CentOS - Dec 2018 - CR repo update disaster for my desktop.

I have a centos 7.5 desktop workstation with dual nvidia graphic cards running
three monitors. I use the i915 motherboard graphics adapter for the third
monitor with bumblebee to work the magic to enable the three contiguous work
spaces.
I use the kmod nvidia drivers for the two graphics cards. This has worked
without a hitch for 5 months until this weekend.
I enabled the CR repo and did the yum update. Some 800+ rpms were offered and
all seemed to resolve depenancies OK, so yes it was started. The updates
completed and all looked good, until the reboot.
Initially the new kernel would boot just fine but the gdm/gnome desktop hung. No
login offered.
Reboot and select previous kernel, great, offered login, but the desktop barely
settles before gnome crashes, and gdm restarts and I get to login afresh.
Eventually I have, removed bumblebee, disabled the on board graphics adapter,
reinstalled gnome multiple times, removed nvidia drivers, blown away my .gnome
and related folders, tried as a new user, (no customizations of the desktop) all
to no avail.
Current situation is under my user account cannot get stable desktop for more
than 10 seconds before it sends segfault error 4 in libc-2.17.so
What do I do now? 
Seems that these big updates need to be applied in sub batches with reboots in
between so that one can back out.
Any ideas appreciated. 
Rob

?Sent from BlueMail ?

Le 03/12/2018 ? 06:25, Rob Kampen a ?crit :
> I enabled the CR repo and did the yum update. Some 800+ rpms were
> offered and all seemed to resolve depenancies OK, so yes it was
> started. The updates completed and all looked good, until the reboot.
> 
I got a similar disaster here. I guess the lesson to be learned is that
CR is nice to have on servers, but don't use it on desktops.

Niki

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> Le 03/12/2018 ? 06:25, Rob Kampen a ?crit :
>> I enabled the CR repo and did the yum update. Some 800+ rpms were
>> offered and all seemed to resolve depenancies OK, so yes it was
>> started. The updates completed and all looked good, until the reboot.
>>
>
> I got a similar disaster here. I guess the lesson to be learned is that
> CR is nice to have on servers, but don't use it on desktops.
My question is what will change with the final release of 7.6? I thought
the CR repo usually holds all updates with the exception of
centos-release, or are there more updates to come? I had the impression
that in the past, the final release brought only cosmetic changes with the
centos-release being updated.

Regards,
Simon