Comment 4 for bug 1855220

I downloading & booted Xubuntu 20.04 daily and played there.
same hp dc7700 (c2d-e6320, 5gb, nvidia quadro nvs 290)
on same box. adding xscreensaver & using 'flurry', I got the same jerky/choppy response here once packages added & running.

I could see the xscreensaver dialog box where I click 'preview' (approx correct position on screen but on wrong display??!!) when it jerked (or I described as black-white-blocky-bad-signal in original post; I'd not use those words now). Yes it's somewhat like a bad signal on tv, but I do get the same response here on Xubuntu 20.04 daily.