Nothing wrong, i had a look on dmesg and Xorg.0.log !
i'm always keeping an eye on Slackware-current changelog, but they mention nothing about this, also they didn't make any change related to Xserver since i download the current and install it, so if i do now i guess i'll have the same problem, i don't know if there is a bugzilla or anything we can send it to slackware packagers ( i don't like to say developers since all what they do between two release is to compile new versions pack them and that's it.
I strongly believe because they compile the X server without hotplug support,
ftp://ftp.slackware.com/pub/slackwar.../ChangeLog.txt
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For Xfce users with Laptop check
this