Lenovo U300s Underclocking [ Edited ]

[Marcham93]

Hello Lenovo Forum,

I am having an issue with the U300s Ultrabook.

The machine will randomly downclock and lock it self to 44% maximum CPU Frequency.

I have tried reinstalling power manager, uninstalling power manager, checking the temperature of the machine and more and can't seem to get this machine to stop. (PS: I have the latest BIOS)

At first It seemed to happen when only plugged in, but as I sit here I notice it is happening on battery too.

Any help would be much appreciated as I am at wits end of what to do.

Thanks.

-Mike

[Marcham93]

Any ideas? =/

[tanujhanda Retired Partner]

Hello Mike,

Kindly update the BIOS and it may resolve the issue.

Download the BIOS update from the mentioned below web link.

http://consumersupport.lenovo.com/us/en/DriversDownloads/drivers_show_5482.html

If the issue persist and laptop is in warranty then you may contact the support center.

Country or Region	Language	Telephone number	Hours of operation	Supported products
United States	English	1 877 453 6686	24 hours a day 7 days a week	IdeaPad, Lenovo 3000, IdeaCentre

Best Regards,

Tanuj

[Agotthelf Community Moderator]

Hi Mike,

just an additional note to Tanuj´s good advice.

Before updating the bios, please do a fresh restart of the system and detach all external devices and load your battery.

Best regards

Andreas

Edit: I have checked if a thorttling occurs with my U550, plugged in and in high performance mode the Ressourcen Monitor shows 90% cpu frequency. No throttling.

[Marcham93]

Hey guys, as stated above I already have the latest BIOS.

[Mark_Lenovo Administrator]

Marcham93,

Cross posting from my comment on your more fully developed thread on the same topic on NBR..

Some random thoughts / questions on this...

1) Are you consistently testing with the same level of battery charge and AC plugged in? I ask because if you max out the power draw, I wonder if the battery is at a lower level if the voltage drops a bit as you draw higher amounts of power and the system sees this and throttles back?

2) What other benchmarks have you run and is there a difference in whether your benchmark is running single thread or multi-threaded ?

On some of the ThinkPad W520 power / performance issues we were working through last year, we noted that the quad cores could have a lowered (capped) clock rate when you engaged all the cores, while turbo-boost kicked in and ran higher clock speeds with single threaded tests that only engaged 1 core. Taxing graphics with furmark or other benchmark also reduced the clock speed to keep things under the TDP.

3) While you haven't mentioned any overheating, it sounds like you ran a temp monitoring package and tracked CPU / GPU temps vs your clock rate and testing to see what is going on?  What were the results?

Generally power or temp limits are what may cap / throttle the CPU. Or, there is just quirk in BIOS or Power Management.

We appreciate your ongoing information and observations on this!

Mark

[lead_org Microsoft MVP Contributor]

more importantly are you running the laptop with 65 or 90 watts adapter?

[Mark_Lenovo Administrator]

All,

We have made some progress on this issue and are addressing it in an upcoming BIOS - version 43.

So, Tanuj's advice will be correct - updating to version 43, once available should result this symptom.   I expect the new BIOS to be available in the next 1 to 2 weeks as it is in test now.

Best regards,

Mark

[NINE]

Hi all,

Just wonder if you have downloaded the new bios? Has the issue been recitified so far? 

Should the issue still persist could you guys PM me you details.

The details i need are :

• Machine Family (e.g. T61)
• Machine Type Model (e.g. 7660-14A)
• Machine Serial Number (e.g. L3-234A)
• Bios version
• Chipset model and driver version
• RAM (e.g. 2GB DDR3)
• OS (e.g. Win 7 64-bit Ultimate)
• Steps taken prior to a reported issue (for an example software or hardware installed)
• Driver list and version of components (depends on issue discussed)
• Customers country of residence

• First and Last Name
• Contact Phone Number
• Email Address
• Mailing Address
• Country of customers resided

Do let me know

Regards

[Marcham93]

Thanks for the concern NINE. The issue still does occur and I'm working on it with Mark_Lenovo.

Thanks though!