Official Display • Touch Display 2 does not function correctly with POE+ hat (Pi4B)

I am attempting to use a Pi4B and a Touch Display 2 in order to produce a wall-mount kiosk. However, powering this via POE with the official POE+ hat causes what seems to be a I2C conflict with the Touch Display 2.

When the POE+ hat is present:

• The touch input does not function
• Control signals sent to the display to change its brightness or power state do not function.
• The dmesg log prints the following errors approximately once a second. (These only appear to start happening once the pi pulls updated packages. With the base image dated 2024-11-19, the errors do not appear in the log. However the device still does not function)

  Code:

  [   88.829263] Goodix-TS 10-005d: Error writing 1 bytes to 0x814e: -110[   89.853226] i2c-bcm2835 fe205000.i2c: i2c transfer timed out

I have seen a number of other reports, both on this forum and elsewhere, about problems surrounding this a similar combination with the Touch Display 1 in Pi OS Bookworm, and all of those seem to have been 'resolved' by switching back to Bullseye. However, this isn't a solution for the Display 2 as its driver is simply not present in Bullseye and the display does not function at all.

Is there a solution or workaround that will work for the Display 2? Is this combination simply not possible in Bookworm?

Statistics: Posted by Legroom5692 — Thu Dec 19, 2024 6:08 pm

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