如何在nexus 7上通过ADB设置亮度

Question

我在网上找到了一些信息:

echo 1 /sys/devices/platform/flashlight.0/leds/flashlight/brightness

但在我的Nexus 7(闪过一个AOSP)上,我找不到那个目录.

我应该写什么文件？这可行吗？

之后ls /sys/devices/platform,我得到了:

LID
alarm
arm-pmu.0
bcm4330_rfkill
bcmdhd_wlan.1
bluesleep
fiq_debugger.0
fsl-tegra-udc
gpio-keys.0
grouper_misc
leds-gpio
oprofile-perf.0
power
power.0
pwm-backlight
ram_console
reg-dummy
reg-fixed-voltage.1
reg-fixed-voltage.10
reg-fixed-voltage.11
reg-fixed-voltage.2
reg-fixed-voltage.3
reg-fixed-voltage.4
reg-fixed-voltage.6
reg-fixed-voltage.8
regulatory.0
sdhci-tegra.2
sdhci-tegra.3
serial8250
snd-soc-dummy
spdif-dit.0
spdif-dit.1
spi_tegra.0
spi_tegra.3
tegra-ehci.1
tegra-i2c.0
tegra-i2c.1
tegra-i2c.2
tegra-i2c.3
tegra-i2c.4
tegra-nvmap
tegra-otg
tegra-pcm-audio
tegra-se
tegra-snd-rt5640.0
tegra30-ahub
tegra30-dam.0
tegra30-dam.1
tegra30-dam.2
tegra30-hda
tegra30-i2s.1
tegra30-i2s.3
tegra30-i2s.4
tegra30-spdif
tegra_camera
tegra_pwm.0
tegra_rtc
tegra_smmu
tegra_uart.1
tegra_uart.2
tegra_uart.3
tegra_uart.4
tegra_wdt
uevent

Answer 1

Android Jellybean 4.2有一个新的二进制传送,可用于直接读/写系统设置提供程序,可通过命令行访问.

例如:为了增加屏幕​​亮度,请使用以下命令:

adb shell设置put system screen_brightness 200

Answer 2

你应该使用pwm背光！