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codeHusky
Serial Port
Posts: 24
Registered: ‎06-29-2019
Location: US
Views: 2,414
Message 11 of 187

Re: Bring back fan control to the Legion Y740

Could you try reverting to 1.08 and let us know how it goes / how you did it?

obidan
What's DOS?
Posts: 2
Registered: ‎07-02-2019
Location: NL
Views: 2,332
Message 12 of 187

Re: Bring back fan control to the Legion Y740

Having similar temperature issues now. FN + Q seems to do a much worse job .

Muzava
Paper Tape
Posts: 7
Registered: ‎05-18-2019
Location: PT
Views: 2,316
Message 13 of 187

Re: Bring back fan control to the Legion Y740

I don't have acess of the v1.08 Bios, only the v1.06, but I can try to revert to the v1.06.

 

Another the update changed was the CPU TDP values. 

codeHusky
Serial Port
Posts: 24
Registered: ‎06-29-2019
Location: US
Views: 2,309
Message 14 of 187

Re: Bring back fan control to the Legion Y740

What are the new tdp values?

Muzava
Paper Tape
Posts: 7
Registered: ‎05-18-2019
Location: PT
Views: 2,291
Message 15 of 187

Re: Bring back fan control to the Legion Y740

Far I know the CPU only boost till 45W instead of 60W, but most of the time it will keep near that value making the CPU Throtlle.

 

I'm back to V1.06 and till now it is ok. I had a problem with Killer WIFI (code 10), but a simple bios reset to optimal options fixed it.

codeHusky
Serial Port
Posts: 24
Registered: ‎06-29-2019
Location: US
Views: 2,289
Message 16 of 187

Re: Bring back fan control to the Legion Y740

Please make a step by step guide to downgrading and post it here so we can save our fellow y740 users.

OHomemDoLixo
Punch Card
Posts: 38
Registered: ‎06-15-2019
Location: PT
Views: 2,285
Message 17 of 187

Re: Bring back fan control to the Legion Y740

YOU WOULD BE A LEGEND <3

codeHusky
Serial Port
Posts: 24
Registered: ‎06-29-2019
Location: US
Views: 2,232
Message 18 of 187

Re: Bring back fan control to the Legion Y740

Per a reddit post by me:

 

Here's how you can downgrade.

FILES---

Y740 ICHg: https://download.lenovo.com/consumer/mobiles/avcn18ww.exe

Y740 IRH/IRHg: This doesn't apply to you. Only ICHg variants have 1.09, as far as I can tell. If you have a 1660ti, this is you. Otherwise, confirm in Vantage. If for whatever reason you do have 1.09, going to the Lenovo page for your sku should point you to 1.06.

Steps-----

1. Enter the BIOS, press F2 repeatedly. If you have hotkey mode on, you may need to mash FN+F2

2. Navigate to the page with Bios Backflash. Enable that.

3. save and reset with F10

4. Download and run the file linked above

5. Flash the new bios

IIRC one person after backflashing had issues with wifi not working, giving code 10 in device manager. Going into the bios again and restoring to defaults fixed it for them.

 

 

gaurav106
What's DOS?
Posts: 1
Registered: ‎07-03-2019
Location: IN
Views: 2,173
Message 19 of 187

Re: Bring back fan control to the Legion Y740

Need an official update from Lenovo thaat fixes this issue.

I hope it comes soon!Smiley Frustrated

Scrumbles
Paper Tape
Posts: 4
Registered: ‎07-01-2019
Location: US
Views: 2,158
Message 20 of 187

Re: Bring back fan control to the Legion Y740

I would personally recommend going back to the previous BIOS, I was able to get it back to the previous version and it runs just like before, very pleased

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