ACPI: Embedded Controller [EC0]

I spent a couple of hours last night trying to fix a broken BIOS.
It's a long shot, but do any of you have the specification for ACPI: Embedded Controller [EC0] (gpe 25)?
So far, I think I'm managed to work out (from the ACPI spec and lots of googling):

  • EC0.BMF0, 3 // always == 2
  • EC0.BTY0, 1 // always == 1
  • EC0.BST0, 8 // Battery State Bitfield
  • EC0.BRC0, 16 // Remaining Current (mAh)
  • EC0.BSN0, 16 // Serial Number ???
  • EC0.BPV0, 16 // Present Voltage
  • EC0.BDV0, 16 // Design Voltage ???
  • EC0.BDC0, 16 // Design Capacity ???
  • EC0.BFC0, 16 // Last Full Capacity
  • EC0.GAU0, 8 // Battery Gauge = WTF?

But these may be wrong, and I don't know what Battery Gauge is.
Any helpful links, pointers or other help will be rewarded with a beer at GUADEC2007. :-)


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Richard has over 10 years of experience developing open source software. He is the maintainer of GNOME Software, PackageKit, GNOME Packagekit, GNOME Power Manager, GNOME Color Manager, colord, and UPower and also contributes to many other projects and opensource standards. Richard has three main areas of interest on the free desktop, color management, package management, and power management. Richard graduated a few years ago from the University of Surrey with a Masters in Electronics Engineering. He now works for Red Hat in the desktop group, and also manages a company selling open source calibration equipment. Richard's outside interests include taking photos and eating good food.

One thought on “ACPI: Embedded Controller [EC0]”

  1. I doubt there is one as such. The EC is just an interface to the low-level hardware, and how it's wired up will depend on the specific machine.

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