Lenovo Ideapad U300S laptop - BIOS modding help required

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Brunette Babe

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Hello

I'm hoping a fellow forumite can do me a favour please.
I have a Lenovo Ideapad laptop - model : U300S

This laptop's bios is made such that if the battery charge is below 80% and the charger is plugged in, the cpu is throttled to 50% of its capacity.
With the charger is plugged in and if the battery is charged to above 80% the throttling stops sometimes, and sometimes the throttling never stops.
Lenovo is aware of this issue but have never actually fixed the problem even though their latest bios update for this laptop states that it fixes this problem.

As I am not an advanced user and do not know how to edit or modify the bios of my laptop please can someone edit / modify the bios for my laptop, so that the throttling will only take place when the battery charger is plugged in and the battery percentage is below 2%.
I would like the throttling to only take place when the charger is plugged in and if the charge level of the battery is 2% or below, instead of the current 80% or below level as per the bios from Lenovo.

The current bios update file from the Lenovo website can be found here: http://download.lenovo.com/consumer/mobiles/56cn43ww.exe

Would someone be able to modify the above bios update file ? Are there any other files that would be required from me ?

I will sincerely appreciate the help.

Thank you !
 
Check your power mode, also are you sure this isnt Intel's speedstep kicking in?

If your cpu was at its maximum frequency all the time, the battery would die very quickly.
 
Rickster said:
Check your power mode, also are you sure this isnt Intel's speedstep kicking in?

If your cpu was at its maximum frequency all the time, the battery would die very quickly.
Click to expand...


Power mode is set to high performance, as it should be. No it isn't Intel's speedstep kicking in.
This is a specific cpu throttling issue acknowledged by Lenovo, but never fixed by them.
Only way to resolve it would be to mod the bios as I requested in my original post above.
 
in response to your original request, it is doubtful anybody will be able to assist.
Not impossible. But you need to know a lot more about the actual structure of the bios to be able to entertain any thought of fixing it.
And very few people will have access to that information

You perhaps could achieve satisfaction looking into throttlestop
http://forum.notebookreview.com/threads/the-throttlestop-guide.531329/
 
Brunette Babe said:
Power mode is set to high performance, as it should be.
Click to expand...

Then why did you buy an UltraBook? If CPU performance is so critical that you have to have it running at maximum performance, then you bough the wrong laptop.

Also, BIOS modding is very, very tricky. I've only modded BIOS's/EFI's by adding SLIC tables and that alone can brick your laptop. Messing around with CPU settings is not really worth the risk for that small amount of gain.
 
@vinodh

I get that it is an ultrabook and it's not a performance machine, but the problem with this laptop is that if you plug the charger when the battery is below 80% the throttling kicks in.
In theory the throttling should stop when the battery is charged to a level greater than 80%, but this almost never happens.
That means the throttling persists even when it should have stopped. Rebooting is the only way to get the throttling to stop.
It can become quite frustrating.

Lenovo are aware of this problem but never did fix the issue - many other users of this model experience the same issue.

I understand that modding a bios is tricky and risky, but you seem knowledgeable to undertake such a task.
Would you be willing to try modding my laptop's bios ?

Thank you
 
I did some research on your problem and it seems that what you want may be possible. However, it's complicated and dangerous. Here's an example: http://donovan6000.blogspot.com/2013/06/insyde-bios-modding-advanced-and-power-tabs.html

If you read through some of the comments, you'll see the author mentioning the possibility of bricking your laptop. I suggest you try something like ThrottleStop or maybe even upgrading to Windows 8.1 since it has slightly better power management than Windows 7. Ubuntu with TLP might also be an option.

I understand that you want your laptop to function correctly without having to use workarounds but I really don't think it's worth the risk.
 
have tried Throttlestop, but it hasn't helped.
i think the only thing that will work will be modding the bios.
problem is i have no idea how to go about doing that.
 
Brunette Babe said:
have tried Throttlestop, but it hasn't helped.
i think the only thing that will work will be modding the bios.
problem is i have no idea how to go about doing that.
Click to expand...

As mentioned above, visit mydigitallife.info and request help. They are the experts with BIOS modding. Personally, i'd sell the laptop and buy another of carbonite.co.za. Or live with the issue. Modding the BIOS is one thing. The only way to be sure that it will work is to flash it and if something goes wrong, meaning the modded BIOS had an error or the flashing process had an issue, you can literally end up throwing you laptop away.
 
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