Display not working any more after update to ESPhome 2024.10.0

ESPHome
1

This morning, I updated ESPhome to 2024.10.0.
Everything went smooth, except that a 20x4 LC display doesn’t show any text any more, display just stays blank.

The ESP32 S2 to which the display is connected to is otherwise working as it should, i.e. it is still delivering sensor values to homeassistant, it just doesn’t display anything any more.

Logs of the ESP32 are totally normal, not any sign of a problem.

Does anybody else observe such problems with ESPhome 2024.10.0?
Any hints where to search for the error?

2

Try viewing the serial data log from the device:

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3

Updating to esphome won’t change the firmware, unless you also update each esp device.

4

@sparkydave There is absolutely nothing abnormal in the logs of the ESP32 device. No hint at all why the display is not showing anything

@nickrout I forgot to mention in my first post: Yes, after update to 2024.10.0, I also updated the firmware on the ESP32 device. That’s when the problem started.

5

Found the culprit: frequency of I2C bus A (to which the display is connected) was set to 400kHz → display not working

After setting it to 100kHz → display working again, also with 200kHz.

Just curious why it has been working before with 2024.09.2 with 400kHz…

Anyways, case closed.

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