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For a while my system boots until x and kdm should start but then it shows the normal console login prompt on tty1 - which is supposed to be the tty for X. Loging in there and then give the 'startx' command starts KDE normally.
Tonight there were some updates involving systemd and related libraries, so I thought it would help but it got worse:

1. Found out the reason for KDM not starting:
In the log on tty12 I see

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kdm_config: Multiple occurences of key 'AllowShutdown' in section [X-:*-Core] of /usr/share/config/kdm/kdmrc
kdm_config: Invalid boolean value '' at /usr/share/config/kdm/kdmrc:495
***** this last line is repreated 3 times with different line numbers of kdmrc ****
kdm: Unknown session exit code (sig 6) from manager process

which makes me think that something is wrong in kdmrc and kdm does not start, so it does not show the GUI but the text login.

2. System start hangs for almost 2 minutes at a step (don't know where) exactly, then goes on. No error message in syslog or dmesg which tells something. No 2 minutes break showing in syslog during system start.

3. Dozens of messages from udisks-daemon during system start like

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**** ADDING /sys/devices/virtual/block/ram0
**** IGNORING ADD /sys/devices/virtual/block/ram0
 - - -This goes on for dozens of devices - - -

Haven't seen this before.

At the moment it looks like the system adds more construction sites with each update while existing problems also stay unfixed.

Next boot:
As mentioned in my previous post system hangs a for almost 3 minutes during system start - now I see it hangs after the line "Looking for new hardware" (I did not add new hardware. system normally did not hang there longer than 10 seconds).

As for the kdmrc errors:
I see the kdmrc errors as in my previous post but additionally:

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kdm: : IO Error in XOpenDisplay(:0)
kdm: Display :0 cannot be opened
kdm: Unable to fire up local display :0; disabling

As I said, more errors.

Going back to tty1 I give my login, write startx and the KDE desktop comes up.

PS: Forgot to say that the system does not shutdown (as described in viewtopic.php?f=15&t=1783 )

Next findings:
Booting in safe mode (single user mode) makes no difference - it boots the same system as normal (including the attempt to start kdm) and ends up at a normal login prompt, not the single mode prompt.

Bug report on all this: https://bugs.mageia.org/show_bug.cgi?id=4197

wobo wrote:Next boot:
now I see it hangs after the line "Looking for new hardware" (I did not add new hardware. system normally did not hang there longer than 10 seconds).

i can confirm this, i have not added any hardware and it hangs at checking for new hardware