Results 1 to 5 of 5
  1. #1
    Star Lounger
    Join Date
    Dec 2009
    Location
    UK
    Posts
    60
    Thanks
    0
    Thanked 20 Times in 2 Posts

    Power management

    I have an old-ish Dell laptop which is running Windows 8 from a fresh install and fully updated just fine, however battery life is a LOT lower than it should be.

    I ran the powercfg energy report and it reports a number of things:

    1. USB devices not entering suspend:
    Device Name: USB Root Hub
    Host Controller ID: PCI\VEN_8086&DEV_2832
    Host Controller Location: PCI bus 0, device 29, function 2
    Device ID: USB\VID_8086&PID_2832

    Device Name: Generic USB Hub
    Host Controller ID: PCI\VEN_8086&DEV_2832
    Host Controller Location: PCI bus 0, device 29, function 2
    Device ID: USB\VID_0B97&PID_7761
    Port Path: 1

    Device Name: O2Micro OZ776 USB CCID Smartcard Reader
    Host Controller ID: PCI\VEN_8086&DEV_2832
    Host Controller Location: PCI bus 0, device 29, function 2
    Device ID: USB\VID_0B97&PID_7772
    Port Path: 1,2



    2. USB Device Rarely Entering Selective Suspend
    Device Name: USB Root Hub
    Host Controller ID: PCI\VEN_8086&DEV_2834
    Host Controller Location: PCI bus 0, device 26, function 0
    Device ID: USB\VID_8086&PID_2834
    Time Suspended (%): 13

    Device Name: Dell Wireless 350 Bluetooth Module
    Host Controller ID: PCI\VEN_8086&DEV_2834
    Host Controller Location: PCI bus 0, device 26, function 0
    Device ID: USB\VID_413C&PID_8103
    Port Path: 2
    Time Suspended (%): 22



    3. Platform Timer Resolutions too small (rapid)
    The default platform timer resolution is 15.6 ms (15625000 ns) and should be used whenever the system is idle. If the timer resolution is increased, processor power management technologies may not be effective. The timer resolution may be increased due to multimedia playback or graphical animations.

    Current Timer Resolution (100 ns units) 10001
    Maximum Timer Period (100 ns units) 156001


    The stack of modules responsible for the lowest platform timer setting in this process.
    Requested Period: 10000
    Requesting Process Path: \Device\HarddiskVolume3\Program Files (x86)\Google\Chrome\Application\chrome.exe



    4. The CPU states are:

    Platform Power Management Capabilities:Processor Power Management Capabilities
    Effective processor power management enables the computer to automatically balance performance and energy consumption.
    Group 0
    Index 0
    Idle State Count 3
    Idle State Type ACPI Idle (C) States
    Nominal Frequency (MHz) 1801
    Maximum Performance Percentage 100
    Lowest Performance Percentage 44
    Lowest Throttle Percentage 5
    Performance Controls Type ACPI Performance (P) / Throttle (T) States


    Can anyone help improve any of the above?

    Many thanks.

    P

  2. #2
    Super Moderator CLiNT's Avatar
    Join Date
    Dec 2009
    Location
    California & Arizona
    Posts
    6,121
    Thanks
    160
    Thanked 609 Times in 557 Posts
    How to Utilize S3 Standby
    See the above article. I think all you need are some power management tweaks.
    If your hardware is too antiquated you might not have too many options in terms of conservative power management.
    DRIVE IMAGING
    Invest a little time and energy in a well thought out BACKUP regimen and you will have minimal down time, and headache.

    Build your own system; get everything you want and nothing you don't.
    Latest Build:
    ASUS X99 Deluxe, Core i7-5960X, Corsair Hydro H100i, Plextor M6e 256GB M.2 SSD, Corsair DOMINATOR Platinum 32GB DDR4@2666, W8.1 64 bit,
    EVGA GTX980, Seasonic PLATINUM-1000W PSU, MountainMods U2-UFO Case, and 7 other internal drives.

  3. #3
    Star Lounger
    Join Date
    Dec 2009
    Location
    UK
    Posts
    60
    Thanks
    0
    Thanked 20 Times in 2 Posts
    Thanks for the pointer but I am talking about battery time when I am actively using the laptop (i.e. when I can't use S3 standby).

    P

  4. #4
    3 Star Lounger
    Join Date
    Dec 2009
    Location
    Skelmersdale, Lancashire, UK
    Posts
    254
    Thanks
    44
    Thanked 10 Times in 10 Posts
    How old's your battery? They don't last forever.

  5. #5
    Star Lounger
    Join Date
    Dec 2009
    Location
    UK
    Posts
    60
    Thanks
    0
    Thanked 20 Times in 2 Posts

    Battery status

    Quote Originally Posted by A1ex View Post
    How old's your battery? They don't last forever.
    Primary battery is quite sound (c. 90% of spec. according to powercfg) - but I also have an almost brand new second battery in the media slot.

    However the battery lasts (maybe) 60% of the time it did with Win7 Pro.

    P

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •