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100 Posts

06-01-2014

India

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  • Message 11 of 83

Re: y540 heat and BIOS issues

2019-10-31, 13:00 PM

Go to BIOS, enable BIOS backflash, save n reboot. Go to c drive, BIOS folder, find n install 27WW BIOS 

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43 Posts

11-01-2019

Poland

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  • Message 12 of 83

Re: y540 heat and BIOS issues

2019-11-01, 20:31 PM

Hello,

I'm a new owner of Lenovo Legion Y540 (I7-9750H    RTX2060) and joined to this community to ask you some questions.
Out of the box I launched Lenovo Vantage app and it did some automatical updates including a BIOS upgrade from 28WW to 32WW.
I did undervolting of CPU and cache -125mV and also overclocking of GPU  (core clock +160MHz and memory clock +320MHz).
FPS are really nice during playing Witcher 3 (75-105) on UBER settings, 1080p, NVIDIA hairworks ON - depending on location on map.
CPU frequency is stable about 3.6-3.9GHz but CPU is quite hot with temp between 67-94C depending on location on map (GPU keeps ca. 65C).
In Lenovo Vantage I use BALANCED mode and battery is set to BETTER PERFORMANCE.
I noticed that if I rise a rear case about 2cm up then due to better air flow a CPU temps are lower ca. 5-10C.
And now my questions:
1. from your experience, is it worth do downgrade BIOS or better wait for newer/corrected version with FN+Q functionality ?
2. is it absolutely safe for my specification to downgrade BIOS from 32WW to 27WW (I mean no hardware problems, eg. CPU, GPU, WIFI card, etc. are compatible with this older BIOS version) ?
3. will CPU temp will be much lower? what temps do you have with 27WW ?
4. will I receive FN + Q functionality to control fans speed ?
5. Should I uninstall Lenovo Vantage then (I understand that now fans speed is controled via Vantage app depending on mode I choose, so I wanna avoid conflicts between FN+Q and Vantage modes) ?
6. or maybe I should downagrade to lower BIOS version, eg 26WW or come back to factory one I had out of the box ?

Thank you for anwsers :)

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86 Posts

08-28-2019

Czech Republic

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  • Message 13 of 83

Re: y540 heat and BIOS issues

2019-11-02, 17:46 PM

I have tested Bios version all the way from 21WW to 32WW and 26WW has best temps so I stick to that, also 27 is ok but others are meh.

 

1. from your experience, is it worth do downgrade BIOS or better wait for newer/corrected version with FN+Q functionality ? "I doubt it will come anytime soon as they removed it from all new legion models, they just want users to use their "improved" fan curves instead."


2. is it absolutely safe for my specification to downgrade BIOS from 32WW to 27WW (I mean no hardware problems, eg. CPU, GPU, WIFI card, etc. are compatible with this older BIOS version) ? "BIOS does not change hardware compatability so don't worry about that."


3. will CPU temp will be much lower? what temps do you have with 27WW ?

 

27WW I have following temps: Witcher 3 GPU 64 degrees and and around 72 CPU.

26WW 62 GPU and 68 CPU

 

Borderlands 3 26WW 63 and 69,70 CPU

slightly more on 27WW.

on 27WW I had spikes to 80+ sometimes but it was okay vast majority of time.

4. will I receive FN + Q functionality to control fans speed ?

"No"


5. Should I uninstall Lenovo Vantage then (I understand that now fans speed is controled via Vantage app depending on mode I choose, so I wanna avoid conflicts between FN+Q and Vantage modes) ?

"It won't give you that option nonetheless so I recommend keep it on your system"


6. or maybe I should downagrade to lower BIOS version, eg 26WW or come back to factory one I had out of the box ? "As I said 21,23 are just as bad as newest ones, they were not tuned at time.

 

very important!!! Rise back of your laptop, this will help tremendously as mentioned in this thread. And you should not be thermal throttling on any of these versions so you will be probably due to repaste your CPU anyway.

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43 Posts

11-01-2019

Poland

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  • Message 14 of 83

Re: y540 heat and BIOS issues

2019-11-02, 20:07 PM

thanks for detailed answers.
But to be sure, on BIOS version 26WW or 27WW you don't have possibility to adjust speed of fans via FN + Q buttons ?
I saw on YT that you can change fans speed by pressing combination of those buttons in sequence: SILENT, AUTO, MAX/PERFORMANCE and again and again.

Do you have also the BIOS "bhcn26ww" to share or at least link to it ?
Latest I've found on net and downloaded is "bhcn27ww".
thanks :)

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86 Posts

08-28-2019

Czech Republic

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  • Message 15 of 83

Re: y540 heat and BIOS issues

2019-11-02, 21:56 PM

You don't have tht option even on oldest bios you can find (21WW). This is because it was possible in first Bios of Y740 (1st gen) but they removed that option there before they started producing Y540 so there is no way for that functionality on Y540.

 

What do you mean? You click on Fn +Q now it will change power modes (silent, balanced, performance) but that does not change fan speed that much, when you are under load it will run fast, only on quiet it will run slower because TDP is lower and so are temps obviously.

 

Sure, 

https://download.lenovo.com/consumer/mobiles/bhcn26ww.exe

 

You can try 23 and 21 as well, just change "26" in url but I would not recommend it.

 

Let me know how it goes, you can do some further undervolt, leave cache at 125mV and drag core to 150mV, that should be still stable.

 

No problem, neighbour. :)

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43 Posts

11-01-2019

Poland

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  • Message 16 of 83

Re: y540 heat and BIOS issues

2019-11-02, 22:10 PM

Thanks, probably you're right and on YT I saw Y740 with older BIOS.
26WW - I will give it a try ;)

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86 Posts

08-28-2019

Czech Republic

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  • Message 17 of 83

Re: y540 heat and BIOS issues

2019-11-02, 22:12 PM

Don't forget to enable Bios back flash directly in BIOS Roger.

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86 Posts

08-28-2019

Czech Republic

104 Signins

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  • Posts: 86
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  • Message 18 of 83

Re: y540 heat and BIOS issues

2019-11-03, 20:21 PM

Any progress? 

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43 Posts

11-01-2019

Poland

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  • Message 19 of 83

Re: y540 heat and BIOS issues

2019-11-03, 20:50 PM

No, I hadn't free time to play with - just downloaded 26WW to be prepared.
Probably will try on Tuesday evening.

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11 Posts

09-19-2019

Saudi Arabia

22 Signins

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  • Registered: ‎09-19-2019
  • Location: Saudi Arabia
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  • Message 20 of 83

Re: y540 heat and BIOS issues

2019-11-03, 21:29 PM

thank you .. i did what you said better preformance in ww26 :)

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