Sony :: New Z With Additional SSD/HDD

I found out my cause for shortened battery life

And, as I feared, it is connected to the Lenovo Ultrabay adapter

After careful analysis, I found out the reason - it looks like when the additional drive is connected via DVD SATA port, BIOS does not expose P-states correctly.

What happens then is Windows (or Linux for that matter) cannot scale frequencies down - your CPU will constantly run at the highest frequency!

As soon as I disconnect the additional drive, and run the Windows DDK PwrTest /infopm - I get normal values.

If the additional drive is connected, Windows sees only Throttle states!

This looks like some strange BIOS bug - I cannot possibly see connection between additional drive and CPU, except that something gets corrupted in the ACPI tables.

I am still investigating this, but as it seems right now we will have to choose between long battery life and another HDD/SSD drive.

You can also verify this even without PwrTest tool - just go to Task Manager and then to Resource Monitor, and then to "CPU" tab - if it says "100% maximum frequency" all the time, this means the P-state transitions do not work.