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2 Posts

10-16-2018

CA

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T480 20L5 does not resume from sleep if plugged into AC adapter on BIOS 1.17

2018-10-16, 6:54 AM

Hi all,

 

My T480 (20L5) does not resume from sleep with the AC adapter plugged in on BIOS 1.17. The issue occurs both when resuming using the lid or the power button. Upon unplugging the AC adapter, the computer instantly resumes from sleep. The issue is resolved by reverting to BIOS 1.16. Issue occurs both in Windows 10 and in Ubuntu 18.04 LTS (kernel ver. 4.15.0).

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4 Posts

01-12-2009

US

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Re: T480 20L5 does not resume from sleep if plugged into AC adapter on BIOS 1.17

2018-12-04, 18:02 PM

I too have this problem with my T480 (20L5). Some additional details:

 

  1. The problem occurs when sleep is entered via hotkey or software timer.
  2. The fan keeps running in sleep mode as long as the AC adapter is attached. The fan stops as soon as the AC adapter is removed.
  3. The power button appears to be completely unresponsive when in the frozen sleep state: holding the power button for an extended time will not cause a hard system reset.

I usually keep my system plugged in, so I end up having to disconnect and reconnect the power adapter at least daily.

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4 Posts

01-12-2009

US

5 Signins

66 Page Views

  • Posts: 4
  • Registered: ‎01-12-2009
  • Location: US
  • Views: 66
  • Message 3 of 3

Re: T480 20L5 does not resume from sleep if plugged into AC adapter on BIOS 1.17

2018-12-04, 19:06 PM

The problem has been solved in a newer BIOS update (1.19 confirmed to work). Note that as of Dec-4-2018 you cannot get the update through Lenovo Vantage system update utility. You may need to download from the website.

https://pcsupport.lenovo.com/us/en/downloads/DS502355  for Win10 64-bit utility.

 

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