Fresh install in Lenovo T420s gets stuck

[Tim <lists@xxxxxxxx>]

I did a fresh installation of centos7 on a Lenovo T420s. But after rebooting the machine after the installation process finished I get messages of CPU got stuck for 22sec. This happens after logging in at gdm. I can't do anything - the machine hangs completely. Switching to tty only works before logging in at gdm.

I really don't have an idea.

My other T420 (without "s") works fine.

Any help is appreciated.

Thanks in advance
Tim
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