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I have a dell xps15 9530 with high capacity battery. On Ubuntu 15.10 I was getting 6-8hrs battery life using intel graphics, but on 16.10 I only get around 2 hours. Powertop shows 20-30w power usage while idle.

Is there any way to find what is causing this?

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    Possible duplicate of How do I monitor power consumption?
    – David Foerster
    Aug 7, 2016 at 8:29
  • Just for anyone with a similar issue, I switched to vanilla Ubuntu and the problem was gone. The issue occurs on Ubuntu-Gnome. I switch back to the Ubuntu-Gnome partition every few months and apt-get update, but the problem is still there.
    – mp035
    Apr 21, 2017 at 3:14

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Ok, so after nearly 12 months, I have solved it. The problem was the NFC radio on the dell xps was permanently enabled. In vanilla Ubuntu there does not seem to be a driver, but there is one in Ubuntu Gnome.

Running

rfkill block nfc

reduced the power consumption by around 8 watts on standby.

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  • Ubuntu GNOME and Unity come with exactly the same kernels and drivers. However, GNOME may enable Bluetooth by default while Unity doesn't.
    – David Foerster
    Apr 21, 2017 at 9:54

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