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矩阵键盘按下的时候，lcd可以被唤醒。但是触摸屏上面点击，唤醒不了lcd。
用的是哪个操作系统？AM335x支持触摸屏唤醒，估计是底层驱动没有配对吧。
ti-processor-sdk-linux-am335x-evm-01.00.00.03，4线电阻屏
请参考power management，支持触摸屏唤醒的：
http://processors.wiki.ti.com/index.php/Linux_Core_Power_Management_User%27s_Guide_(v4.1)#Suspend.2FResume
