I'm wondering why under Gentoo the file /var/log/Xorg.0.log prints our that line for x11-base/xorg-server-1.3.0.0 whereas for x11-base/xorg-server-1.2.0-r3 I got "Linux 2.6.20-gentoo-r8 i686" or similar.
Somehow the setting of this in the configure script got lost - for our 1.3 builds, I found passing --with-os-name="`uname -srmv`" to configure filled it in again. configure has been fixed to use `uname -srm` instead of "UNKNOWN" in configure.ac when --with-os-name isn't specified in git master (including the 1.4 release) so I'm marking this fixed.
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