Comment 2 for bug 1855220

I tried to re-create this issue on
dell [optiplex] 780 (c2q-q9400, 8gb, amd/ati cedar radeon hd 5000/6000/7350/8350)
Very different card with two displays, flurry was nice and smooth and I could not rec-reate

I then tried hp 8200 elite sff (i5-2400, 8gb, nvidia quadro 600), but I had a different issue (xscreensaver was nice and smooth, no glitches or jerky behavior; it just happened to cover on a single display)

following are notes from QA-test on hp 8200 :-
chosen as this box shares same displays as hp77700 thus identical setup. it also has nvidia though different card

adjust displays to match setup, make 'my-lower' display default & apply & save as i did before
suspend system, wait (what feels like 15 secs but would be far shorter if timed I bet..), this box wakes on ESC key as hp7700, however xscreensaver is smooth, but hiding only TOP display??? grrr.. https://bugs.launchpad.net/ubuntu/+source/xscreensaver/+bug/1814490
wake, load xscreensaver and preview - alas only top screen is hidden (nice smooth flurry) and bottom isn't covered at all..