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DS90UB947-Q1: paired with ds90ub926 use GPIO7_REG for PWM dimming

Part Number: DS90UB947-Q1

Hi team,

Can we use GPIO7_REG for PWM dimming when pairing with ds90ub926?

We followed below setting 947(0x11=0x33), 926 (0x21=0x55), this configuration works for 925+926 but failed for 947+926. Besides, interrupt and video display works well, PWM frequency is 20kHz.

Is there anything wrong with my configuration? Does 947 support this kind of usage with 926?