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5 Posts

09-02-2019

PL

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Re: T480 TDP throttle

2019-09-26, 7:38 AM
Ha ha ha ;-) Nice set!
I wonder if Lenovo is following this thread in the forum.
Shame on you, Lenovo!
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31 Posts

10-13-2015

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Re: T480 TDP throttle

2019-11-06, 18:35 PM

I've been having the same problem - my T480 w/ MX150 would hit some thermal limit then throttle down to 400MHz and take its own sweet time (sometimes never) deciding it could go faster, only to hit the same thermal limit and throttle back down to 400MHz under moderate load (like running Lightroom or Photoshop). It happened mostly when docked to my Ultra Dock, but occasionally when undocked, so I don't doubt there's a thermal design problem.

 

I called Lenovo twice and got disconnected each time.

 

However, FWIW, I found a solution that's been working great for me. I'm using ThrottleStop to reduce the CPU Core & CPU Cache by 120 mV and the iGPU (the integrated GPU, not the MX150) by 50mV. Lowering the voltage reduces the thermal load, and it's been working amazingly well. The risk of reducing the voltages of coures is errors in the CPU or GPU, but 120/50mV is working well. No crashes, and no throttling. ThrottleStop also has an "Alarm" mode which will switch the computer to a 'failsafe' setting, so I configured it to turn off Turbo Boost if the CPU hits 95C or the GPU hits 80C. I haven't hit either limit yet.

 

It's pathetic that we need to jump through these hoops, and I might call Lenovo to put pressure on them fix the underlying bad engineering, but for me using ThrottleStop to lower the CPU and iGPU voltage is working great.

 

Here are the instructions I followed:

 

https://www.notebookcheck.net/How-to-Lower-Temperatures-Stop-Throttling-and-Increase-Battery-Life-The-ThrottleStop-Guide-2017.213140.0.html

 

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100 Posts

08-25-2018

CN

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Re: T480 TDP throttle

2019-11-06, 21:28 PM

I've done that too, just that I can't undervolt my DGPU much if at all for games and 3D design as it causes the entire software to freeze or crash. 

 

With a repaste and the same setup as you, I still hit the TDP limit even with TPFANCONTROL. And plus I get a very unstable system too, hardly useful for an engineering student

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31 Posts

10-13-2015

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Re: T480 TDP throttle

2019-11-07, 0:17 AM

Reducing the CPU will have the biggest bang for the buck because the area of the CPU is much larger than the GPU and it's typically used more heavily. How much were you able to reduce the CPU voltage?

 

One other thought - under "Options" you can set up a Warning profile. On my system I set it to 'Disable Turbo'. Have you tried a setting a Warning profile? That might prevent the OS from stupidly reducing the frequency to 400 Mhz.

 

Unfortunately CPU power efficiency does vary, so your mileage may vary...

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4 Posts

12-04-2019

DE

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  • Message 35 of 51

Re: T480 TDP throttle

2019-12-04, 16:03 PM

I also had this issue with my T480 and MX150. But this behaviour only occurs then the notebook was in den dock (ultra dock). After several mails, phone calls and hardware replacements, lenovo released a BIOS update and a firmware update for the ultra dock. Now the notebook will never be run at 200/400 MHz.

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5 Posts

09-02-2019

PL

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  • Message 36 of 51

Re: T480 TDP throttle

2019-12-04, 17:19 PM

My T480 slows down to 400 MHz no matter if it is docked or not.

Can you share with the rest of us what is the version of T480 bios which you mentioned about? The same regarding docking station accordingly.

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100 Posts

08-25-2018

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Re: T480 TDP throttle

2019-12-05, 2:54 AM

I believe I have the latest bios installed. It's been nearly 2 years lenovo, really need to fix this NOW

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4 Posts

12-04-2019

DE

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  • Message 38 of 51

Re: T480 TDP throttle

2019-12-05, 6:55 AM

It works for me with the current versions:

- BIOS version 1.28

- Dock FW (Audio:0012,USB Hub:5033/5034,DP Hub:5.04.000,PD Control: D5.0.10.7) with ThinkPad Ultra Docking Station FW Utility v3.3.1 

 

For some weeks ago I got a new mainboard (with old BIOS) and so the problem was back again. After BIOS Upgrade it works.
During the problem was not solved for me, the workaround was to disable the mx150 in windows device manager (I don't need the graphic card during work hours). Maybe it was another problem, because it does not occur if the notebook was not in the dock and plugin with AC (on battery there was a throttling). 

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5 Posts

09-02-2019

PL

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  • Message 39 of 51

Re: T480 TDP throttle

2019-12-05, 7:33 AM

Thanks for details. I will check mine and see if throttling problem is fixed.

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31 Posts

10-13-2015

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  • Message 40 of 51

Re: T480 TDP throttle

2019-12-05, 19:50 PM

I'd though the throttling was over for me, but I was mistaken - it'd just a bit reduced.

 

When docked, the T480 frequently reduces its clock speed to about 1 GHz (instead of 400 MHz) even when the load is 100%, and even though the CPU and MX150 GPU are both below 60 degrees. Plugged in (ie not docked) the computer hums along at 3.6 GHz until the load gets heavy, then it reduces the clock speed, which is what I'd expect it to do. Seems like someting is over-agressively downclocking the CPU when docked.

 

I've got the latest dock firmware, the latest BIOS (per the post above), and for good measure I'm running ThrottleStop to try to reduce CPU voltage. No cigar. 

 

I've already contacted Lenovo support - they sent me a new dock (made no difference) and oddly a new screen (I have no idea why). Guess I'll get back in touch with them.

 

Seems like a premium laptop shouldn't have these problems...

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