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wsko
Fanfold Paper
Posts: 13
Registered: ‎02-18-2010
Location: USA
Views: 52,573
Message 1 of 88

Changing Charge Threshold on ThinkPads under Windows 8 without Power Manager

Hello,

 

After poking around for a while, I finally figured out how to change the charge threshold on a ThinkPad computer without Power Manager GUI installed.  This has been tested to work on my x220 tablet.  Here is how:

 

  1. Install Power Management Driver (tested with v1.66.0.17)
  2. Install Lenovo Settings Dependency Package (v1.0.5.2).  This package actually contains the necessary code to interface to the battery controller chip.  
  3. Open the Start screen with the Windows button, then type regedit.exe.  Right click on regedit.exe and run as administrator.
  4. Find the registry key [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Lenovo\PWRMGRV\Data].
  5. Now you should see 4 entries that are currently set to 0: ChargeStartControl, ChargeStartPercentage, ChargeStopControl, ChargeStopPercentage.
  6. The first 2 entries, ChargeStartControl and ChargeStartPercentage, change the starting charge threshold.  Double click on each of them and change them both to your desire starting charge threshold.  For example, if you want to start charging the battery only when the bettery level is below 40%, change both of these entries to 40.  Also, make sure you have Decimal selected as the base unit.
  7. The second 2 entries, ChargeStopControl and ChargeStopPercentage, change the stopping threshold.  Double click on each of them and change them both to your desire stop threshold.  For example, if you want to stop charging the battery at 80%, change both of these entries to 80 (base in Decimal).
  8. Restart your computer.  Somehow, the values in these registry keys get written into the battery controller after restarting the computer.  
Shawn3090
802.11n
Posts: 274
Registered: ‎10-26-2010
Location: US
Views: 52,567
Message 2 of 88

Re: Changing Charge Threshold on ThinkPads under Windows 8 without Power Manager

Excellent. I changed the registry keys and will test it tomorrow. Did you try any of the other settings? BRTNessGragualReduction seems useful as my brightness jumps from 0% to 40% with one keypress on my T510.

 

Now if someone who knows what they are doing could make a gui for this...


W540: i7-4700mq, K2100m, 16 GB RAM, 500 GB Samsung 840 EVO
T510: i7-620m, NVS 3100m, 8 GB RAM, 500 GB Samsung 840 EVO
wsko
Fanfold Paper
Posts: 13
Registered: ‎02-18-2010
Location: USA
Views: 52,561
Message 3 of 88

Re: Changing Charge Threshold on ThinkPads under Windows 8 without Power Manager

I haven't tried any other registry keys yet.  But I don't see such a big brightness jump on my x220 tablet, so I don't know if changing that registry key would do anything on my x220t.

 

thorcik
Token Ring
Posts: 68
Registered: ‎07-30-2012
Location: Warsaw, PL
Views: 52,535
Message 4 of 88

Re: Changing Charge Threshold on ThinkPads under Windows 8 without Power Manager

Great news, mate. I'll check it as soon as I return home Smiley Happy

T60/T618895-W4M, UXGA, T9300, 8GB RAM, Vertex3, Intel 6300 Win8.1
R61e 7649-W1Z, T7250, Intel 6300
CharlyAR
802.11n
Posts: 393
Registered: ‎01-17-2012
Location: NZ
Views: 52,512
Message 5 of 88

Re: Changing Charge Threshold on ThinkPads under Windows 8 without Power Manager

Thanks for the tip!

If I wasn't so lazy, I'd make a GUI... Smiley Tongue
_

ThinkPad X1 Yoga 2nd Gen, ThinkPad X230, ThinkPad S430, ThinkPad T420, ThinkPad E420s, ThinkPad E10s

vickilh
Serial Port
Posts: 31
Registered: ‎10-31-2011
Location: North Carolina
Views: 52,499
Message 6 of 88

Re: Changing Charge Threshold on ThinkPads under Windows 8 without Power Manager

Did this for my T61 Thinkpad.  It appears to be working! 

 

Notes:

- I used PM Driver v1.66.9.07

- In #4 of instructions above, my path didn't have the "\Wow6423Node\".

 

Thanks wsko!

Remeniz
Token Ring
Posts: 79
Registered: ‎06-12-2012
Location: Peterborough - England
Views: 52,486
Message 7 of 88

Re: Changing Charge Threshold on ThinkPads under Windows 8 without Power Manager

I've set up a dual boot config' with Windows 7 and 8.

 

And without any modification to Windows 8 it's following the Charge thresholds as in my Windows 7 install......

 

 

_____________________________________________________________________________________________________
T410(2537) -- i7 620M - Intel HD GPU (1440 x 900) - 8GB RAM - 128GB Crucial M4 SSD - 250GB Hitachi HDD - Windows 7 & 8 Pro
Stepinsky
Punch Card
Posts: 64
Registered: ‎05-31-2011
Location: DE
Views: 52,448
Message 8 of 88

Re: Changing Charge Threshold on ThinkPads under Windows 8 without Power Manager

Charging thresholds are stored in battery memory. So once you defined your charging limits, they are fixed for all OS, even from Linux. From my understanding you may even find those thresholds on another device.

 

asarkar
What's DOS?
Posts: 1
Registered: ‎11-14-2012
Location: Home
Views: 52,300
Message 9 of 88

Re: Changing Charge Threshold on ThinkPads under Windows 8 without Power Manager


@wsko wrote:

Hello,

 

After poking around for a while, I finally figured out how to change the charge threshold on a ThinkPad computer without Power Manager GUI installed.  This has been tested to work on my x220 tablet.  Here is how:

 

  1. Install Power Management Driver (tested with v1.66.0.17)
  2. Install Lenovo Settings Dependency Package (v1.0.5.2).  This package actually contains the necessary code to interface to the battery controller chip.  

Could you please provide download links to these or attach to your post if possible? I installed the Power Management Driver but it does not show up. I can't find the Lenovo Settings Dependency Package.

Former Administrator
Posts: 8,592
Registered: ‎11-19-2007
Location: US
Views: 52,189
Message 10 of 88

Re: Changing Charge Threshold on ThinkPads under Windows 8 without Power Manager

wsko,

 

Thanks for contributing this well written proceedure!  

 

Mark

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