Difference between revisions of "Power Management"

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[[Image:home.png|link=http://wiki.pcbsd.org/index.php/PC-BSD_Users_Handbook|center|Return to Table of Contents]] [[Image:previous1.png|left|link=http://wiki.pcbsd.org/index.php/Printer_Troubleshooting|Previous: Printer Troubleshooting]] [[Image:next1.png|right|link=http://wiki.pcbsd.org/index.php/ACPI|Next: ACPI]]
  
  
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[[File:Power5.png]]
 
[[File:Power5.png]]
 
man 4 acpi
 
 
hw.acpi.acline
 
    AC line state (1 means online, 0 means on battery power).
 
 
hw.acpi.lid_switch_state
 
    Suspend state (S1-S5) to enter when the lid switch (i.e., a note-
 
    book screen) is closed.  Default is ``NONE'' (do nothing).
 
 
    hw.acpi.power_button_state
 
    Suspend state (S1-S5) to enter when the power button is pressed.
 
    Default is S5 (power-off nicely).
 
 
hw.acpi.s4bios
 
    Indicate whether the system supports S4BIOS.  This means that the
 
    BIOS can handle all the functions of suspending the system to
 
    disk.  Otherwise, the OS is responsible for suspending to disk
 
    (S4OS).  Most current systems do not support S4BIOS.
 
 
hw.acpi.sleep_button_state
 
    Suspend state (S1-S5) to enter when the sleep button is pressed.
 
    This is usually a special function button on the keyboard.
 
    Default is S3 (suspend-to-RAM).
 
 
    hw.acpi.sleep_delay
 
    Wait this number of seconds between preparing the system to sus-
 
    pend and actually entering the suspend state.  Default is 1 sec-
 
    ond.
 
 
    hw.acpi.supported_sleep_state
 
    Suspend states (S1-S5) supported by the BIOS.
 
 
    S1      Quick suspend to RAM.  The CPU enters a lower power
 
    state, but most peripherals are left running.
 
 
    S2      Lower power state than S1, but with the same basic char-
 
    acteristics.  Not supported by many systems.
 
 
    S3      Suspend to RAM.  Most devices are powered off, and the
 
    system stops running except for memory refresh.
 
 
    S4      Suspend to disk.  All devices are powered off, and the
 
    system stops running.  When resuming, the system starts
 
    as if from a cold power on.  Not yet supported by FreeBSD
 
    unless S4BIOS is available.
 
 
    S5      System shuts down cleanly and powers off.
 
 
/boot/loader.conf:
 
 
hw.acpi.reset_video
 
    Enables calling the VESA reset BIOS vector on the resume path.
 
    This can fix some graphics cards that have problems such as LCD
 
    white-out after resume.  Default is 0 (disabled).
 
 
man 4 powerd
 

Revision as of 11:10, 9 November 2010

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Previous: Printer Troubleshooting
Next: ACPI



Laptop users are concerned with getting the most out of their battery power. KDE provides a power management utility that makes it easy to see your current battery settings and to create power profiles that best match your needs.

Figure 7.4a:

Power1.png

Figure 7.4b:

Power2.png

Figure 7.4c:

Power3.png

Figure 7.4d:

Power4.png

Figure 7.4e:

Power5.png