last and lastlog - strange behaviour

[witek]

I have seceral users in my system. They log using gdm into XFCE. When I type command

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 w 

I can see who is logged in.

When I type command

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last

I can see the history of logging

but when I type

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lastlog

it says everybody never logged in. It seems lastlog only remembers logging directly from tty not via gdm. Why is that so? I can remember users logged with kdm under slackware 12 were archieved by lastlog.