This has been happening since a few months.

I have activated screen locking after 10 minutes without activity.

I use a Lenovo Thinkpad T430 with some privative drivers.

I thought that it was because I installed tlp, but even after uninstalling it, happens.

I've tried the solution from https://elementaryos.stackexchange.com/a/591/11909 But it was useless.

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