veyepar: Vampire Mice: How USB PM impacts you

Author(s):	Sarah Sharp
Location	MCC1
Date	jan Wed 30	Days Raw Files
Start	11:35	First Raw Start	error-in-template
Duration	0:45:00	Offset	None
End	12:20	Last Raw End
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http://lca2013.linux.org.au/schedule/30009/view_talk
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Did you know that your innocent USB mouse is actually a power-hungry battery-draining monster?  This talk explores the impact of USB devices on platform power consumption, and introduces some cool new power features in the Intel Ivy Bridge and Haswell USB host controllers.

USB devices have always been battery eaters.  A single active USB device will prevent runtime PM of USB host controllers, keep the CPU in higher C-states, and keep the system out of the new Intel S0i3 sleep states.  This talk will cover tools that can enable USB power management, including the USB power sysfs interface and the USB power options in PowerTop 2.0.  We'll also touch on the horrid little USB devices that break when power management is turned on, and how Linux customers can avoid purchasing them.

We'll also cover some cool new USB power management features that Intel has been stuffing into their Ivy Bridge and Haswell chipsets.  Ivy Bridge includes support for USB 3.0, and the new "Link Power Management" feature that allows individual links in the USB bus to power down.  Haswell includes support for a cool new mechanism to completely turn off USB ports, and a way to place the USB host controller into the deepest PCI power savings state (D3cold).

The aim of this talk is to educate users on how USB devices impact their battery life, and to introduce them to cool power savings on new and future Intel systems.  This talk targets all users, but will provide deep dives into technical details for the more advanced users.

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