SHARP Brain PW-A7300 >> Brainux

調整預設背光亮度

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參考資訊：
1. brainux

如下：

$ vim arch/arm/boot/dts/imx28-pwa7200.dts
    &backlight_display {
        default-brightness-level = <5>;
        status = "okay";
    };

P.S. 編譯後的imx28-pwa7200.dtb覆蓋到MicroSD imx28-pwg5300.dtb

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