T46 S how to backlight on Idle for Extension key module

[AWS2P]

Hi,
when idle T46 S switch to blackscreen, it's ok but extension key module connected to the phone is not following this and stay enlighted.

How to have same behavior on both?

 

[complex1]

What type of expansion module are you using?
EXP40 or EXP50?
Because Backlight Time is not applicable to EXP50.

 

[AWS2P]

EXP40

 

[AWS2P]

Thanks a lot i've found a yealink answer
http://support.yealink.com/faq/faqInfo?id=553