Touchscreen calibration needed at startup after longer powercuts

[ProfDrJones]

We recently upgraded our external monitor to a 15'' IPS Touchscreen. (we have space constraints, ...)
After trying different model, with various problems I thought we found an affordable offbrand one that seemed to work, and it kind of does, ...

One of the main problems with the other screens was that they lost touch sporadically and even calibration wasn't helping. Or they would rotate trough different resolutions at the bootup, ... (even if set to a fixed resolution)

The new screen works reliably, no flickering, the bootscreen is shown instantly and touch works, even if power is cut to the console and the screen for a couple of minutes. Everything comes back up as before.

The Problem is if there is a longer powercut, e.g. over night.
On the next boot touch is simply not working. A quick calibration fixes the issue as if the calibration data is lost, ...

Is there a ways to keep the calibration or is there a magic setting I haven't seen?

Or is there a debug option that logs the boot process?

(As this might be asked, ... we already upgraded to zerOS 7.13)

[Edward Z88]

Hi @ProfDrJones

21 minutes ago, ProfDrJones said:

The Problem is if there is a longer powercut, e.g. over night.
On the next boot touch is simply not working. A quick calibration fixes the issue as if the calibration data is lost, ...

Is there a ways to keep the calibration or is there a magic setting I haven't seen?

When you calibrate a touchscreen on FLX, the calibration is saved along with a reference to your touchscreen's unique ID. It therefore sounds like FLX is unable to detect the touchscreen's ID upon reboot, and therefore doesn't apply the existing calibration.

Out of interest, if you just turn off the FLX overnight, but leave the external touchscreen powered (standby), do you encounter the same issue?

After calibrating the external touchscreen, please tap Z -> System Information -> System Info, and take a picture of this screen. If the external touchscreen's calibration is then lost upon reboot, please go back into System Info, and take a picture of this screen again. Please then email these two pictures to support@zero88.com, preferably with a link to your external touchscreen's manufacturer webpage. We will then be able to investigate further.

Please let us know if you have any questions.

[ProfDrJones]

Thanks for the reply, ...

I will try this tonight.

[ProfDrJones]

Thanks for the support, but the issue kind of settled by it self somehow, ...

I think the output you were looking for was:

USB Device...
EEEF:2828 - 'TSTP', 'MTouch', 'CMTP_1.0'

and corresponding to that:

Input Device...
/dev/input/event1, TSTP MTouch, usb-ci_hdrc.1-1.1/input0, CMTP_1.0

I don't know why, but the first 5 or 6 boots we had to recalibrate in order to get touch capability, ... but now, for the last week or so it worked like a charm.

---

Hopefully this will be the case as well as soon as we get our new active usb hub. We need that to supply power to a backlight keyboard and the build in usb ports are to few as well.

[Edward Z88]

On 7/3/2023 at 11:37 AM, ProfDrJones said:

I don't know why, but the first 5 or 6 boots we had to recalibrate in order to get touch capability, ... but now, for the last week or so it worked like a charm.

Thank you for the update. Pleased to hear this is working.

Please continue to monitor the calibration behaviour, and if you encounter any issues, please don't hesitate to let us know.