Comment 2 for bug 1907922

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Jonathan Gutow (gutow) wrote :

A little more information that may help:

1) Same issue seen with a complete new install of ubuntu-server-20.04 for pi 4 + Lubuntu.
2) If I do not include `dtoverlay=vc4-fkms-v3d` in \boot\firmware\usercfg.txt the lag goes away. However this introduces random screen flashing and other screen update artifacts such as blank regions.