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[Discuss] runlevel 5 service cannot connect to display

The issue (generalizing) is that the Display Manager (GDM) owns the
keyboard, mouse and the display. Your process would need to be a client
of the display manager or X server.
One possible way is to set up a client in /etc/X11/xinit/Xclients.d or
in ~/Xclients. You could figure out a way to communicate between your
service and your xclient, possibly by a named pipe.

On 01/30/2013 04:37 PM, William Chan wrote:
> Actually, the service is just a JMS consumer, it doesn't require UI. When
> it receive a message, it calls an external application which needs X11.
> There is actually nothing shows on display.
> On 1/30/13 4:26 PM, "Rich Pieri" <richard.pieri at> wrote:
>> On Wed, 30 Jan 2013 13:05:03 -0800
>> William Chan <wichan at> wrote:
>> ~./Xclients
>>> I have my service  #chkconfig 5 99 37 since my service needs x11
>> If it requires X11 then it isn't a service. It's an X11 application. It
>> will never run as a service as long as it requires an active X11 server.
>> I suggest separating the service from the UI. This way you can run the
>> service as a service and the UI as a UI.

Jerry Feldman <gaf at>
Boston Linux and Unix
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