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12010 Posts

09-04-2014

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Re: Thinkpad A485 - Bios 1.05 worsens throttling further

2018-12-03, 9:14 AM

Hello All,


Engineering are looking into this, investigation is ongoing, but have also recommended the same as claurie suggested in another thread; loading default settings in BIOS would appear to mitigate most performance degradation.

Please remember to make a note of any changes you may have made in BIOS before selecting default values, you will need to make thos changes again afterwards.

 

Andy

 

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20 Posts

09-19-2018

United States of America

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Re: Thinkpad A485 - Bios 1.05 worsens throttling further

2018-12-03, 20:50 PM

Finally! Thanks for the update, Andy. It was relieving that Lenovo at least does something on the problem. Keep us posted if you can about new BIOS release which should fix that. Also, as we are on this page, can TDP be configurable for this laptop, so it can unveild whole 15W TDP for Ryzen(even if it voids the warranty). Some of us work on a dock station, so temperature is not an issue. 

 

Thanks, I am still looking for buying this laptop.

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17 Posts

10-05-2018

United States of America

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Re: Thinkpad A485 - Bios 1.05 worsens throttling further

2018-12-04, 0:51 AM

Andy,

 

thanks for the response letting us know that engineering is investigating the issue. As a result of either the 1.11 BIOS or from loading the setup defaults as recommended, it seems as though my CPU frequencies are much more stable, but only when doing something which makes heavy use of all 4 CPU cores. When performing a task that uses only one CPU core, or which involves the GPU, the CPU frequencies still jump wildly around. Performance even in the multi-core case is also still lackluster, but I'll wait to see what Lenovo has to say after looking into the problem.

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20 Posts

10-11-2018

United Kingdom of Great Britain and Northern Ireland

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Re: Thinkpad A485 - Bios 1.05 worsens throttling further

2018-12-06, 10:02 AM

We have prove now that it's completely and 100% fixable via changing the STAPM values, which a bunch of different Ryzen 5 users have done on r/overclocking and r/amd over on Reddit, achieving a full 35W TDP allowing for constant 3.4ghz boost and 1100mhz iGPU boost without power throttling. As long as Lenovo hasn't legitimately put a 70 degree hard thermal lock, it's looking likely that we might actually finally get the most out of our purchases, even if we have to software like tpfancontrol to force fan speeds about how they're preconfigured when playing.

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09-19-2018

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Re: Thinkpad A485 - Bios 1.05 worsens throttling further

2018-12-06, 10:11 AM

35W TDP, are you sure? This chip has max of 15W.

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10-11-2018

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Re: Thinkpad A485 - Bios 1.05 worsens throttling further

2018-12-06, 10:41 AM

It actually doesn't, even on the A485 it reaches 25W (you have to use uProf to get accurate results) and it's already been proven.

 

Here's a link for you

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09-19-2018

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Re: Thinkpad A485 - Bios 1.05 worsens throttling further

2018-12-15, 12:07 PM

Guys, can someone with A485 try the solution for the throttling problem above?

It should be relatevely easy with Ubuntu, just do

 

sudo apt-get install acpica-tools

sudo cat /sys/firmware/acpi/tables/DSDT > dsdt.dat

 

Then change the related values, and compile and upload the DSDT.

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19 Posts

12-15-2018

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Re: Thinkpad A485 - Bios 1.05 worsens throttling further

2018-12-18, 20:50 PM

I have an A485 for work with a ryzen 2700u pro and an ideapad 330s with a 2700u. The A485 never clocks higher than 2.6ghz on all cores where as the 330s will clock at 3ghz on all cores for the first run then throttles. I get 650 cinebench for the 330s and a measly 534 on the A485. I used amds uprof to monitors stats. The temp of the 330s on all cores is about 70c and the A485 stays around 68c and the fan barely runs on the A485 even in performance mode. I checked and the configurable tdp STAPM for the 330s is 15 watts and the A485 is 22 watts in performance mode and 15 watts in quiet mode. I think the A485 is being held back because the fan is not running hard enough during performance mode and throttling at 70c. The more expesnsive A485 should be getting better performance than the cheaper 330s because the CTDP is configured higher and yet it performs worse. Lenovo please fix this!!!!

 

I edited the STAPM on the 330s and edited the the CTDP to 25w which is the max that it can support. I get 3GHz on all cores every run and no throttling at all. Since the STPM is 22w on the A485 I do not beleive changing this will result in any performance gain.

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09-19-2018

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Re: Thinkpad A485 - Bios 1.05 worsens throttling further

2018-12-18, 20:57 PM

Thanks for the effort. So basically the DSDT method works and helped your 330s, but not A485? Am I understanding you correctly. Can you paste here, or on `pastebin.com` the relevant parts of your DSDT tables? Maybe there is some difference that prevents A485 from change.

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12-15-2018

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Re: Thinkpad A485 - Bios 1.05 worsens throttling further

2018-12-18, 21:08 PM

I did not edit the DSDT for the A485 it is my work computer so I do not feel comfortable doing that. But yes I did it on my personal ideapad 330s and it now does not throttle. I did extract the DSDT for the A485 and examined it. It looks very similar to the 330s except it is set to 22w. I do not believe the 3w will make much difference. I am curious and want to try to force more air through the laptop vent to simulate the fan running harder and see if it makes a difference.

 

Also as far as editing the DSDT I got my info from a similar post for the 330s. https://forums.lenovo.com/t5/Lenovo-IdeaPad-1xx-3xx-5xx-7xx/Ideapad-330-Ryzen-5-2500u-underperforming/td-p/4229974

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