Does X screen saver invoke any hardware detection?

[Steve Holmes]

Since kernel 5.4.0-40 and xorg-server (pkg: xserver-xorg-core) 
2:1.20.8-2ubuntu2.1 I find AMD SOC Radeon LTSP clients boot to a fuzzy 
(but readable) LightDM, and if I login, the desktop and everything else 
in Xubuntu is blurry/fuzzy and stays that way.

But if I leave LightDM to timeout to a blank screen (the default X 
screensaver 10 minutes) then move the mouse, LightDM is now sharp and 
logging in to Xfce all remains sharp.

Does X screensaver do any extra or different hardware detection?


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