Documentation/hwmon/ibmaem

   1 Kernel driver ibmaem
   2 ======================
   3
   4 Supported systems:
   5   * Any recent IBM System X server with Active Energy Manager support.
   6     This includes the x3350, x3550, x3650, x3655, x3755, x3850 M2,
   7     x3950 M2, and certain HS2x/LS2x/QS2x blades.  The IPMI host interface
   8     driver ("ipmi-si") needs to be loaded for this driver to do anything.
   9     Prefix: 'ibmaem'
  10     Datasheet: Not available
  11
  12 Author: Darrick J. Wong
  13
  14 Description
  15 -----------
  16
  17 This driver implements sensor reading support for the energy and power
  18 meters available on various IBM System X hardware through the BMC.  All
  19 sensor banks will be exported as platform devices; this driver can talk
  20 to both v1 and v2 interfaces.  This driver is completely separate from the
  21 older ibmpex driver.
  22
  23 The v1 AEM interface has a simple set of features to monitor energy use.
  24 There is a register that displays an estimate of raw energy consumption
  25 since the last BMC reset, and a power sensor that returns average power
  26 use over a configurable interval.
  27
  28 The v2 AEM interface is a bit more sophisticated, being able to present
  29 a wider range of energy and power use registers, the power cap as
  30 set by the AEM software, and temperature sensors.
  31
  32 Special Features
  33 ----------------
  34
  35 The "power_cap" value displays the current system power cap, as set by
  36 the Active Energy Manager software.  Setting the power cap from the host
  37 is not currently supported.