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664 Posts

10-21-2011

DE

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Re: P51 - Heavy Throttling on Battery

2017-07-26, 20:59 PM

@someotherguy,

 

thanks for that update! Its fine if the CPU can´t perform quite as well as on AC, but running on 800 MHz its simply not usable. So I will take any fix, even if it isn´t the 100 % full performance as on AC.

 

@PaulMurdock,

 

please try to keep this thread on-topic, there is a different thread for your problem. As for my P51 (E3-1505M V6), it hits 98 °C on two cores when running Prime95. Though thats with Small FFTs, so the maximum heat test. It never goes up to 100 C° or beyond and on the other two cores it stays in the 80 °C range. In the Prime95 Blend test, which also uses 100 % of the CPU, the CPU stays under 90 °C.

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6574 Posts

10-29-2009

NC

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Re: P51 - Heavy Throttling on Battery

2017-07-26, 23:09 PM

wrote:

How about when on A.C.? My p51 gets up to 100C.. it's my 2nd one,  first one was replaced and 2nd one had the issue, and a service tech has replaced the heat sink assy. Still 100C.. 

 

It appears P51 design allows for 100C on AC.


I got up to 99C on AC.  So I think you are probably right about the design.

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8 Posts

07-28-2017

CN

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Re: P51 - Heavy Throttling on Battery

2017-07-28, 11:36 AM

Lenovo Factory used Thermal Grease is too bad. I change the Thermal Grease. Now , AIDA64's Street Test(Not Only FPU), The thermal is 90℃ in 7820HQ(Overlock 4x External Clock)

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88 Posts

06-08-2017

GB

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Re: P51 - Heavy Throttling on Battery

2017-07-28, 19:10 PM

Would you be willing to commit the P series machines being designed to operate at 100c? Where did you gather this information? I'd like to pass it off to some of the Lenovo staff I'm in contact with.  
I've spoken to people at Intel, and many people at your headquarters, who all assure me the chipset is not supposed to be running at such high temperatures.....  

P71 Xeon E3-1535M v6, 64GB RAM, NVIDIA P5000 GPU, 1TB Samsung SM961 PCIe-NVMe SSD x 2, Seagate Firecuda 2TB SSHD x2, EM7455 WWAN
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6574 Posts

10-29-2009

NC

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Re: P51 - Heavy Throttling on Battery

2017-07-28, 20:23 PM

I have no idea about the thermal design, I'm only reporting that my P51 also runs up to 99C when I use the Prime95 torture test.  I just noticed there is another thread about the 100C concern.  I will ask the P51 HW team for a comment and post it there.

 

Let's stop talking temps in this thread which is supposed to be about throttling on battery.  Thanks.

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6574 Posts

10-29-2009

NC

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  • Message 56 of 71

Re: P51 - Heavy Throttling on Battery

2017-08-01, 13:44 PM

The new BIOS/ECFW which fixes the issue described in this thread has been released:

http://pcsupport.lenovo.com/us/en/products/LAPTOPS-AND-NETBOOKS/THINKPAD-P-SERIES-LAPTOPS/THINKPAD-P51-TYPE-20HH-20HJ/downloads/DS121296

 

 From the readme:

  • (New) Enhance performance in DC mode when CPU loading is low.

 

 

0 person found this solution to be helpful.

This helped me too

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12 Posts

02-24-2014

US

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Re: P51 - Heavy Throttling on Battery

2017-08-01, 15:02 PM

This is an improvement, but it is still extremely disappointing to see such poor performance when on battery. Try and do anything that even remotely uses the CPU and the frequency drops to around 1GHz., even on the highest power settings in the BIOS and in Windows. Why is this system so performance restricted when on battery?

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664 Posts

10-21-2011

DE

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Re: P51 - Heavy Throttling on Battery

2017-08-02, 9:42 AM

That update completely solved the issue for me. Finally, the P51 is usable when running on battery. Thanks for your efforts someotherguy!

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1 Posts

08-03-2017

FI

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  • Message 59 of 71

Re: P51 - Heavy Throttling on Battery

2017-08-03, 9:41 AM

I'm trying to update my P51 BIOS using the 1.11 "Bootable CD" .iso-image using the "geteltorito + dd" approach from Linux. The laptop boots to the update program correctly but I get a "the system program file was not found on the cd"-error when I try to start the BIOS update procedure. Could anyone else verify if the .iso-images work correctly for them? I found some references on other subforums here that sometimes the supplied .iso-image has been incorrect and Lenovo has updated it later.

 

UPDATE: Nevermind, it seems that the .iso worked after trying a few times. 

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10 Posts

01-21-2017

US

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  • Message 60 of 71

Re: P51 - Heavy Throttling on Battery

2017-08-03, 20:21 PM

Thanks someotherguy!  This is great and has fixed the problem on my system.  I had a specific command (mpv video player w/o gpu acceleration) which I could run that would trigger the cpu to get stuck at 800 MHz.  I'm happy to report that after this update it no longer gets stuck.

 

I do have a suggestion on how this fix could be further improved, though.

 

When running that mpv command, I mostly see the cpu maxing out all 8 threads at 3400 MHz.  But I also see the frequency dropping to 800 MHz for brief moments. The drops occur roughly once per second, and only last for about 5% of the time.  These drops don't occur on on AC power, so I assume they are due to the ECFW limiting power consumption, as you described earlier.

 

It seems like what is happenning is that maxing out the cpu is causing just barely more power consumption than what is allowed by the ECFW.  A graceful solution would probably be to drop the cpu frequency by a few percent to reduce the power consumption to an acceptable level.  Instead the ECFW overreacts and drops it all the way to 800MHz, which is way lower than needed, so it almost instantly boosts it back to 100%.

 

If possible, I would like to see a smarter alogorithm implemented in the ECFW to allow it to choose how far to reduce the cpu frequency, rather than the current all-or-nothing approach.

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