There was an issue about this on the old bugtracker but it's gone now...
GNOME3 bugtracker bug: https://bugzilla.gnome.org/show_bug.cgi?id=741133 (It looks like the LibGDX guys found a workaround for it, so there's that. I'll look at what they did and let you know. EDIT: here: https://github.com/libgdx/libgdx/issues/2475)
(Attached is the screenshot that was on the old bugtracker... It's quite outdated.)