Dell Latitude E6220 (Mid 2011) - Manual (Page 109)

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Diagnostics
Device Status Lights
Turns on when you turn on the computer and blinks when the computer is in a
power management mode.
Turns on when the computer reads or writes data.
Turns on steadily or blinks to indicate battery charge status.
Turns on when wireless networking is enabled.
Battery Status Lights
If the computer is connected to an electrical outlet, the battery light operates
as follows:
• Alternately blinking amber light and white light — An unauthenticated
or unsupported non-Dell AC adapter is attached to your laptop.
• Alternately blinking amber light with steady white light — Temporary
battery failure with AC adapter present.
• Constantly blinking amber light — Fatal battery failure with AC adapter
present.
• Light off — Battery in full charge mode with AC adapter present.
• White light on — Battery in charge mode with AC adapter present.
Diagnostics
• Device Status Lights
• Battery Status Lights
• LED Error Codes
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