You are right. The problem was i used vim (like in opensuse) instead a vi as 
command.

Hereafter the file :

QUOTE

UserList=true

[X-:*-Core]
AllowNullPasswd=true
AllowShutdown=All
NoPassEnable=false
NoPassUsers=
ServerArgsLocal=-deferglyphs 16 -nolisten tcp
ServerCmd=/usr/bin/X -br
TerminateServer=false

[X-:*-Greeter]
AllowClose=true
DefaultUser=xxxx
FocusPasswd=true
LoginMode=DefaultLocal
PreselectUser=Previous
UseSAK=false

[X-:0-Core]
AutoLoginAgain=false
AutoLoginDelay=0
AutoLoginEnable=false
AutoLoginLocked=false
AutoLoginUser=hussaile
ClientLogFile=.xsession-errors

[Xdmcp]
Enable=false
Willing=/etc/trinity/tdm/Xwilling

UNQUOTE

how do I add users, for example yyyy and zzzz ?

On Monday 26 August 2019 19:52:43 deloptes wrote:
> mb850063@... wrote:
> > I don't have a /etc/trinity/tdm/tdmrc file (debian stretch).
>
> This is really strange
>
> Stretch here and $ dpkg -S /etc/trinity/tdm/tdmrc
> tdm-trinity: /etc/trinity/tdm/tdmrc
>
> and the usable content
>
> $ grep -v '^#' /etc/trinity/tdm/tdmrc
>
> [General]
> ConfigVersion=2.3
> StaticServers=:0
> ReserveServers=:1,:2,:3
> ServerVTs=-7
> ConsoleTTYs=tty1,tty2,tty3,tty4,tty5,tty6
> PidFile=/var/run/tdm.pid
>
> [Xdmcp]
> Enable=false
> Willing=/etc/trinity/tdm/Xwilling
>
> [Shutdown]
>
>
> [X-*-Core]
> Setup=/etc/trinity/tdm/Xsetup
> Startup=/etc/trinity/tdm/Xstartup
> Reset=/etc/trinity/tdm/Xreset
> Session=/etc/trinity/tdm/Xsession
> AllowRootLogin=false
> AllowNullPasswd=false
> AllowShutdown=Root
> SessionsDirs=/usr/share/xsessions,/var/lib/menu-xdg/xsessions,/opt/trinity/
>share/apps/tdm/sessions ClientLogFile=.xsession-errors-%s
>
> [X-*-Greeter]
> LogoArea=None
> LogoPixmap=/opt/trinity/share/apps/tdm/pics/tdelogo.png
> AntiAliasing=true
> MinShowUID=1000
> MaxShowUID=29999
> Preloader=/opt/trinity/bin/preloadkde
> Theme=@@@ToBeReplacedByDesktopBase@@@
>
> [X-:*-Core]
> ServerCmd=/usr/bin/X -br
> ServerArgsLocal=-deferglyphs 16 -nolisten tcp
> AllowNullPasswd=true
> AllowShutdown=All
>
> [X-:*-Greeter]
> PreselectUser=Previous
> FocusPasswd=true
> LoginMode=DefaultLocal
> AllowClose=true
>
> [X-:0-Core]
> ClientLogFile=.xsession-errors
>
> [X-:0-Greeter]
>
>
> look in
>
>
> [X-*-Greeter]
> ...
> MinShowUID=1000
> MaxShowUID=29999
>
>
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