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dcd3527299
We were using a relative target of 0, meaning "complete the flip ASAP". This could result in the flip sometimes, but not always completing in the same vertical blank period where the corresponding drawing occurred, potentially causing judder artifacts with applications updating their window contents synchronized to the display refresh. A good way to test this is the vsynctester.com site in a windowed browser, where the judder results in the large "VSYNC" text intermittently appearing red or cyan instead of the expected gray. To avoid this, use a relative target MSC of 1, meaning that if a vertical blank period is in progress, the flip will only complete in the next one. Reported by Julian Tempel and Brandon Wright in https://bugs.freedesktop.org/106175 . (Ported from amdgpu commit a1b479c7d0066c481af920f297d6af9009dda11e)
xf86-video-ati - ATI/AMD Radeon video driver for the Xorg X server
Patches and questions regarding this software should be directed at the amd-gfx mailing list:
https://lists.freedesktop.org/mailman/listinfo/amd-gfx
Please submit bug reports to the Xorg bugzilla:
https://bugs.freedesktop.org/enter_bug.cgi?product=xorg&component=Driver/Radeon
The master development code repository can be found at:
https://gitlab.freedesktop.org/xorg/driver/xf86-video-ati
For patch submission instructions, see:
https://www.x.org/wiki/Development/Documentation/SubmittingPatches