Raspberry Pi 4 – Official 7” Touch Screen

smieschek

hi @Purdbull ,
Do you have the same behaviour without any other peripherals? (e.g. try without the HQ Camera)
How do you power the touchscreen now? Is it the official RPi Touchscreen connected via DSI?

piology

Somewhat similar but different, having issue with touch on the pi4 running rpi4-v11.5.11with official 7in. completes setup and reboots. Boots fine, looks good, but then it seems the touch sensor is continuously triggered and will not allow input. Anybody seen this?

smieschek

@piology yes, we've got a few bugreports about this, but were not able to reproduce it with devices in our lab. Do you have any peripherals connected? Does it always behave like this? What version of the touchscreen do you use?

piology

@smieschek Awesome, happy to help with some root cause analysis.
No accessories, just the pi 4 B and 5V and ground wires to the PI pin 4 and 6 and the v1.1 display ribbon cable.

I have 3 sets, fresh off Amazon all doing the same thing. Running nightly 11.5.11

smieschek

@piology I see no difference to my setup.
Do I get you right, that the touch works fine after your first boot and that you can go through the setup wizard, but after another reboot the touch doesn't work?
Have you provisioned any settings? Do you activate the device during setup wizard?
Can you connect a mouse when the touch doesn't work and go to emteria settings to send a bugreport?

piology

That is correct. Touch sort of works during initializing, laggy response, so I did connect USB keyboard with touchpad and it worked fine. No jittering or rapid fire recent apps Device activation during the setup is done.

When it's rapid fire touch sensing after boot I cannot navigate anywhere. Is there boot interup option to run in debug mode?

piology

So I also tried the live build and the display just looks like a zebra.

piology

On nightly 11.5.13 the system boots into setup, screen is stable, but the touch doesn't work at all

smieschek

@piology do you have a UART bridge?
Please contact support@emteria.com and we can schedule a live debug session

smieschek

We've patched the touch driver since nightly 11.6.19
If you were having issues with the touch events, please try that nightly. It will also be included in the upcoming release.

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