** Also affects: lightdm-gtk-greeter (Ubuntu)
** Changed in: lightdm-gtk-greeter (Ubuntu)
Status: New => Fix Released
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[PATCH] Accessibility partly broken due to X root window being kept
from login session.
Status in LightDM GTK+ Greeter:
Status in lightdm-gtk-greeter package in Ubuntu:
Status in unity-greeter package in Ubuntu:
Lightdm version 1.21.5, in 17.04. Some components of the Unity and
Mate desktops are currently not accessible when logging in using
lightdm. So far I've tested and reproduced this problem with both
unity-greeter, and lightdm-gtk-greeter, so I suspect it is what I
mentioned in the title, i.e the X root window is kept around.
At-spi gets loaded in the greeter for use with Orca. At-spi ads a
property atom, AT_SPI_BUS, to the root X window to allow software to
be able to find the accessibility bus. If my understanding is correct,
this root window is kept around for the user login session. What then
happens is software either using Qt or Gtk loads its accessibility
support code, which in turn looks for the AT_SPI_BUS property.
Normally on session load, this property is not present, at which point
the support code then connects to org.a11y.bus, which in turn via
systemd loads the at-spi bus launcher and registry to respond to the
bus activation/request. At-spi adds the AT_SPI_BUS property to the X
root window at load.
However the AT_SPI_BUS property is hanging around from the greeter
session, which is confusing software. At-spi only then gets loaded
from /etc/xdg/autostart/at-spi-dbus-bus.desktop by the mate or gnome
session binaries, but this happens after unity-panel-service and mate-
panel are loaded. As such they are inaccessible for the session, or
until the user kills them and they get reloaded.
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