Patch for Sony Vaio with AMI aptio BIOS
I successfully followed the procedure described on this blog : http://vaioubuntu.wordpress.com/2009/03/26/vt-xvmx-virtualization-patch-for-sony-vaio-fw/
The automatic patch has been written by Igor Levicki, it only works with AMI Aptio BIOS.
Worked on my Sony Vaio VGN-SR19XN which is now happily running virtual machines using VT instructions on an ubuntu host.