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11-19-2007

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-08-19, 16:27 PM

 

All,

 

We are following up on this but would like to clarify:

 

1) Please confirm when you downloaded and updated the BIOS again.

2) Please confirm in BIOS the version displayed.

3) Please define what the most recent problem / symptoms that remain

 

Thanks

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26 Posts

06-17-2014

Saudi Arabia

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-08-19, 19:48 PM
Downloaded and installed the so called 'new update'. Firstly the earlier update was V39. This update is V39 as well. Anyways I still installed it. The same bug persists. CPU gets stuck at 0.77GHz. In other words the multiplier stops responding.
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02-19-2014

Nederland

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-08-19, 20:06 PM

When I try to flash the 'new' bios the flasher says the bios is already installed and quits.

I'll save you all a lot of time and hope, I did a Total Commander file compare between the bios from 04-04-2014 and the bios from 08-18-2014 and they are binary identical. The only thing that has changed is the upload date on the website.

 

To answer Mark's questions:

1) April 2014

2) 8DCN39WW

3) The CPU is not stuck on 800 MHz anymore which was most important for me. I noticed the notebook became a lot noisier, probably due to an EC update, compared to bios W37 (both on AC)

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30 Posts

08-09-2014

Tunisia

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-08-19, 22:48 PM
some times happens when you power up the pc whenn it's plugged, sometimes in conservation mode if you restart your computer
i still use the old bios
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10 Posts

05-13-2014

Thailand

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-08-20, 12:55 PM

 I did a MD5 Checksum Compaire bios file  from 04-04-2014 and file 08-18-2014  It 's same file.

 

Any body can tell me....

 

What 's the lenovo technicial support do. 

 

 

 

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34 Posts

09-16-2012

ChicagoLand

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-08-22, 1:51 AM

wrote:

 

All,

 

We are following up on this but would like to clarify:

 

1) Please confirm when you downloaded and updated the BIOS again.

2) Please confirm in BIOS the version displayed.

3) Please define what the most recent problem / symptoms that remain

 

Thanks


Hi.  I have a z510 with an i7 4700mq processor.  Here is some exact scenarios that I run into and how to reproduce the problem.  Note that these are all done on the 'Balanced' power profile on the Lenovo Energy Manager.  The processor seems to range from .77Ghz to the maximum of 3.4Ghz as needed, except for the following scenarios:  

 

1.) This one seems to be the most serious: Start Computer while on DC power -> Unit works normally -> Put laptop in stand by -> Unplug unit from DC power -> bring computer back from standby -> Computer is now LOCKED at .77GH -> The ONLY way to get it unlocked is to plug it back in.  Otherwise, it will always be stuck at .77 Ghz.  not even a computer restart unlocks it.  

 

2.) I don't know if this is a problem or more of an inconsistency.  Start computer on DC Power -> Unit works normally -> Unplug unit -> Unit will not go above 2.4ghz but still generally works well -> turn off and restart computer -> processor will go up to 3.4 ghz as needed, just as if it is plugged in.  

 

Let me know your thoughts.  

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26 Posts

06-17-2014

Saudi Arabia

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-08-22, 2:51 AM
I don't know how to exactly replicate this scenario. But in short when your laptop is on standby for long with DC power. It still goes into 0.77GHz. No way out of it then even if rebooted. Only way to solve this is to put your computer on standby, then resume. Plug out the DC supply and plug it back in. Now it comes back to normal.
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34 Posts

09-16-2012

ChicagoLand

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-08-22, 3:14 AM
@bhavinshah_321 so yep, your thoughts coincide with my issues as well. Basically, the common theme here is that standby mode. It's like the computer forgets how to manage the processor when you use standby. Try my scenario above and see if you get it stuck at .77 as well.
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26 Posts

06-17-2014

Saudi Arabia

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-08-22, 14:09 PM
I can confirm I am facing same issues as you. I tried to replicate the scenarios you mentioned and it got stuck at 0.77 GHz
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70 Posts

07-04-2014

India

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-08-24, 3:46 AM
yep....the same issues as @jhorton328 mentioned
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