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rpslee
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Posts: 10
Registered: ‎06-23-2017
Location: US
Views: 16,357
Message 1 of 142

Lenovo T470 (Core i5 7200u)- Slow performance on battery

Almost everytime I am on battery power, this laptop slows down to a crawl. Any suggestions?

 

Running Windows 10 Pro

Core i5 7200u

 

Things that I've tried:

1. Updating all drivers and BIOS

2. Turning off battery saver within BIOS

3. Setting the power options within windows 10, to have a minimum CPU performance of 50%

4. Setting cooling to Active on battery (just in case it was thermal throttling).

5. Updated to both the old and new version of Lenovo's Power Management Driver. 

 

The above still has my laptop running @ 0.38ghz and it doesn't increase with load (not sure why).

See screenshot:

Laptop_CPU_Speed.jpgPeformance Snapshot

pjc123
802.11n
Posts: 191
Registered: ‎07-31-2013
Location: US
Views: 16,308
Message 2 of 142

Re: Lenovo T470 (Core i5 7200u)- Slow performance on battery

I am not saying that this is cpu model related, but I just checked my T470 Win 10 Pro with an i5 7300u cpu, and it does not exhibit the issue you are experiencing.  On battery it goes as low as you indicated, but still goes up as high as 2.7GHz or so when needed (Tested with an Antivirus scan).  I did not have to mess with any Windows/Lenovo settings other than they were as stock, and have the most current BIOS, drivers and Win 10 updates.

 

You might want to make sure "Battery Stretch" is disabled in the Lenovo Settings App, as one of the things it does is decrease cpu speed, although I don't know by how much.

rpslee
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Registered: ‎06-23-2017
Location: US
Views: 16,295
Message 3 of 142

Re: Lenovo T470 (Core i5 7200u)- Slow performance on battery

Thanks - I'm starting to think that maybe IT provisioned me a lemon. 

 

Either that or Win 10 needs to be re-installed because some files are having a funky time controlling the CPU multipliers.

 

Might have Lenovo officially take a look at this.

rpslee
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Posts: 10
Registered: ‎06-23-2017
Location: US
Views: 16,267
Message 4 of 142

Re: Lenovo T470 (Core i5 7200u)- Slow performance on battery

Hey bud - could you let me know if your CPU speed gets throttled to 0.30+ ghz on battery and if that's still slow?

 

 

rodawg
Paper Tape
Posts: 7
Registered: ‎09-24-2015
Location: US
Views: 16,199
Message 5 of 142

Re: Lenovo T470 (Core i5 7200u)- Slow performance on battery

I am having this exact same problem.  Just got my new T470 a few days ago.  First time tonight using on battery.  No matter what I do, CPU runs at .35 GHz when not plugged in.

jhoh10
What's DOS?
Posts: 6
Registered: ‎08-14-2017
Location: US
Views: 16,124
Message 6 of 142

Re: Lenovo T470 (Core i5 7200u)- Slow performance on battery

I am also experiencing this same problem with my new T470. It is extremely frustrating.

 

Sorry about all the repeat posts, I can't figure out how to delete my older posts.

 

 

Moderator comment: Handled for you.

rpslee
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Posts: 10
Registered: ‎06-23-2017
Location: US
Views: 16,115
Message 7 of 142

Re: Lenovo T470 (Core i5 7200u)- Slow performance on battery

Can you all double check something?

 

Install Lenovo Settings in Windows 10 and report back the battery health?

 

Also, I have a feeling my laptop might do this when it's below a certain percentage of power. Can you also check if it throttles at 100% power? I know mine is inconsistent about it.

rodawg
Paper Tape
Posts: 7
Registered: ‎09-24-2015
Location: US
Views: 16,144
Message 8 of 142

Re: Lenovo T470 (Core i5 7200u)- Slow performance on battery

SUMMARY:

- I have done extensive testing and have isolated the problem.

- I found a workaround.

- It is clear this is a Lenovo problem that they need to address.

- I'm considering sending mine back and getting another model (i7 vs. i5, T570 vs T470, etc.); however, I'm not confident other machines of this same generation won't exhibit the same problems--ANYONE have any insight into this?

 

- Turns out the version of BIOS affects this problem.  Versions 1.30 and greater do not exhibit this problem.

- However, version 1.30 brings another problem--the M.2 NGFF SSD hard drive I installed internally stops being recognized by the system starting with the same version!

- I fully tested all available BIOS versions including 1.23, 1.25, 1.28, 1.29, 1.30, 1.31, 1.32 (latest).  I was able to confirm the above, specifically, all versions 1.29 an below suffer from the "CPU throttle stuck" issue and all versions 1.30 and above suffer from the "M.2 NGFF SSD not visible by system" problem.

- It would seem engineers found some sort of problem that makes fast CPU on battery and the inclusion of the M.2 SSD mutally exclusive.  Perhaps some sort of cooling issue, like requiring fan, but that would impact battery life.

 

WORKAROUND:

I found a program called "ThrottleStop" that allows one to manipulate various CPU settings.  It turns out if one disables "BD PROCHOT" the problem instantly goes away.  This of course is until next reboot.

 

jhoh10
What's DOS?
Posts: 6
Registered: ‎08-14-2017
Location: US
Views: 16,144
Message 9 of 142

Re: Lenovo T470 (Core i5 7200u)- Slow performance on battery

My problem was resolved by updating the bios to version 1.32.

rpslee
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Posts: 10
Registered: ‎06-23-2017
Location: US
Views: 16,126
Message 10 of 142

Re: Lenovo T470 (Core i5 7200u)- Slow performance on battery

Did you get the latest bios? or was it a particular version?

 

Also do you have the 20HD model?

 

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