Comment # 4 on bug 98146 from Mike Lothian

Also are you using DRI2 or DRI3?

I saw most of those issues with DRI2 but they went away with DRI3

The tearing won't go away until the fencing work lands in the kernel's i915
driver - radeon should work with this but a few things still need to change for
amdgpu

I find some of these issues sometimes go away by disabling and enabling the
compositor inside the app - in kwin it's Shift + Alt + F12