[Wayland-bugs] [Bug 777470] Scale factor too large on wayland backend with tiled monitors

[mutter (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=777470

--- Comment #10 from Dan Doel <dan.doel at gmail.com> ---
Actually, Jonas was correct. I have two identical 4K displays connected. Each
takes one DisplayPort cable as input, and MST streams drive two panels in each.

I reset one of the monitors to DisplayPort 1.1 mode, which renders it unable to
expose the MST tiles, and thus it runs in the 3840x2160 at 30 mode. Hopefully
that's good enough (otherwise I'll have to switch out video cards). I left the
other in DP1.2 mode running at the 60Hz modes. You can see the command outputs
in the "30Hz + 60Hz" files.

Interestingly in this setup, everything is scaled properly on the 30Hz monitor,
but when I drag (Gnome or weston) window to the 60Hz monitor, it suddenly
becomes huge. It will stay huge until I get it back on the 30Hz monitor, and
make it realize it is so (just dragging it there doesn't seem to be enough, but
trying to make it snap to a side is).

And yes, weston-terminal also displays this behavior.

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