[Bug 94596] xserver-1.18.2 uses one core fully with dri3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94596

--- Comment #22 from Bernd Steinhauser <linux at bernd-steinhauser.de> ---
As mentioned in bug 94624, I do see this, too.
GPU is Kaveri, driver is radeon. I could try to reproduce it with amdgpu, but I
don't really see the point as it was proven already.

For me, there is no delay in the effect. Immediately after login I do see Xorg
using one core fully.
That made it quite easy to bisect.

I also can remove the effect by reverting said commit on top of 1.18.2.

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