Xperia Z, ParanoidAndroid and Undervolting

By | June 4, 2013

So I have had my Xperia Z for awhile now, and have been running a custom rom since day one.

Device: Sony Xperia Z (16GB White)
ROM: ParanoidAndroid PAC
Apps: Kernel Tuner and Stability Test

I used Kernel Tuner to change governor to wheatley, scheduler to row, enable fast charge and undervolt. I have the CPU set from 192Mhz – 1242Mhz. I then ran the following Stability Test’s.

  • Classic Stability Test for 30 minutes.
  • CPU+GPU Stability Test for 20 minutes.
  • Scaling Stability Test for 20 minutes. (192Mhz – 1512Mhz @ 15 seconds per frequency).

There was no freezes or reboots.

As for undervolting, my CPU is a “PVS-3”. Taken from this post you can check what PVS revision your CPU is.

The Qualcomm (S4 Pro) SoC has 4 different variant. Slow, Nominal, Fast and Faster (0, 1, 2, 3) . Faster variants can undervolt a lot lower than the rest, or it should already be pre-configured automatically at a lower voltage like the Nexus 4, so some Xperia Z will have less heat and perform better in battery life. For example, for nominal variants, they might only be able to undervolt around -100mV while faster variants can undervolt around 175mV – 250mV.

Voltages

  • 192000 = 700000 (-75)
  • 384000 = 700000 (-150)
  • 432000 = 700000 (-175)
  • 486000 = 700000 (-175)
  • 540000 = 700000 (-200)
  • 594000 = 700000 (-200)
  • 648000 = 750000 (-175)
  • 702000 = 750000 (-175)
  • 756000 = 750000 (-225)
  • 810000 = 775000 (-200)
  • 864000 = 775000 (-225)
  • 918000 = 775000 (-225)
  • 972000 = 825000 (-200)
  • 1026000 = 825000 (-200)
  • 1080000 = 937500 (-137.5)
  • 1134000 = 937500 (-137.5)
  • 1188000 = 937500 (-162.5)
  • 1242000 = 937500 (-162.5)
  • 1296000 = 950000 (-175)
  • 1350000 = 950000 (-175)
  • 1404000 = 975000 (-162.5)
  • 1458000 = 975000 (-162.5)
  • 1512000 = 987500 (-162.5)

Stock Voltages

  • 192000 = 775000
  • 384000 = 850000
  • 432000 = 875000
  • 486000 = 875000
  • 540000 = 900000
  • 594000 = 900000
  • 648000 = 925000
  • 702000 = 925000
  • 756000 = 975000
  • 810000 = 975000
  • 864000 = 1000000
  • 918000 = 1000000
  • 972000 = 1025000
  • 1026000 = 1025000
  • 1080000 = 1075000
  • 1134000 = 1075000
  • 1188000 = 1100000
  • 1242000 = 1100000
  • 1296000 = 1125000
  • 1350000 = 1125000
  • 1404000 = 1137500
  • 1458000 = 1137500
  • 1512000 = 1150000
  • 1620000 = 1175000
  • 1728000 = 1225000
  • 1836000 = 1275000
  • 1890000 = 1275000
  • 1944000 = 1350000