Reportedly this needs the module-sony keymap, not the -old one.
https://launchpad.net/bugs/613578
ENV{DMI_VENDOR}=="Sony*", KERNELS=="input*", ATTRS{name}=="Sony Vaio Keys", RUN+="keymap $name module-sony"
# Older Vaios have some different keys
-ENV{DMI_VENDOR}=="Sony*", ATTR{[dmi/id]product_name}=="*PCG-C1*|*PCG-K25*|*PCG-F1*|*PCG-F2*|*PCG-F3*|*PCG-F4*|*PCG-F5*|*PCG-F6*|*PCG-FX*|*PCG-FRV*|*PCG-GR*|*PCG-TR*|*PCG-NV*|*PCG-Z*|*VGN-S360*|*VGN-SZ2HP_B*", ATTRS{name}=="Sony Vaio Keys", RUN+="keymap $name module-sony-old"
+ENV{DMI_VENDOR}=="Sony*", ATTR{[dmi/id]product_name}=="*PCG-C1*|*PCG-K25*|*PCG-F1*|*PCG-F2*|*PCG-F3*|*PCG-F4*|*PCG-F5*|*PCG-F6*|*PCG-FX*|*PCG-FRV*|*PCG-GR*|*PCG-TR*|*PCG-NV*|*PCG-Z*|*VGN-S360*", ATTRS{name}=="Sony Vaio Keys", RUN+="keymap $name module-sony-old"
#
# The following rules belong to standard i8042 AT keyboard with high key codes.