LightDM - Oct 2015 - Trying to install LightDM 1.16.3 on RHEL 7.0

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Are you running LightDM as a user? It has to run as root. Normally it is
started as a service (i.e. by systemd).

On Tue, 6 Oct 2015 at 06:31 Lutz Christoph <
lchristoph at extern.creativedata.de> wrote:
> Hi!
>
>
> It was no problem to configure/make/make install LightDM 1.16.3. But
I'm
> struggling to get it running. I've snarfed the systemd service
definition
> from the 1.6 RPMs I found, and that works. But lightdm exists after writing
> this to STDERR (it appears in /var/log/messages, fortunately):
>
>
> Failed to use bus name org.freedesktop.DisplayManager, do you have
> appropriate permissions?
>
>
> I tried strace-ing, but are only some binary messages being exchanged
> before this, and I have no idea how to tackle this. I.e. I have not the
> faintest about DBus.
>
>
> Any ideas or hints how to proceed?
>
> Mit freundlichen Grüßen / Kind regards
>
> *Lupe Christoph*
> im Auftrag von / on behalf of
> *Creative Data AG*
> - Standort Süddeutschland -
> Otto-Lilienthal-Str. 36
> D-71034 Böblingen
>
> Mobil:    +49 (0) 172 630 1004
> E-Mail:   lchristoph at extern.creativedata.de
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>
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>
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Not that it answers your direct question, but have you considered trying 
lightdm-1.10.5 (lts branch) from epel7 ?  It should 'just work'.

-- Rex