Difference between revisions of "Power Management"

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man 4 acpi
    AC line state (1 means online, 0 means on battery power).
    Suspend state (S1-S5) to enter when the lid switch (i.e., a note-
    book screen) is closed.  Default is ``NONE'' (do nothing).
    Suspend state (S1-S5) to enter when the power button is pressed.
    Default is S5 (power-off nicely).
    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.
    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).
    Wait this number of seconds between preparing the system to sus-
    pend and actually entering the suspend state.  Default is 1 sec-
    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.
    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 10:10, 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:


Figure 7.4b:


Figure 7.4c:


Figure 7.4d:


Figure 7.4e:


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