Das Werkstatt

Two things you should avoid when trying to install GNU/Linux or some other Free OS on a Sony Vaio SVS1511L3ES / SVS151A12M :

• change the BIOS boot settings from 'UEFI' to 'Default'

• boot from the the optical drive

Both probably will cause the keyboad to stop working. Sounds weird but: tested a few times.

[Workaround]

• if the keyboard is stuck already there seems to be no other way than booting M$ Windos once again - somehow the keyboard is activated this way - to do so plug in an external usb keyboard

• use EFI / GPT instead of GRUB / MPT

• boot from usb flash drive

Good luck!