Bsrgvty

I have an old windows tablet that I have managed to install Ubuntu on (a WinBook TW700) and it works pretty well. I originally installed 16.04 and was able to address the inverted axis through use of xinput-calibrator and editing the 99-configuration.conf file and had the screen working great. Then I made the mistake of upgrading to 19.04.

in 19.04 I am no longer able to configure the screen at all. touch is recognized (and now rotation works although this is also inverted) but if I touch the lower right corner the pointer appears in the upper left and vice versa. the 99-configuration.conf seems to have no effect. How and where can I make adjustments to get this configuration correct? It would be great if I could get both the inverted x and y settings and the screen rotation correct. Thank you for any help or advice.

This worked for me since kernel 4.20 which was the first time I had any touchscreen at all.I had to , and still have to run scripts to rotate and until kernel 5.0 I had to run this following script to calibrate the touch pen and screen.
The key line is:

xinput map-to-output $i eDP

where $1 is what you get from xinput and it is a number (which I found could change between boots, so I get it from the name with the deviceid= line, mine being ELAN0732:00). note I have to touch the screen to activate the pen to get it to show up in xinput. the number changes all the time.

I had an issue last week with the pen cursor being off where the pen was contacting, but this has, er, magically resolved itself, actually just checked and its back so I need to work on that one. I think my script just fixed it again.

This link helped with the rotations. I still don't have those showing in display settings, though I think it once did. Such is consistent with Ubuntu AMD experiences this year.
https://wiki.ubuntu.com/X/InputCoordinateTransformation

I made a script saved as RotateMapToOutputs.sh

# dont forget to touch the screen first with the pen.
touchscreen=""
pen=""

OIFS=$IFS
search=""ELAN0732:00""

# note that the pen didnt show up until I mapped the standard one or clicked the screen.
# so need to do that first
echo $search

list=$(xinput | grep $search | grep pointer)
echo "list $list"

# just a text file to work with the list.
if [ -f tempxinput.txt ]
then 
 echo " removing tempxinput"
 rm tempxinput.txt
fi

device_id=$(echo "$list" | sed -n 's/.*ELAN0732:00.*id=([0-9]*).*/1/p')

for i in $device_id
do
echo "id is $i"
xinput map-to-output $i eDP

done

I then set a keyboard shortcut to do

bash "~/MyScripts/ RotateMapToOutputs.sh"

as it seems like you might have troubles with rotation, this is my rotate inverted script and I made a shortcut key as above. (note the maptoputput there might be in error as 14 is no longer that one, so I can then run the above maptooutputs after any rotation if it doesn't calibrate.

xrandr --output eDP --rotate inverted && xinput set-prop 'ELAN0732:00 04F3:2536 Pen (0)' --type=float "Coordinate Transformation Matrix" -1 0 1 0 -1 1 0 0 1 && xinput map-to-output 'ELAN0732:00 04F3:2536 Pen (0)' eDP && xinput map-to-output 14 eDP 

normal is:

xrandr --output eDP --rotate normal && xinput set-prop 'ELAN0732:00 04F3:2536 Pen (0)' --type=float "Coordinate Transformation Matrix" 0 0 0 0 0 0 0 0 0 && xinput map-to-output 'ELAN0732:00 04F3:2536 Pen (0)' eDP && xinput map-to-output 14 eDP 

left:

xrandr --output eDP --rotate left && xinput set-prop 'ELAN0732:00 04F3:2536 Pen (0)' --type=float "Coordinate Transformation Matrix" 0 -1 1 1 0 0 0 0 1 && xinput map-to-output 'ELAN0732:00 04F3:2536 Pen (0)' eDP && xinput map-to-output 14 eDP 

right:

xrandr --output eDP --rotate right && xinput set-prop 'ELAN0732:00 04F3:2536 Pen (0)' --type=float "Coordinate Transformation Matrix" 0 1 0 -1 0 1 0 0 1 && xinput map-to-output 'ELAN0732:00 04F3:2536 Pen (0)' eDP && xinput map-to-output 14 eDP