I'm running Debian 9.1 with KDE and KDE Accessible / the screenreader keeps appearing from time to time for some reason. I'd like to know why that is and how to prevent it from starting.
It's not listed in the autostart entries in Background Services nor in the BootUp-Manager (bum). In the Accessibility Options "Screen reader enabled" is not checked.

ps -ef | grep access gives me:

/usr/bin/dbus-daemon --config-file=/usr/share/defaults/at-spi2/accessibility.conf --nofork --print-address 3

The content of /usr/share/defaults/at-spi2/accessibility.conf can be found here.

  • Maybe you hit the shortkey of it? I think it was meta+alt+s – Ziazis Aug 25 '17 at 7:19
  • I don't hit such uncommon shortcuts by accident. And this is happening on multiple machines. I verified that this is the shortcut of kaccess. Furthermore it's not starting when I hit that combo. I'm referring to that blue tray icon. – mYnDstrEAm Aug 25 '17 at 11:40
  • Well if it is useless to you just purge it? sudo apt-get purge kaccessible – Ziazis Aug 25 '17 at 11:49
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    Yes, but that's not a solution. I'd like to know why it does start automatically because I didn't tell it to do so and that's strange. – mYnDstrEAm Aug 25 '17 at 11:57
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    Related question: unix.stackexchange.com/q/398268/9158 – porton Oct 15 '17 at 19:01

It's a session D-Bus service, defined in file /usr/share/dbus-1/services/org.kde.kaccessible.service. It is started indirectly by systemd's user session manager.

See systemctl --user status.

When a GUI desktop session begins, one of the user-level services started at that time is the accessibility bus service: at-spi-dbus-bus.service. It starts at-spi-bus-launcher, which in turn starts an instance of dbus-daemon for the accessibility bus, and the actual D-Bus services of the accessibility bus, including kaccessibleapp.

In order to disable just the kaccessibleapp service, as far as I can see, the file /usr/share/dbus-1/services/org.kde.kaccessible.service would need to stop existing in that directory; there does not seem to be any other way to control the start-up of that service specifically.

If you want to disable the entire accessibility bus, run systemctl --user stop at-spi-dbus-bus.service as your regular user account, then verify nothing important to you is broken by that. If something is wrong, just logging out and back in restarts the accessibility bus again. To persistently disable the accessibility bus from starting, run systemctl --user disable at-spi-dbus-bus.service. To undo, replace disable with enable.

If some other session-level service requires the accessibility bus in its systemd configuration, the accessibility bus service may still get started to fulfill that requirement. To explicitly forbid the start of the accessibility bus even if something else requires it, run systemctl --user mask at-spi-dbus-bus.service. To undo, replace mask with unmask.

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