It's a power saving feature, continuous use of Keyboard backlight will drain the battery and will reduce the usage time.
The answer which is claimed to be an answer is not an answer.On my laptop even when it is plugged into AC Power the keyboard backlight ALWAYS turns off after 30 seconds.How can I make it so that my laptop keyboard when it's using AC and BATTERY power NEVER EVER EVER turn off?ACER, there is something wrong with your drivers or software.Please fix this.
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