Calibration file blocks Octoprint-TFT from showing

[wlcina]

I successfully installed Octopi-TFT.
I am using waveshare TFT display with its driver
git clone https://github.com/waveshare/LCD-show.git

• After checking I found out display is not calibrated, so I executed calibration tool

cp LCD-show/xinput-calibrator_0.7.5-1_armhf.deb ~/
sudo dpkg -i -B xinput-calibrator_0.7.5-1_armhf.deb

• Running calibrator and finish calibration
  DISPLAY=:0.0 xinput_calibrator
• I got some calibration data, I was supposed to save the calibration data to 99-clibration.conf file

sudo mkdir /etc/X11/xorg.conf.d
sudo nano /etc/X11/xorg.conf.d/99-calibration.conf - where I pasted them

Section "InputClass"
        Identifier      "calibration"
        MatchProduct    "ADS7846 Touchscreen"
        Option  "Calibration"   "259 3911 3757 156"
        Option  "SwapAxes"      "0"
EndSection

Then I reboot the device
sudo reboot
After that the Octoprint-TFT wont show, just black screen.
If I remove calibration data file 99-calibration.conf and reboot the device, Octoprint-TFT is again on the screen, but I cant use it, as the display is not calibrated.

Anyone know what I am supposed to do?

[synman]

I think you are missing the actual display driver reference. My Pi is not physically available to me right now but I have the exact same display on one of my Pi's and have it working fine.

Your x11 startup log likely states that you have no configured displays.

[synman]

here you go:

Section "InputClass"
        Identifier      "calibration"
        MatchProduct    "ADS7846 Touchscreen"
        Option  "Calibration"   "3932 300 294 3801"
        Option  "SwapAxes"      "1"
EndSection

Section "Device"
  Identifier "touchscreen"
  Driver "fbdev"
  Option "fbdev" "/dev/fb1"
EndSection

[synman]

additionally, mine is here:

./usr/share/X11/xorg.conf.d/99-calibration.conf

X11 will look in a couple different places so make sure you don't have a collision occurring.

[synman]

my apologies for the spamming... it looks like I just made sure I had the same file in both locations:

pi@octopi-laser:/etc/X11/xorg.conf.d $ cat 99-calibration.conf 
Section "InputClass"
        Identifier      "calibration"
        MatchProduct    "ADS7846 Touchscreen"
        Option  "Calibration"   "3932 300 294 3801"
        Option  "SwapAxes"      "1"
EndSection

Section "Device" 
  Identifier "touchscreen"
  Driver "fbdev"
  Option "fbdev" "/dev/fb1"
EndSection

[wlcina]

Thanks! You find a solution for me, what I did - deleted the calibration file, rebooted device. Then run the calibration to have calibration data. And finally created the file in both locations as you specified. (also added the "Device" section)

[synman]

Yeah, pretty sure it was the missing device section causing you problems as that is how x11 knows which device driver to use for the actual display.

Glad you got it working. Congrats!