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236 Posts

05-09-2010

Cochrane

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Re: X220 cpu throttling problem

2011-05-29, 21:15 PM

Thanks for testing that out.  I'll send the guy that started this thread a PM to let him know that using ThrottleStop can help solve this problem.  Maybe he can post a link to ThrottleStop in his first post so other users can give this a try.  It's helped the new Sandy Bridge HP and Asus laptops so I'm not surprised that it is working on the Lenovo too.

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46 Posts

05-21-2011

UK

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Re: X220 cpu throttling problem

2011-05-30, 7:54 AM

I've found ThrottleStop can sort of help, but not really - at least in my own tests.

 

Specifically, using it does seem to limit the throttling of the CPU, but unfortnuately with ThrottleSotp enabled (and the "multiplier locked" setting enabled), the GPU never seems to go above 650mhz (unless you take it off AC and use battery instead - weird). So, when using AC power (WITH battery in at the same time), the net impact when using throttlestop is the same as not using it - ie while the CPU is not throttled, the GPU turboboost never kicks to get it above 650mhz.

 

In practical terms, I found that whether or not I used throttle stop, the fps when using OCCT was consistent at about 13.5fps. In contrast, when I use the battery (of course set to Maximum Performance), the fps jumps to about 24-26fps (with or without throttlestop being used).

 

This shows the impact of the CPU throttling OR what hapens if the GPU clock doesn't throttle UP above 650mhz.

 

Hope this makes sense...

 

Petrov.

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2 Posts

05-30-2011

Uk

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Re: X220 cpu throttling problem

2011-05-30, 12:27 PM
I was just about to place my order for the x220 when I discovered on the web that there could be some issues.

I am trying to ascertain how much of an issue these issues will really be for me (I don't play games on my laptop).

So regarding throttling I need some help. I have installed CPU-Z on a Dell vostro 1320 with core 2 duo T8300 2.4ghz CPU. Looking at CPU-Z i see that the CPU is running primarily at 798mhz with some increases and jumps up to 2230ghz but overall most of the time on 798mhz. I don't think I a. Running anything to heavy, the only application which sometimes causes my computer to pause for a bit is Lotus Notes.

So my question, if this hasn't bothered me too much until today because I did not know about it, will it bother me on the x220?

Any opinions?

The other two issues I have read about are maybe more of a concern, that is high pitch fan noise and wake up from suspend problems when a wwan card is installed. Te Dell is a quiet machine so a high pitch fan would probably bother me.

Thank you for your help.
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2 Posts

05-30-2011

Uk

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Re: X220 cpu throttling problem

2011-05-30, 13:12 PM

Having done some more testing on my Dell Vostro, I now understand that it remains at 798 MHz when it's not being tasked much, but if for example I play a video on You Tube it goes full speed to nearly 2400 MHz.

 

So If I understand correcty, the X220 is not going full speed even when needed. Is that right?

 

 

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46 Posts

05-21-2011

UK

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Re: X220 cpu throttling problem

2011-05-30, 13:53 PM

economyman - yes, thats correct.

 

Also, I've just installed my second game - Dragon Age: Origins - and this creates the throttling as well. Played for about half an hour, quit the game, and the system had perma-throttled to 800mhz. that's a 100% success rate on two games I play - neither of which you'd describe as "cutting edge" graphically (Civ 5 and DA:O).

 

Petrov.

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8095 Posts

11-19-2007

United States of America

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Re: X220 cpu throttling problem

2011-05-30, 14:11 PM

Petrov, All,

 

Apologies if this was already covered upthread...

 

Assuming you are doing your testing with battery in and AC connected, could you try unplugging and then replugging the AC adapter while the system is running and throttling is being exhibited,  to see if the symptom is cleared?

 

Our engineering team is doing testing and believe they are seeing some of the same symptoms reported here, but want to ensure we looking at the same thing.    If you can confirm, that will be a big help.

