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DS16EV5110 I2C方式控制方式无效原因

Other Parts Discussed in Thread: DS16EV5110

   现有一定制显卡,输入HDMI信号,采用DS16EV5110后端调节,增益采用引脚配置方式,原设定14dB,画面闪(抖)动(横线),在系统启动时还会现现超频提示,现改为24dB,画面改善,抖动完全消失,OK,可采用软件I2C配置,同样增益设为24dB,写入并读回确认配置OK,可画面仍闪(抖)动,用I2C将所有增益从小到大均配置一遍,均无效,请问硬件配置OK,软件为何同样配置不起作用?