Wife got a "new" (refurbished) laptop. Thinkpad x280. CMOS battery seems to be dead, and that seems to be creating tons of weird effects. Replacement battery ordered.
@cybersecdancer We got it locally in Greece from an online shop called reuse-it. They confirmed over the phone that the variant they have has a 1080p screen, my wife doesn't want any less than that.
(The SSD and main battery are easily replaced, and we've already verified that all the hardware seems to work out of the box with Linux).