@Hui, I tried the patched kernel you released and posted on https://bugs.launchpad.net/ubuntu/+source/linux-raspi2/+bug/1852035 . It works fine ( other than the dmesg logs that the other tester posted ) under KDE Plasma and LXQt. It seems that only Mate suffers the flickering and other rendering artifacts. All desktops have accelerated compositing now as expected.
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