Hi Haibo, I went through your schematic but I didn't find any obvious issue. Could you try this? Step 1: Power on your system. Step 2: Don't load the TSC2046 linux driver. Step 3: Probe the PENIRQ pin with a scope. Step 4: Touch the touch panel and then release your finger. Repeat for several times. As long as TSC2046 is power on, the PENIRQ pin will stay low when a touch is present and become high again when the finger is released. Therefore, when you lift you finger, on the scope you should see the PENIRQ change to high. Andy
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