 

Mark

 

 

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46 Posts

05-21-2011

UK

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Re: X220 cpu throttling problem

2011-05-30, 15:26 PM

Mark, thanks for posting us, much appreciated.  You are correct on a few counts which have been confirmed on this thread or others (see in particular the notebookreview forums), but to summarise in any case, the throttling occurs:

 

1. with AC and battery in at the same time

2. Can be "reset" with a cold reboot or removing the AC plug and replugging it (as you say)

3. Is far less pronounced (almost nonexistent) when run in battery mode (ie no AC plugged in) at max performance setting in lenovo power manager

4. is widely replicable, not just using stress tests like OCCT or 3dmark06, but also at least the two games i've installed (civ 5 and Dragon Age: Origins)

5. when CPU can be at relatively low temps (<60 or even 50C!)

6. when the GPU boosts above 650mhz

 

Conventional wisdom is that it's power related given it seems to be less of an issue when on battery and not related at all to CPU temps.

 

I hope your guys can isolate and fix the issue! Also, please don't "fix" the issue just by disabling GPU turboboost, as that is a fundamental feature of SandyBridge/HD3000 (I'm sure you wouldn't....?)!!

 

Thanks again,

Petrov.

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56 Posts

05-12-2011

USA

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Re: X220 cpu throttling problem

2011-05-30, 17:31 PM

wrote:

Petrov, All,

 

Apologies if this was already covered upthread...

 

Assuming you are doing your testing with battery in and AC connected, could you try unplugging and then replugging the AC adapter while the system is running and throttling is being exhibited,  to see if the symptom is cleared?

 

Our engineering team is doing testing and believe they are seeing some of the same symptoms reported here, but want to ensure we looking at the same thing.    If you can confirm, that will be a big help.

 

Mark

 

 


Mark,

 

I want to make a HUGE point here, the throttling issue I'm seeing is definitly related to the 65watt adapter.  Let me explain a little more.

 

OK, so I run a GPU and CPU stress test.  Using HWinfo32, I can see the CPU wattage being used, with both GPU and CPU, the watts go almost instantly to 42watts, after a few seconds, the cpu will throttle itself down, to reach the maximum TDP, which is 35watts.  This will happen regardless of any system temperature, the cpu is rated to 35watts, maximum.

 

This is where it gets interesting.  On a 65watt adapter, the system, under super-maximum cpu and gpu load, when it touches the initial 42watt moment, will throttle down to 800mhz/650mhz, BELOW the 35watt rated maximum.

 

If test on battery alone, you will be able to hit the 35watt maximum at the highest rated speed (non turbo) 2.7ghz/650mhz.

 

If you use a 90watt adapter, you will see similar results to those on battery, your cpu will land on 35watts of power draw, and the clock speed will hover right above 2.7ghz./650mhz.

 

As a possibily related note: the 90watt ultraslim adapter also causes a jumpy touchpad, if the system is under no load.  Under heavy load, the jumpy touchpad goes away with the 90watt adapter.

 

 

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78 Posts

05-15-2011

USA

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Re: X220 cpu throttling problem

2011-05-30, 17:48 PM

wrote:

 

As a possibily related note: the 90watt ultraslim adapter also causes a jumpy touchpad, if the system is under no load.  Under heavy load, the jumpy touchpad goes away with the 90watt adapter.

 

 



I just wanted to emphasize this part of the post, as I believe this is being overlooked to some extent, and it seems quite likely to be directly related to the same exact issue at hand--which appears to be some sort of problematic power management within the system as a whole (IMO).

 

So it isn't just the 65W adapter which is causing problems here; it seems more likel that, for whatever reason, the laptop does not seem to want to handle varying amounts of power under certain circumstances.

Owner/Technology Specialist
Triple-S Computers - http://www.TripleSComputers.com
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56 Posts

05-12-2011

USA

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Re: X220 cpu throttling problem

2011-05-30, 18:02 PM

wrote:

wrote:

 

As a possibily related note: the 90watt ultraslim adapter also causes a jumpy touchpad, if the system is under no load.  Under heavy load, the jumpy touchpad goes away with the 90watt adapter.

 

 



I just wanted to emphasize this part of the post, as I believe this is being overlooked to some extent, and it seems quite likely to be directly related to the same exact issue at hand--which appears to be some sort of problematic power management within the system as a whole (IMO).

 

So it isn't just the 65W adapter which is causing problems here; it seems more likel that, for whatever reason, the laptop does not seem to want to handle varying amounts of power under certain circumstances.


Yeah, under super heavy load, I'd like to see a more even distrubution of maximum power to the gpu.

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