I am running Fedora 28 on a ThinkPad T460s. On the first log in, directly after booting, the screen becomes grey with the mouse pointer visible, but I cant move it. It stays like that for a few minutes (seems to be getting longer on average) Previously this happened rarely, but now it reliably happens every time.
Subsequent logins don't take more than a few seconds.
When I wait for 5 minutes between booting and login, the first login doesn't take very long. Less than 2 seconds, I'd estimate.
How can I resolve this problem, where do I start with troubleshooting?