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55 Posts

05-24-2011

New York City

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Re: X220 cpu throttling problem

2011-06-06, 19:18 PM
Still testing on the i7. Have not done anything with the i5 yet.
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21 Posts

05-31-2011

EU

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Re: X220 cpu throttling problem

2011-06-06, 19:44 PM

I'm also experiencing the throttling again when I charge the battery. Unplugging and reconnecting didn't help this time. Also, when I connect the adaptor to the plug the screen will blacken for a short time and then the windows are realigning. This is strange. Does anybody experience this behavior?

 

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55 Posts

05-24-2011

New York City

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Re: X220 cpu throttling problem

2011-06-06, 20:25 PM

The screen flashes when you plug/unplug the ac power is another issue where the refresh rate drops to 50hz on battery and goes up to 60hz when on ac power. Google "x220 refresh rate 50hz" and you will find the thread about this issue. Supposedly, the problem is with the intel hd 3000 graphics. There is a fix in the thread where you stopped a program from running on startup.

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12951 Posts

06-06-2011

Russian Federation

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Re: X220 cpu throttling problem

2011-06-06, 22:00 PM

I've got the i5-2520 based device, tested it and there is nothing throttling problem. Except of the low frequencies of CPU/GPU in OCCT stress test with AC adapter pluged in only (w/o battery). In that test the fps was about 13 - 16 fps. It's a feature? Nevertheless, it's not a problem for me as I don't use the laptop w/o battery.



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5 Posts

06-08-2011

Toronto, Canada

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Re: X220 cpu throttling problem

2011-06-08, 1:38 AM
Just purchased x220 with i5 processor couple of weeks ago. Was noticing that when adapter is plugged in I have major issues with the mouse pointer. Movement becomes very jumpy and seems to stop/start when I try to move it around. Doesn't happen when only battery used. Seems that this may be related to the same throttling issues identified here. For the record I use the 90W ultraslim adapter and still see the same problems.
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46 Posts

05-21-2011

UK

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Re: X220 cpu throttling problem

2011-06-09, 7:46 AM
Ken and team - any update on treatment of the throttling issue?

Many thanks as always.

Petrov.
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55 Posts

05-24-2011

New York City

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Re: X220 cpu throttling problem

2011-06-09, 13:22 PM
Ok guys, here is an update on more testing...  

I ran wprime 1024M test 3 times back to back which took close to 30min, no throttling experienced and the highest core temp at end of testing was core 0/core 1 = 92/93. My ambient temperature was about 28 degrees celsius. Each test lasted about 558 seconds. All completed successfully.  

Then back to testing with occt gpu test…  

I continue testing my i7 laptop and again only getting the perma throttle sometimes. One thing really odd that happened during the testing, at one point I got perma throttle like 3-4 times back to back while running occt gpu test and  even after unpluggin and plugging the ac power, if I try the test again, I got perma throttle. Not the same as before where after the first unplug/replug, I wouldn’t get the perma throttle anymore. Then I went and unplug the ac power from the ac box (rectangular box with the lenovo sign and the power adapter label) and plug it back in but in the opposite way, don’t think that makes any difference but I tried that. I’m talking about the plug that has the two holes (the one that goes from the laptop to the ac box) where the two pins from the box plug into. Then performed the test like 5 times back to back and no more throttling. Performed a test again this morning and again no throttling. Don’t know if it was just a coincidence or what, but it’s weird. All my occt test ran for at least 1000sec = 16 minutes. During all these tests, highest core temperature was 93.  

About the i5 2520m…  

I performed the test in the i5 also and did not get the perma throttle. While running occt gpu test, it will occasionally throttle to stock 2500 and nothing less. Then I added prime95 and it throttled to 797 occasionally, but it will go back to 2500. Never got the perma throttle. Except that my temperature started getting pretty high while testing and after a few minutes, got the thermal “throttling” which is normal I guess. Then after I stopped prime95, it was fine again.  

On the i5 2520m laptop, I also experienced the 50hz refresh rate switching while on battery (unplugging ac power). Same issue as my i7 laptop.  

For some reason, the touchpad on the i5 was easier to use and it feels very smooth on my fingers when using it. The touchpad on my i7 feels rough, like I need to press harder to click and to move. Even the touchpad surface on the i7 feels rough compare to the one on the i5 (I’m thinking about sending mine for a touchpad replacement). The i5 also feels pretty smooth and fast when performing tasks. The only drawback I saw on the i5 was the screen light bleed, it was very noticeable, close to some that I’ve seen reported here. On my i7, you barely see the screen light bleeding, it’s very minimal. Also, on the i5 and the i7 on the same brightness setting, it appears to my eyes that it looks brighter on the i5.  

Also, I tried the 6 cell battery on the i7 and fits a lot tighter than my 9 cell. It barely moves and only if you try to move it to see if it moves. On my i7, the 9 cell has some noticeable play even when on my lap or when I pick it up I can feel the battery moving.

Well, that’s all for now. Let’s hope we get some updates on these issues from Lenovo. Just hoping.
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213 Posts

12-06-2007

United States of America

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Re: X220 cpu throttling problem

2011-06-09, 21:41 PM

 

I haven't forgotten about you guys. The BIOS is still under test. I'll talk to the engineer and come back.

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2 Posts

06-10-2011

Thailand

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Re: X220 cpu throttling problem

2011-06-10, 4:11 AM

Please hurry up. We buy x220 to use not for fix problem.

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21 Posts

05-31-2011

EU

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Re: X220 cpu throttling problem

2011-06-11, 11:44 AM

 


wrote:

 

I haven't forgotten about you guys. The BIOS is still under test. I'll talk to the engineer and come back.


Great! Hope this will get fixed, as the X220 works perfectly otherwise. It's really a good machine.

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