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213 Posts

12-06-2007

United States of America

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Re: X220 CPU throttling problem

2011-06-02, 12:52 PM

Likely a BIOS update.

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78 Posts

05-15-2011

USA

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Re: X220 CPU throttling problem

2011-06-02, 14:22 PM

Thank you for the continued communication, Ken.  It makes all the difference to those of us especially who are selling these units to our customers! :-)

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

05-31-2011

EU

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Re: X220 CPU throttling problem

2011-06-02, 17:43 PM

Hello, I also experienced the CPU locking at 800 Mhz in my X220 i5-2540M. A short unplugging of the AC adaptor helped. Would be good to get a fix on this issue.

 

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84 Posts

10-15-2008

Edmonton, Alberta, Canada

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Re: X220 CPU throttling problem

2011-06-02, 17:44 PM

I know Ive mentioned this before, but has anyone seen this occur in alternative Os's such as linux?

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19 Posts

05-21-2011

USA

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Re: X220 cpu throttling problem

2011-06-03, 3:04 AM

I just ran the test from:

http://digitalchumps.com/featured-electronics/132-features/7455-lenovo-x220-i7-2620m-cpugpu-throttling-the-full-details-and-breakdown.html

 

With the 6--cell battery alone, both cores bounce around between 2.6 and 2.5 Ghz.

 

With the battery and 65W adapter connected, it does the same high-level variation in speed, but then drops to 797 Mhz every 5-7 seconds, staying throttled for about 5 seconds each time. 

 

After 10 minutes, it was still doing the same.  It never got stuck at the lower speed.

 

Now, something interesting:

 

I tried powering it through the Ultrabase. (Power cord plugged into Ultrabase, X220 docked.  It no longer throttles, and the bouncing range is hither, almost always abouve 3.1 Ghz, rarely dropping below 3..0

 

And, shortly after docking it, there was a pop-up that said some Intel power management utility had been installed,  (I couldn't write the details down in time). 

My installed programs list doesn't show it though, and it does not appear as a service.

 

I then undocked the machine, connected directly to the power supply, and .. No more throttling.

 

Trying a shutdown / restart, undocked, but on AC power..

 

Now it's throttling again.  Putting it back on the Ultrabase..

 

No software install pop-up this time, and it's still throttling. 

 

Disconnected power adapter, plugged it back into the Ultrabase again, started OCCT, and now it's NOT throttling.

 

I made an adapter so I could power the X220 from a bench power supply (19V max output)  I slowly lowered the voltage to 12V, where it finally reverted to battery power.  Throughout this drop, the speed held steady, never dropping into green, never throttling.

 

So, whatever the issue with the 65W adapter is, it's not low output.

 

I measured the adapter's output under load, and it holds at about 20.2V 

 

During this testing, it stopped throttling,  I had to do a shutdown / reboot to get it to start throttling again. 

 

Confused..

 

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32 Posts

06-03-2011

UK

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Re: X220 cpu throttling problem

2011-06-03, 10:12 AM



Hi all,

 

Glad to hear that there is a fix being crafted.

Just wanted to repost my findings on this issue over here (posted on forum.notebookpreview.com first):

 

Tested using OCCT and watching HWiNFO32 at the same time. Using Maximum Performance preset set to default settings. X220 i7, 80GB Intel 310, 320GB Hitachi 7200RPM, 8GB RAM, Intel 6205, Bluetooth, fingerprint reader, IPS, 6-cell, just updated to 1.16 BIOS.

65Watt PSU

Throttling to 800/650MHz (CPU/GPU) happens almost instantly as soon as the GPU goes for 1300MHz turbo. Seems to recover after about 10 seconds, CPU goes into turbo and shortly after the GPU tries to ramp up with 800/650 throttling being the result. This just keeps on going. Haven't seen it perma-throttle yet.

One interesting observation: When lowering the screen brightness from its default 15 to 0, both CPU and GPU are able to keep the 3200/1300 up for about 5 seconds before the above mentioned effect kicks in.



90Watt PSU (came with docking station, plugged in directly)
System starts of at 3200/1300 and then slowly (over a period of maybe 10 minutes) slows down to 2700/1250 (the GPU actually jumps between 1250 and 1300). CPU temps reach about 84 Celsius. This behavior seems acceptable to me.

No PSU connected
Couldn't find the same throttling as with the PSUs, but here the frequencies seem all over the place. Not so much the CPU, seems to be jumping anywhere between 2700 and 3200, but more so the GPU, jumping between all available states in the range of 650 to 1300, staying closer to 1200 for the most part.

 

Thanks for keeping us updated.

Gundy 

 

X220 4286 CTO, i7-2620M, 8GB RAM (2x4), 320GB HDD+Intel mSATA 80 GB, IPS display, BT 3.0, Intel 6205 WiFi, Finger Print Reader, Win7 Pro 64
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55 Posts

05-24-2011

New York City

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Re: X220 cpu throttling problem

2011-06-03, 11:35 AM

For how long are you guys running the test for? I suggest you run ooct for 15-20min to be sure the perma throttle does not exist on your machine. On mine, sometimes it takes just over 10min. Also, try running a cpu stress test like prime95 while occt is running to see what happens. If you dont get the perma throttle then thats great, but for many of us, we get it everytime we try to replicate the issue so a fix will be good for everyone.



By the way, now Im having the screen flicker issue with the refresh rate switching to 50hz when on battery. Tried the intel driver, windows monitor setting and have to never decrease refresh rate in power options, but still wont stop this from happening.
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78 Posts

05-15-2011

USA

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Re: X220 cpu throttling problem

2011-06-03, 12:59 PM

Yep, I'm quite sure at least three issues exist on ALL i7 configuration X220s anyway:

 

  1. The CPU throttling issue,
  2. The touchpad jumpiness when the 90W UltraSlim adapter is attached (which I believe to be related), and
  3. The 50Hz refresh rate switching issue.

The last one seems to crop up after several days of use, which is strange.  Once it occurs, I have found no way to prevent it.  I have gone through some pretty in-depth troubleshooting but have had no luck in tracking down a culprit.

 

The final issue that I advise all owners to watch for is one of random hibernations.  It doesn't happen often, but twice already I have experienced a problem where my X220 has entered hibernation, citing "critical battery", when in fact it has something close to 70% or so remaining.  It appears to be arbitrary, and it may also be related to these other power issues we've all been experiencing.

 

I certainly hope this is all corrected via software-based means.

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

05-24-2011

New York City

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Re: X220 cpu throttling problem

2011-06-03, 13:55 PM

I have experienced 2 of those 3 issues reported by othersteve in just 5 days with the machine. I didnt know the refresh rate issue was only on the i7s? Is it? Also, is the 90w, the slim adapter, the only one causing the touchpad problems? The regular lenovo 90w adapter does not cause the problem? I thought it was all of them.

I still have the i5 2520m (w/ 6 cell battery) machine that I was thinking in returning in the box unopened (to avoid restocking fees), but after all these issues I think it's best to open it and test it for these same issues and see how it compares. Then it will be decision time of which to keep. Ill be doing the testing on the i5 most probably tomorrow. Ill keep you guys updated and maybe you help me in making the final decision of keeping the i5 or the i7.

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78 Posts

05-15-2011

USA

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Re: X220 cpu throttling problem

2011-06-03, 14:09 PM

Hey mellospace--

 

Oh--I didn't mean to insinuate that only the i7s were experiencing all of these problems.  It makes sense that all models would have the refresh rate switching issue, and it's likely software-based.  The other two seem possibly related to the processor's increased power demands under load (although TDP does not indicate this).

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