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Thinkpad P50, only charges when off

2017-08-02, 13:28 PM

This started this morning... it was fine yesterday. 

 

Basically the laptop only charges when off - based on the charge indicator near charging port. When i boot into windows charging stops and the laptop sleeps frequently as it thinks it is on battery. 

 

If i plug the ac adapter in when the machine is on, the light on top cover blinks 2 times. 

 

Currently at 74% so i don't think it has anything to do with the battery charging function that cycles the battery, but if it does, how do i use my machine and prevent it from sleeping without changing settings? 

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6350 Posts

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Re: Thinkpad P50, only charges when off

2017-08-02, 13:38 PM

It sounds like airplane power mode was enabled.  Did this behavior start happening after you turned on airplane wireless mode?  ThinkPad has a feature where turning on airplane wireless mode will automatically turn on airplane power mode.  And on the workstation-class systems like P50, airplane power mode has the effect of disabling the AC adapter because it cannot be restricted to less than ~45 watts like airplane power circuits require.

 

Anyway, try turning off airplane wireless mode (or toggle it).  If that doesn't work, open Lenovo Settings, go to the Power section, and manually disable airplane power mode there.  (I'm assuming you are on Win10.)

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Re: Thinkpad P50, only charges when off

2017-08-02, 13:49 PM

wrote:

It sounds like airplane power mode was enabled.  Did this behavior start happening after you turned on airplane wireless mode?  ThinkPad has a feature where turning on airplane wireless mode will automatically turn on airplane power mode.  And on the workstation-class systems like P50, airplane power mode has the effect of disabling the AC adapter because it cannot be restricted to less than ~45 watts like airplane power circuits require.

 

Anyway, try turning off airplane wireless mode (or toggle it).  If that doesn't work, open Lenovo Settings, go to the Power section, and manually disable airplane power mode there.  (I'm assuming you are on Win10.)


Thanks for that, you hit the nail on the head. Amazing I couldn't find this with searching or online anywhere. 

 

I am still getting used to windows 10, but i had no idea that Airplane mode affected the charge circuit, although it makes sense now that you explained it.

 

Thanks again, now i know. 


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Re: Thinkpad P50, only charges when off

2017-08-02, 14:07 PM

In Lenovo Settings there is an option to turn off the automatic syncing.  Then you won't be bit by this problem anymore.  I know this isn't an ideal situation and has tripped up other users.  This was just discussed in the Tech Exchange "pervasive issues" thread, see post #355 and my reply at #356, feel free to add additional comments there if any.

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Re: Thinkpad P50, only charges when off

2017-08-02, 14:08 PM

wrote:

In Lenovo Settings there is an option to turn off the automatic syncing.  Then you won't be bit by this problem anymore.  I know this isn't an ideal situation and has tripped up other users.  This was just discussed in the Tech Exchange "pervasive issues" thread, see post #355 and my reply at #356, feel free to add additional comments there if any.


I don't mind the feature.  I just had no idea it was there. Now that i know about it, I don't mind it. 


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Re: Thinkpad P50, only charges when off

2017-08-06, 16:57 PM

I thought that was it - but 2 days later back to the same problem. I am not in Airplane mode yet the device shows it is not charging unless i power it off. As soon as i power on, the green charging light goes off. There is a bios update i can't install as "no ac power connected"

 

Any other ideas?

 


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Re: Thinkpad P50, only charges when off

2017-08-06, 17:03 PM

wrote:

I thought that was it - but 2 days later back to the same problem. I am not in Airplane mode yet the device shows it is not charging unless i power it off. As soon as i power on, the green charging light goes off. There is a bios update i can't install as "no ac power connected"

 

Any other ideas?

 


Nevermind.... The Windows toggle for airplane power mode is different then the one under "Lenovo Settings"

 

I had turned off the windows quick toggle, and that fixed my problem last week. However now i see the lenovo settings app has this also, and it was on - no idea how. But apparently the airplane mode windows toggle controls another set of Lenovo toggles, but they are not necessarily in sync. 

 

Disabling airplane mode under Lenovo Settings has now fixed it. 


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Re: Thinkpad P50, only charges when off

2017-08-06, 17:08 PM

wrote:

In Lenovo Settings there is an option to turn off the automatic syncing.  Then you won't be bit by this problem anymore.  I know this isn't an ideal situation and has tripped up other users.  This was just discussed in the Tech Exchange "pervasive issues" thread, see post #355 and my reply at #356, feel free to add additional comments there if any.


Can you link to that thread? I can't seem to find it.

 

Thanks


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Re: Thinkpad P50, only charges when off

2017-08-07, 13:06 PM

It appears that Lenovo settings is enabling airplane mode whenever i come out of hibernate - where do i go to disable this?


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  • Message 10 of 14

Re: Thinkpad P50, only charges when off

2017-08-07, 13:15 PM

wrote:

It appears that Lenovo settings is enabling airplane mode whenever i come out of hibernate - where do i go to disable this?


BTW, I have disabled auto-detection. And the problem persists. I will try to trap the exact cause - possibly some other trigger aside from hibernate.


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