where does white text on black screen get logged?

[TomRoche]

I'm having some different problems on different LMDE boxes that share one aspect: they both involve screen messages that occur either before the box enters X or after the box leaves X, when the OS is in character-mode, printing white text on a black screen. To debug those problems, I'd like to retrieve those messages. I'm wondering, to what file(s) are they logged? (And what's the correct, non-newbie way to describe the OS when it's writing white text to black screen ?-)

[äxl]

You can find several logs in /var/log/
Important ones are kern.log (every start), dmesg (this start) and debug