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4 Posts

04-14-2020

United Kingdom of Great Britain and Northern Ireland

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  • Message 21 of 96

Re:USB-C port not working on YOGA S740

2020-04-14, 7:19 AM
Hi, I've had a support request open for almost a month now. They have asked me to send this in for a repair, but what use would that be if its a firmware issue? I might send it in once this lockdown is over. I am surprised that Lenvovo isnt working on a fix for this, considering the number of people reporting this issue. (I am BIOS version 29 now, down from 31. But still have same issues)
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28 Posts

01-21-2018

United Kingdom of Great Britain and Northern Ireland

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  • Message 22 of 96

Re:USB-C port not working on YOGA S740

2020-04-14, 15:52 PM

I think the latest is 33. Have you tried that one?

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20 Posts

04-12-2020

France

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  • Message 23 of 96

Re:USB-C port not working on YOGA S740

2020-04-14, 17:55 PM

Same problem here. My laptop is connected on a Thinkpad Thunderbolt 3 Dock Gen 2 and the behavior is totally weird (USB 3.0 devices connected as USB 2.0, external monitor does not wake-up after sleep, on/off button on the dock is completely ineffective...). Hey Lenovo, would you mind taking a look at this ? First time Lenovo for me. I'd like not to regret it.

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4 Posts

04-14-2020

United Kingdom of Great Britain and Northern Ireland

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  • Message 24 of 96

Re:USB-C port not working on YOGA S740

2020-04-14, 18:27 PM
I saw that update online, but the changelog didn't mention anything about usbc fixes. I might give it a try later this week though.
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1 Posts

03-19-2020

Qatar

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  • Message 25 of 96

Re:USB-C port not working on YOGA S740

2020-04-15, 12:33 PM

i faced this issue many times, each time i search for new BIOS update to install it , in order to solve the issue. the USB C port will work for few days then the issue will be back.

 

meanwhile i installed the latest BIOS update BYCN33WW, i download it on 28/3/2020 , the USB C port worked for few days then it stopped again.

 

this issue is getting so serious and am not able to find other solution am waiting for the next BIOS version update to try again.

 

 

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7 Posts

01-05-2020

Croatia

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  • Message 26 of 96

Re:USB-C port not working on YOGA S740

2020-04-16, 11:56 AM

This is sooooo annoying - USB-C works 2/5 times.

Multiple reboots are needed to get it to work - after holding the power button 10 seconds.

 

Tried all BIOS updates - from 29 to 33. Tried Windows and Linux - same problems.

Version 29 has the same problems - some users say it works but I highly doubt that it works 100% of the time.

 

Running version 33 now - waiting for a new update

 

 ---- LENOVO please do something - too expensive device to have these problems. ----

 

USB-C is needed for HDMI and LAN - two basic things for a normal workday.

S740-14IIL
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4 Posts

04-14-2020

United Kingdom of Great Britain and Northern Ireland

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  • Message 27 of 96

Re:USB-C port not working on YOGA S740

2020-04-23, 16:59 PM
Have you contacted Lenovo support? I have a ticket with them. The only thing we can do now is to press Lenovo support for answers.
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20 Posts

04-12-2020

France

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  • Message 28 of 96

Re:USB-C port not working on YOGA S740

2020-04-25, 8:43 AM

Lenovo support? Good joke! Here is the reply I've got asking help using Yoga S740 (81RS) / TB3 dock gen 2 (40AN) combo :

 

"We do not know any (Thinkpad) dock which is compatible with our consumer range. They're only designed for our Thinkpad range."

 

So now, everyone knows what to think about the reliability of Lenovo's website, especially its Smartfind accessory finder...

 

https://accessorysmartfind.lenovo.com/#/products/40AN0135EU

 

 

First and last time Lenovo for me, for sure. Bad buzz to continue also.

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5 Posts

03-25-2020

Germany

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  • Message 29 of 96

Re:USB-C port not working on YOGA S740

2020-05-01, 8:58 AM

Rolled back to version 29 as written in my last post but it was all in vain. Today again the USB C did not work. I guess I"ll return it to the shop after this whole lockdown... little bit dissapointed in my first lenovo.

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3 Posts

04-25-2020

Korea (the Republic of)

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  • Message 30 of 96

Re:USB-C port not working on YOGA S740

2020-05-05, 4:24 AM

Here, same ploblem.

Really annoying.

 

I use external disk, second monitor, PLEOMAX HUB.

Firmware is BNCN35WW, model is C740-14IML.

 

First usb-c port is little stable.

I use the power cord plugged into the second port.

I changed the power management setting for all usb device to save power option.

(https://www.drivereasy.com/knowledge/solved-usb-device-not-recognized-in-windows-10-2/)

 

It is still stable.

 

Thanks to Lenovo, I learn a lot, ㅡ.ㅡ

 

If there is an error again, I will take a note.

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