Touch doesn't work and issue when touch one metal

[danihmorais]

Hello. Excuse my English, I'm from Brazil. I tested the HOW-TO of @fbeltrao-br and the screen appears, with the klipper screen etc. However, I'm having problems with the touch. It rarely works with touch and, for some reason that I have no idea, I can't touch ANY metal part, especially the frame that surrounds the screen or the button; and because the touch barely works, I can't calibrate it. I really don't know if this is a lack of calibration or some hardware problem. Any ideas?

In the video, when I try to click to go back, I end up touching the metal part and the screen shows a bit of the problem, artefacts quickly. Then when I actually touch the metal part, the screen disappears, and only appears again if I restart.

WhatsApp.Video.2025-02-23.at.01.22.36.mp4

[danihmorais]

update: the touch problem appears to indeed be kernel related; I installed version 6.1, as indicated in the how-to of @fbeltrao-br, and now it is working correctly. however, you still cannot touch the metal part. another important observation is that when I was using the current kernel, 6.6, I set the gpio-debounce parameter to <10>; This made the artifacts stop appearing and the screen turned white. It was a suggestion from the gpt chat and I honestly don't know what it means. Finally, confirmed that in version 6.1 it works; Now I'm going to try to "isolate" the metal part of the contacts on the board, but it's interesting that I need to do this, because the screen works normally on the Marlin, when connected directly to the MCU, which suggests that, even if it's a hardware problem, it can be overcome somehow via software, or that the MCU has some additional component that the RPI doesn't have.