Battery Life Discussion Thread

Discussion in 'Lenovo (IBM)' started by g2tl, Jun 13, 2008.

?

Idle Wattage, "max brightness with wifi on" and "min brightness with wifi off" w

  1. max: Over 14

    10 vote(s)
    40.0%
  2. max: 12-14

    6 vote(s)
    24.0%
  3. max: 10-12

    0 vote(s)
    0.0%
  4. max: 8-10

    1 vote(s)
    4.0%
  5. max: Under 8

    5 vote(s)
    20.0%
  6. min: Over 13

    2 vote(s)
    8.0%
  7. min: 11-13

    5 vote(s)
    20.0%
  8. min: 9-11

    8 vote(s)
    32.0%
  9. min: 7-9

    2 vote(s)
    8.0%
  10. min: Under 7

    7 vote(s)
    28.0%
Multiple votes are allowed.
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  1. g2tl

    g2tl Scribbler - Standard Member

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    whoa whoa, calm down haha
    I'll see what I can do when I get some time
     
  2. pibach

    pibach Scribbler - Standard Member

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    I think I found one of the culprits:
    I updated the LAN driver to the one from the Intel site (9.10.8.0 instead of 9.7.251.0) setting all "Wake on Lan", driver and Bios to off (did not work with the previous version). In my first measurement I get ~20 minutes longer lifetime on battery. Weird. I'll keep an eye on that...
     
  3. pibach

    pibach Scribbler - Standard Member

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    Unfortunately this was not true and just because of the wrong runtime estimation of Vista :(

    But I just installed Ubuntu 7.10. on my x61t and get way better battery life (see other Thread). So this magical battery drain of the x61t versus the x61s seems to be somehow Vista/Wacom related?
     
    Last edited by a moderator: May 18, 2015
  4. x60t

    x60t Pen Pal - Newbie

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    Put in sleep for 8 hours. The time battery drops from 90% to 68%. 4-cell battery for x61t. Nothing connected.
     
  5. pibach

    pibach Scribbler - Standard Member

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    This is a known issue. Switch off "Wake on Lan" (Bios+Device Manager) and disable USB external device powering in Bios. Then the sleep drain should go down to around 0,5 Watt to just power the RAM and some related chips.
     
  6. pibach

    pibach Scribbler - Standard Member

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  7. pibach

    pibach Scribbler - Standard Member

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    I have a hypothesis and would like to ask for your help to figure out more:

    I suspect SATA Controller not to go into sleep mode because of some driver fault with Vista. This may only apply to those running "Compatibility Mode" and Vista, as I do. You can switch the SATA mode in Bios settings, but unfortunately this requires a full new Vista installation.

    If you run "AHCI Mode" with the "Intel Matrix Storage driver" seemingly this does put the SATA controller to sleep and gets the HDD to spin down. This might require write caching enabled. Or maybe works only with Turbo Memory. If true, all here getting good battery runtimes probably have AHCI with Maxtrix driver and get their HDD to spin down completely and let the SATA controller sleep. Together this can sum up to approx. 2-3 Watt.

    Anybody can back up or disprove this hypothesis?
     
  8. g2tl

    g2tl Scribbler - Standard Member

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    Ok, I tested the Wattage (using NHC) with and without the TM. (Both with write caching on and off, which didn't seem to matter)
    I got about .1W LESS without the TM. But then, that's the idle W, so in theory, if the TM allows the HDD to stay low for longer, then although the TM itself consume some W, in the end it does save some battery life.
    What's really bothering me is that I still cannot get the W lower than 10W in XP, whereas in Vista, as soon as the HDD spins down, the W goes down fairly quickly to around 8W.
     
  9. pibach

    pibach Scribbler - Standard Member

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    g2tl, thanks for this test.
    I think it has something to do with AHCI power management. There I suppose the Intel Matrix Storage driver to have some advantage over the standard one. Some devices seem to be delivered with AHCI on, some of which come with the Matrix driver and some are set to "Compatibility Mode" (mine is) and the standard driver. Usually XP should come with the latter, which might not allow for the deeper sleep modes of AHCI. HDD together with the SATA controller both can account for 1-3 Watt, depending on power saving settings.

    Now this is a bit difficult to test, as switching from Compatibility Mode to AHCI changes all the Disk access. As far as I know this requires a full new install.
     
  10. g2tl

    g2tl Scribbler - Standard Member

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    I do have it set as AHCI, and XP runs fine.
    It does not require a reinstall, as I have tried a few times trying to install XP.
    I still don't understand why the power consumption in XP is so high.
    If what you say is true, then the AHCI mode should allow for better power management, but I cannot imagine having even higher power consumption by switching to compatibility mode.
    Maybe I'll give it a try.
     
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