In an effort to save GPIO in our application, we strapped the TP_INT line high using a weak pullup resistor for I2C addressing assignment. It was discovered after that datasheet calls out having to switch this line to a host input. Upon power cycling with this configuration we can only get the touchscreen to accept commands if the interrupt line is probed with an oscilloscope probe (or other other transient connection). We then tried the to address using a pull-down instead, and this configuration seems to allow the touchscreen to function properly. Can someone provide a technical explanation if the state of the interrupt line is left as a host output either strapped low or high indefinitely?

Thank you in advance!

Reference page 10 of datasheet: