Special BIOS for Portege M400 - Change the Fan behaviour / noise when the unit works in idle mode or low CPU load mode.

TOSHIBA

Technical Support Bulletin

TSB6A01KJ0000R01

Document details:

-	Product:	Portege M400
-	Model No.:
-	Operating System:	Windows XP

more details...

Issue:

It could be, that you are not satisfied with the Fan behaviour / noise when the unit works in idle mode or low CPU load mode.

Summary:

A special BIOS was released with a noise improvement in idle mode and low CPU load mode.

Resolution:

If you are not satisfied with the fan behaviour / noise, please install one of the following special BIOS with a noise improvement in idle mode and low CPU load mode.
This BIOS implements a Fan table with lower Fan RPM on low CPU load.
However, the lower FAN speed will result in higher temperatures on user touchable areas such as palmrest or base cover (raise of approximately 3 degrees celsius).

Traditional BIOS V1.80W (fan behaviour only):

Traditional BIOS V2.10N (fan behaviour AND widescreen support):

WinBIOS V1.80W (fan behaviour only):

WinBIOS V2.10N (fan behaviour AND widescreen support):

Note:
If you apply later on a newer (or older) BIOS version you will loose this behaviour again!

Disclaimer:

Toshiba provides this information "as is" without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of merchantability or fitness for a particular purpose. Toshiba shall not be responsible for the topicality, correctness, completeness or quality of the information or software provided. Toshiba is not liable for any damage caused by the use of any information or software provided, including information that is incomplete or incorrect.