Backlight doesn't work under battery power

[steverm1]

I have a Dell inspiron 6400 laptop. The monitor backlight works fine when
under mains power but the monitor backlight doesn't work under battery power.

I can still see the display, but it isn't lit.

Is there a fix for this?

 

[peter]

and DELL says what???????????????//
peter

 

[zhangxiang]

Have you tried to use Fn+arrow up ?
If it dows work ,then you just need to change the setting in the control

 

[steverm1]

Thanks zhangxiang,

The fn arrow up worked. Not sure where to fix in the control panel but I'll
work it out.

Cheers