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

[gtk+ (GNOME Bugzilla)]

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

            Bug ID: 777470
           Summary: Scale factor too large on wayland backend with tiled
                    monitors
    Classification: Platform
           Product: gtk+
           Version: 3.22.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: Backend: Wayland
          Assignee: gtk-bugs at gtk.org
          Reporter: dan.doel at gmail.com
        QA Contact: gtk-bugs at gtk.org
                CC: rob at robster.org.uk, wayland-bugs at lists.freedesktop.org
     GNOME version: ---

I run Gnome on a tiled 4K display (meaning the monitor presents two 1920x2160
displays that are combined into an overall 3840x2160 display). When updating to
Fedora 25, I was finally able to run wayland in this configuration. However,
when doing so, the windows (and cursor) are scaled much too large. In X I use a
scale factor of 2x, but the wayland scaling appears to be at least 8x, possibly
more.

This is only an issue with tiled displays. I can also run my monitor as a
single 3840x2160 at 30Hz panel, and the scaling is normal there. Further, I have a
3840x2160 at 60Hz laptop that works as a single panel, and it acts normally.

Hopefully I'm filing this against the right product. Other bugs of this sort
seem to be filed against gtk's wayland backend, and I guess that's where the
scaling information is calculated? As I recall, changing the scale factors in
the tweak tool (which determines how things behave in X) has no effect when
this is happening, so I guess the wayland backed ignores that setting.

I'm running Gnome 3.22 (gtk+ 3.22.6). Let me know if any further information is
needed.

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