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55 Posts

05-24-2011

New York City

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Re: X220 cpu throttling problem

2011-06-03, 16:16 PM
ok, here is how I think the test should be conducted...

First, leave only the computer on battery alone, no ultrabase or slice battery or anything else, just the battery. This is to avoid disrupting the power before performing the test.

Next, shutdown the laptop, wait 2-3min, and turn on the laptop.

After your laptop is ready to be used, first make sure power manager settings for ac power is in max performance/max turbo. Now plug in the 65w ac adapter. Open hwinfo32 plus sensors window.

Next, run occt gpu test for a period of 15min or until you get perma throttle to 800mhz cpu and 650mhz gpu, whichever comes first. If you dont get perma throttle in those 15min, add prime95 torture test while occt continues running. Do this for about 10min. If you throttled to 2700mhz cpu, this is fine.

If no perma throttle to 800mhz after this test, you can say you dont have this issue.

Good luck.
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213 Posts

12-06-2007

United States of America

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Re: X220 cpu throttling problem

2011-06-03, 17:53 PM

I've PM'd a couple of you looking for some info. Please check your mail.

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78 Posts

05-15-2011

USA

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Re: X220 cpu throttling problem

2011-06-04, 2:38 AM

Thanks Ken--I've sent a reply back.  I appreciate you guys working so diligently to correct this. :-)

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

05-13-2011

United States

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Re: X220 cpu throttling problem

2011-06-04, 19:04 PM
Finally got to test mine, here's what I found:
Using 65W adapter, plugged in, I saw no semi-perma throttling. It constantly dips down to 800mhz and comes back up after a few seconds. The GPU clock, however, stays at 650mhz almost the entire time, occasionally jumping up higher.
After 25mins of OCCT, i added wPrime for 10 minutes - still no perma throttling.
After that, I closed wPrime and left OCCT running and unplugged the machine - the GPU shot up to 1300mhz and stayed above 1000mhz almost the entire time on battery, and the cpu stopped cycling down to 800mhz.

So, while I'm not seeing the perma-throttling the rest of you are seeing, it does appear there is still something going on when plugged in that shouldn't be. Hope someone finds this helpful...
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55 Posts

05-24-2011

New York City

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Re: X220 cpu throttling problem

2011-06-05, 3:53 AM

Here is an update to this issue...I  found this by mistake.

 

Today I had my computer display output to my hdtv. I was streaming hd video through slingbox through the browser player for about 1 and 1/2 hrs with ac plugged. I was also running hwinfo to see if there was any throttling while doing this but there was none.

 

After, I decided to run the occt test and got no throttling, not even after adding prime95 to the mix. Then decided to shutdown, power on and try again, still got no throttling. Did the same shutdown/power on/run test one more time and again got no throttling. At the end, I noticed that the brightness was at 7 which is the setting for battery, on ac I have it set at 12 so during all these test it was at 7.

 

For the next test,  I changed the brightness to 12 and boom, perma thottle in 6min running occt. Then I shutdown/power on/ran test again, this time I set the brightness at 7, ran test for 12min and got no throttle, then after the 12min mark, I changed the brightness to 13 and started getting the occasional drops, play this game of brightness up/down for about 3min and everytime I set the brightness higher, it will start the occasional drops, if brightness lower, no throttle.

 

Did one last test and after 13min of running occt with the brightness set to 13 and did not get the perma throttle, then ran prime95 and neither got the perma throttle, only occasional drops. But with brightness at 7, it never drops under stock 2700, not once when running occt and prime95 together. So at the moment I'm getting the perma throttle sometimes and not at all times as before. Maybe this cpu/gpu needs a break in period like TVs...lol.

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40 Posts

05-25-2011

Davis, CA

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Re: X220 cpu throttling problem

2011-06-05, 4:13 AM

Higher brightness means more power draw from the monitor.. seeing how the monitor is connected directly to the motherboard (and draws its power from there too).. maybe this increased power draw is the issue..?

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56 Posts

05-12-2011

USA

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Re: X220 cpu throttling problem

2011-06-05, 4:43 AM

wrote:

Higher brightness means more power draw from the monitor.. seeing how the monitor is connected directly to the motherboard (and draws its power from there too).. maybe this increased power draw is the issue..?


Yeah, My guess is that it is related to total power draw from the 65watt adapter somehow.  Too bad the 90watt slim adapter causes an unstable touchpad.  Still, when I think about these issues, Its amazing how lenovo didnt discover all this in their own testing.

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55 Posts

05-24-2011

New York City

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Re: X220 cpu throttling problem

2011-06-05, 19:01 PM

wrote:

wrote:

Higher brightness means more power draw from the monitor.. seeing how the monitor is connected directly to the motherboard (and draws its power from there too).. maybe this increased power draw is the issue..?


Yeah, My guess is that it is related to total power draw from the 65watt adapter somehow.  Too bad the 90watt slim adapter causes an unstable touchpad.  Still, when I think about these issues, Its amazing how lenovo didnt discover all this in their own testing.


 

Yeah, most probably is the power draw issue. UPDATE ON MORE TESTING... Today, I performed the test twice with my default brightness 12 on ac power and couldn't get the perma throttle neither with occt alone or with occt and prime95 together. It did drop a few times, but always went back up. It only happened once yesterday during my testing. At the moment, I guess my computer seems to be getting the perma throttle sometimes. Then I updated to latest bios 1.16 to help with the fan noise, then performed the test again and no throttling either. Well, it's good that at least I'm only getting it sometimes, before I used to get it every time I ran the test after turning on the laptop.
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40 Posts

05-25-2011

Davis, CA

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Re: X220 cpu throttling problem

2011-06-06, 0:36 AM

It might not even have to do with the total power draw from the 65W adapter, but merely the output characteristics of the 65W adapter, coupled with the misc voltage regulators inside the laptop. (Note: I'm definitely not in electrical engineering, so these are just wild guesses.) Maybe theres a certain voltage junction on the motherboard that is getting overloaded by the power draw of certain uses (as in, the 65W adapter provides enough power, but there are bottlenecks within the motherboard itself).

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78 Posts

05-31-2011

Germany

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Re: X220 cpu throttling problem

2011-06-06, 17:56 PM
Which of your machines did you test? i5 or i7?
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