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2 Posts

11-12-2020

Germany

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  • Message 1 of 5

Thinkpad L480 USB-C not working after BIOS update to 1.40

2020-11-12, 0:54 AM

Hello,

 

I've been using the L480 (type 20LS, 20LT) for over two years now with no problems at all. For a few months now I had two external monitors plugged in, one directly by HDMI and one by USB-C to HDMI.

Just now I did a recommended BIOS update to version 1.40 (unfortunately I don't know which version I had before that) and all of a sudden the USB-C port stopped working. Entirely. Not even a USB-C flash drive gets detected anymore!

 

I already tried everything, including installing the latest chipset drivers by Intel and rolling back every version until BIOS version 1.26. Nothing seems to work. Only when I disconnect all devices but the USB-C device, it gets detected by the PC. Sometimes it doesn't even recognize the power adapter through the USB-C charging port.

 

Just so we're clear, I'm talking about the simple USB-C port that's not made for charging.

 

I'd be grateful for even the slightest hint!

 

Thank you in advance! 

Tom

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7 Posts

05-24-2020

India

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  • Message 2 of 5

Re:Thinkpad L480 USB-C not working after BIOS update to 1.40

2021-01-30, 3:29 AM

Hi,

 

I too am facing the same problem on my new T14 Gen1 AMD Thinkpad. Did you find a solution for this? In my case initially there is no signal to my external monitor from USB Type C and when I power OFF and ON my laptop it starts working.

 

Thanks,

Gautam.

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1248 Posts

01-08-2021

Philippines

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  • Message 3 of 5

Re:Thinkpad L480 USB-C not working after BIOS update to 1.40

2021-02-01, 20:54 PM

Hello mindentropy,

 


Greetings

I suggest that you completely uninstall the drivers, then reinstall it by getting the fresh copy from the support site

Update us how it goes


Regards, 
Lorenzo_Lenovo



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2 Posts

11-12-2020

Germany

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  • Message 4 of 5

Re:Thinkpad L480 USB-C not working after BIOS update to 1.40

2021-02-01, 21:08 PM
Hi Gautam, even though I couldn't figure out the Problem, approx. 4 weeks after the problem first occured it started working again. I've got all automatic updating services deactivated and nothing got changed software or hardware wise. Sorry that I couldn't help. Good luck tho!
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1248 Posts

01-08-2021

Philippines

85 Signins

6251 Page Views

  • Posts: 1248
  • Registered: ‎01-08-2021
  • Location: Philippines
  • Views: 6251
  • Message 5 of 5

Re:Thinkpad L480 USB-C not working after BIOS update to 1.40

2021-02-12, 20:43 PM

Hello kxsxcky,

 

I suggest that you continue to monitor the computer.
If you encountered any issues, feel free to voice it out here on the forums

 


Regards, 
Lorenzo_Lenovo



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