jones_supa writes: One of the reasons why someone might have a laptop to be able to do things like use it on battery, and power consumption is an important part of that. Intel Skylake CPU architecture continues the trend from Haswell of moving to an System on Chip -type model where clock and power domains are shared between components that were previously entirely independent. This means that the system cannot enter deep power saving states unless multiple components all have the correct power management configuration. Well, on Linux they do not, finds out Matthew Garrett. The deepest power saving state he can get into is PC3, despite Skylake supporting PC8. Because of this, he estimates using about 40% more power than should be necessary. Nobody seems to know what needs to be done to fix this, and public documentation on the power management dependencies on Skylake is missing.