amd64 kernel uses nx emulation?

according to https://wiki.ubuntu.com/Security/Features#Non-Exec%20Memory amd64 kernel should use real nx or no nx at all. I have nx flag present in /proc/cpuinfo:

morgwai@darkstorm:~$ cat /proc/cpuinfo |grep nx
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 lahf_lm tpr_shadow vnmi flexpriority
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 lahf_lm tpr_shadow vnmi flexpriority

and nx enabled in bios but in /var/log/dmesg I can see

[ 0.000000] Using x86 segment limits to approximate NX protection

Am I missing something?
My system is karmic for amd64 on ThinkPad X200.

Thanks

  Morg