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34 Posts

02-19-2014

Nederland

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-03-13, 10:03 AM

Hi NINE,

 

I'm not sure if EM is a solution to the problem. This is what I did:

 

Notebook was turned off. Unplugged it after a night on the charger. Booted to Windows and CPU is stuck @ 800 MHz.

Plug and unplug power, CPU throttles up.

 

Then I uninstalled EM and the drivers (so no ACPI device and utility installed) and tried again.

Notebook was turned off. Booted to Windows on battery and CPU is stuck @ 800 MHz.

Plug and unplug power, CPU throttles up.

 

What I know for sure now is:

I can preproduce the issues every time booting to Windows on battery.

Plug and unplug the battery or reboot the notebook solves the problem.

I use CPU-z to moinitor the CPU speed and Winrar's benchmark option to speed up the CPU.

 

Hope it helps.

 

Cheers.

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50 Posts

01-30-2014

Hungary

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  • Message 32 of 419

Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-03-13, 12:40 PM

Hi!

I think it is just a coincidence that we experiencing the plug/unplug thingy after the updated EM has been installed.

Most likely the Z510 was behaved the same before the update.

When you reinstall any Windows version (e.g. Windows 7) without installing any driver on it, you can still experience the problem so a simple driver update could not solve the issue.

Please take a look at the Helix thread about the same problem (according to the last post, it is still unresolved ):

http://forums.lenovo.com/t5/X-Series-Tablet-ThinkPad-Laptops/Re-helix-CPU-speed-stuck-at-low-clock-speed/td-p/1175277/page/24

And please also look at this too:

http://superuser.com/questions/504249/windows-8-after-sleep-shutdown-multiplier-down

It is a Dell machine with Windows 8 and without any driver installed on it.

And how about Asus UX32VD?:

http://forum.notebookreview.com/asus/729577-ux32vd-cpu-stuck-0-77-ghz-ac-power.html

http://hardware.forumsee.com/a/m/s/p12-38095-0207763--ux32vd-cpu-stuck-ghz-power.html

There was even Ubuntu installed on the last one but the owner experienced the same thing.

So, as I wrote in my initial post this is something big.
Maybe Intel and Microsoft should be involved to solve this.

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8 Posts

03-06-2014

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  • Message 33 of 419

Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-03-13, 21:02 PM

wrote:

Hi NINE,

 

I'm not sure if EM is a solution to the problem. This is what I did:

 

@Notebook was turned off. Unplugged it after a night on the charger. Booted to Windows and CPU is stuck @ 800 MHz.

Plug and unplug power, CPU throttles up.

 

Then I uninstalled EM and the drivers (so no ACPI device and utility installed) and tried again.

@Notebook was turned off. Booted to Windows on battery and CPU is stuck @ 800 MHz.

Plug and unplug power, CPU throttles up.

 

What I know for sure now is:

I can preproduce the issues every time booting to Windows on battery.

Plug and unplug the battery or reboot the notebook solves the problem.

I use CPU-z to moinitor the CPU speed and Winrar's benchmark option to speed up the CPU.

 

Hope it helps.

 

Cheers.


exactly same here. 

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8 Posts

10-28-2013

Romania

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  • Message 34 of 419

Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-03-18, 20:19 PM

I have exactly the same problem!

 

every time I boot Windows on battery processor is stuck on 0,77 GHZ. you can see a printscreen here http://screencast.com/t/wLQK1bdYc2014-03-18_2215_lenovo.png

 

and the processor throttles up on 3.2 ghz only if I reboot or I connect the power cable

 

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8 Posts

03-06-2014

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  • Message 35 of 419

Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-03-23, 6:45 AM

no slutions or upgrade yet?

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8 Posts

10-28-2013

Romania

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  • Message 36 of 419

Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-03-23, 21:07 PM

Lenovo staff, you are ignorant or you cannot find a solution for this problem? 

I've gave you 1000 Euro for this laptop so I expect some higher quality support from you!!!

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34 Posts

02-19-2014

Nederland

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  • Message 37 of 419

Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-03-25, 9:24 AM

@NINE,

 

could you check with Notebook FAE if they're able to reproduce the problem?

And if yes, if they're working on a solution?

 

Thanks in advance.

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11 Posts

11-14-2013

Slovakia

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  • Message 38 of 419

Performance on battery Z510

2014-03-25, 21:33 PM

Hello, at first - sorry for my bad english :).

 

I have one problem, or maybe it is problem of all Z510 laptops (W8 64bit + all drivers up to date). 

When I am working on battery (laptop is not plugged in), and I choose "High Performance" battery profile, so CPU is still working on 0,75 Ghz. And it never go up than 0,75 Ghz. When I am working on battery, I sometimes need a better speed of laptot, but CPU is still on 0,75 GHz and it doesn´t metter High Performance, Battery Saving or Balance.

 

Someone know where is the problem? Thank you!

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236 Posts

05-09-2010

Cochrane

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  • Message 39 of 419

Re: Performance on battery Z510

2014-03-26, 0:36 AM

This seems to be a known problem with the Z510 but Lenovo have not yet released an updated bios to fix this problem.

 

https://forums.lenovo.com/t5/IdeaPad-Y-U-V-Z-and-P-series/Re-Lenovo-Z510-CPU-stuck-at-0-77GHz/td-p/1470066

 

I am not sure what CPU you are using but the Core i7-4700MQ in my Y510P can run single threaded tasks at close to 3.60 GHz when on battery power.  While waiting for Lenovo to come up with a fix I would suggest that you try running ThrottleStop to correct the "stuck at 0.77 GHz" problem.

 

ThrottleStop 7.00 beta 1

http://www.mediafire.com/download/abuiqcg2x5iruby/ThrottleStop_700b1.zip

 

Go to Set Multiplier, check that and make sure it is set to the maximum value.  Click on the Turn On button and your problem should be solved so at least your laptop will be usable at a decent speed when running on battery power.

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7 Posts

12-21-2013

Hungary

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  • Message 40 of 419

Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-03-27, 20:39 PM

I am having this laptop now for 3 months.

(Win7 Home Premium and the latest Lenovo drivers)

Because of this CPU frequency problem the laptop can be used only as a desktop.

I have been waiting patiently for a solution, but this is getting really annoying by now.

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