There seems to be an issue with the new Nvidia driver (7.15.11.6375) in step 7a. When the laptop resumes from suspend it goes to a BSOD.
Resume works OK with the newest Sony driver (7.15.10.9735) in step 4.
Testing with other drivers downloaded from
here to see which one is more stable.
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Problem solved by downgrading to the latest WHQL certified driver. Guide updated.