[V7] Graphic garbage on secondary monitors when using scaling.

[yozoon]

[V7] Graphic garbage on secondary monitors when using scaling.

[MonsieurLanza]

More tests : Everything is ok when scaling is disabled. But I'd need magnifying glass for my 24" 4K ^^
200% scaling does not solve the problem, (so it's not subpixel scaling)

[yozoon]

Indeed this issue seems to be related to scaling. I tried it out on my system and 125% seems to be the worst option effect-wise, as it somehow influences the backgrounds of monitors which are not scaled at all. Setting the scaling to all other values (150%, 175% and 200%) only seems to have an effect on the scaled display, but leaves the other ones unaffected.

[yozoon]

On my system the blur on the lock screen seems to have the same problem with scaling set to 125% (and the extension being disabled). Does your lock screen look also have blur issues, or does this only happen to the backgrounds when the extension is enabled?

[MonsieurLanza]

Yes, same problem here, but did not notice it, as it is not as anoying as in overview : blurred background is reduced to 1/4 width, 1/4 height on each screen. Seems it is gnome's bug, then… Maybe you could let user choose the blur algorithm, the old one or the new gnome one ?

[yozoon]

@MonsieurLanza does this issue still persist? Just recently I tried to reproduce the issue on my machine, but did not get any graphics artifacts on any scaling level. So it seems to me as if this issue was fixed by the gnome devs :)
I am currently using GNOME version 3.36.3

[MonsieurLanza]

Sorry could not test yet, I got back to X-window for some unrelated reason and could not test until today… But now I have Gnome 3.38 😁