Odd, of kdm was enabled previously, then kdm should still be enabled, what does this say?


systemctl status kdm

I guess it may be too late to check that, re-reading your comment(s), you already enabled lightdm, which in effect, would disable all other display managers (I believe).

When you say " I had both lightdm and kdm installed but both were disabled", how did you check exactly?   
systemctl status lightdm
systemctl status kdm

or some other way?


Another possibility: kdm was enabled, but was crashing or otherwise not starting properly after the upgrade.

(In reply to Rex Dieter from comment #2)
> I guess it may be too late to check that, re-reading your comment(s), you
> already enabled lightdm, which in effect, would disable all other display
> managers (I believe).
> 
> When you say " I had both lightdm and kdm installed but both were disabled",
> how did you check exactly?   
> systemctl status lightdm
> systemctl status kdm
> 
> or some other way?
> 
> 
> Another possibility: kdm was enabled, but was crashing or otherwise not
> starting properly after the upgrade.

When it landed at the text console I did:

systemctl list-unit-files | grep dm

and it showed both kdm and lightdm as disabled.

In my current state:
[root@dgilbert-t530 dgilbert]# systemctl status kdm
● kdm.service - The KDE login manager
   Loaded: loaded (/usr/lib/systemd/system/kdm.service; disabled; vendor preset:
   Active: inactive (dead)

I can go back through the logs with journalctl; since I'm still in my 1st f24 boot (in which I had no display manager):

[root@dgilbert-t530 dgilbert]# journalctl -b 0 -u kdm
-- No entries --

so I don't think it crashed (and I don't see anything in abrt-cli ls from today)

Then -1 I think is the system-upgrade boot:
[root@dgilbert-t530 dgilbert]# journalctl -b -1  -u kdm
-- Logs begin at Mon 2013-12-09 16:12:48 GMT, end at Thu 2016-05-19 15:02:08 BST
May 19 12:02:37 dgilbert-t530 systemd[1]: Stopped The KDE login manager.

In what I think was the last normal boot of f23 I see:
[root@dgilbert-t530 dgilbert]# journalctl -b -2  -u kdm
-- Logs begin at Mon 2013-12-09 16:12:48 GMT, end at Thu 2016-05-19 15:03:10 BST
May 19 10:11:28 dgilbert-t530 systemd[1]: Started The KDE login manager.
May 19 10:11:28 dgilbert-t530 systemd[1]: Starting The KDE login manager...
May 19 10:11:28 dgilbert-t530 kdm[1249]: plymouth is running
May 19 10:11:28 dgilbert-t530 kdm[1249]: plymouth is active on VT 1, reusing for
May 19 10:11:28 dgilbert-t530 kdm[1249]: plymouth should quit after server start
May 19 10:11:29 dgilbert-t530 kdm[1249]: Quitting Plymouth with transition
May 19 10:11:29 dgilbert-t530 kdm[1249]: Is Plymouth still running? no
May 19 11:38:08 dgilbert-t530 kdm[1249]: plymouth is NOT running
May 19 11:38:08 dgilbert-t530 systemd[1]: Stopping The KDE login manager...
May 19 11:38:08 dgilbert-t530 systemd[1]: Stopped The KDE login manager.

Strange, I've no idea how kdm service could have gotten disabled in the upgrade process.  It certainly is not intended.

I'll triage this to kde-workspace (owner of kdm) for now, pending further investigation.

Proposed as a Freeze Exception for 24-final by Fedora user rdieter using the blocker tracking app because:

 Folks using kdm and upgrading to f24 currently end up with kdm being disabled.  I *think* I know the cause, and if I'm right, the fix will need a freeze-exception to be included in GA release (an update can't fix it)

adjusting summary to match symptoms

Had same problem after upgrade on two systems. However, I was running KDE with SDDM. Fixed with "systemctl enable sddm.service" and a reboot. So whatever the problem is with upgrade procedure, it is the same with kdm and sddm.

+1
No KDM after upgrading to Fedora 24.

This may be somehow caused by https://bugzilla.redhat.com/show_bug.cgi?id=1349664 , though on a quick look, the sddm spec file uses %systemd_post , which should result in this:

if [ $1 -eq 1 ] ; then 
        # Initial installation 
        systemctl --no-reload preset sddm.service >/dev/null 2>&1 || : 
fi 

so it shouldn't run on an upgrade...

*** Bug 1349855 has been marked as a duplicate of this bug. ***

rex: i'm not really convinced this *is* caused by 1349664, at least not yet, I don't entirely see how it could be, unless you know of something else that would re-load the preset on upgrade.

OK, my only other theory is that the problem here is because the package providing kdm.service changed

f23: kde-settings-kdm
f24: kdm-settings

and on upgrade (with Obsoletes) the %postun scriptlet from kde-settings-kdm (effectively) disables it.

This may be fixable with a %trigger, I'll try to investigate more soon.

I also saw the same behavior on the two machines I upgrade (one from F23, the other directly from F22). Like the original report, I upgraded via dnf system-upgrade. Unlike the original report, kdm was the only display manager I have installed.

Just ran into this right now after upgrading from F23 to F24.

*** Bug 1403730 has been marked as a duplicate of this bug. ***

I have the same problem when switching from fedora 23 to fedora 24.
The GUI is not working.
kdm service was in the status of disabled.

I turn it on command
systemctl enable kdm
Problem solved.

I assume that the script is not finished with the update.

===== RUS ========================================================
У меня такая же проблема при переходе с fedora 23 до fedora 24.
GUI не работал.
kdm сервис был в статусе отключен.

Я его включил командой
systemctl enable kdm
Проблема решена.

Предполагаю что не доработан скрипт при обновление.

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