Comment # 5 on bug 107082 from Michel Dänzer

(In reply to mikhail.v.gavrilov from comment #4)
> The first that I did not like was that on the first monitor which was
> connected via DisplayPort, the scaling setting was reset from 200% to 100%.

Sounds like a GNOME issue. The kernel driver doesn't do any implicit scaling,
it's all up to userspace.