I'd like to know this too! 

I use DWM and as a workaround I use slock to manually lock the screen 
http://tools.suckless.org/slock/ 
However I haven't gotten it to work with sssd (or passwords not stored in 
normal local unix storage). 
I don't think this would work on a larger scale though. 

// Johan 

> From: "Michael Rainey (Contractor)" <michael.rainey....@nrlssc.navy.mil>
> To: scientific-linux-us...@fnal.gov
> Sent: Monday, April 25, 2016 10:59:25 PM
> Subject: GDM with alternative desktop environments.

> Greeting Community

> I currently have several workstations running SL7.2 and have users running
> different desktop environments. (i. e. GNOME-Shell, XFCE, and KDE). When a 
> user
> chooses to use XFCE or KDE we are forced to additional applications such as
> xscreensaver to lock the screen. Since we are also implementing smart card
> access on our systems along with using IPA for authentication, it has become
> evident will need GDM's lock screen feature. Is there a way to call the GDM
> lock screen from within XFCE or KDE?

> I have found one recommended solution using the dbus-launch command, but it 
> does
> not work because it looking for a ScreenLock object which does not exist.

> Any suggestions or solutions you may have will be greatly appreciated.

> Thanks in advance.
> --
> Michael Rainey

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