I have the same issue. See #370382 and https://bugs.freedesktop.org/show_bug.cgi?id=7112
I discovered that the problem is in acceleration.
Workaround is to disable acceleration :(
Section "Device"
Identifier "s3_trio64v2"
Driver "s3"
Option "noaccel"
^^^^^^ ^^^^^^^^^
Option "DPMS"
EndSection
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