separate scanout buffers need to be allocated for each CRTC with TearFree on."

The work is available via FreeDesktop.org Git.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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