You have been subscribed to a public bug:
If the touch is on the screen and taps the screen with the pen, the
touch is interrupted and the touch end event is not received. This
problem is reproduced in ubuntu20.04. ubuntu18.04 does not have this
problem. This is the log obtained using xinput --test-xi2.
EVENT type 23 (RawTouchUpdate)
device: 2 (10)
detail: 2
valuators:
0: 39423.40 (39423.40)
1: 35779.45 (35779.45)
EVENT type 23 (RawTouchUpdate)
device: 2 (10)
detail: 2
valuators:
0: 39423.40 (39423.40)
1: 35777.45 (35777.45)
EVENT type 23 (RawTouchUpdate)
device: 2 (10)
detail: 2
valuators:
0: 39423.40 (39423.40)
1: 35779.45 (35779.45)
EVENT type 11 (HierarchyChanged)
Changes happened: [new slave]
device 2 [master pointer (3)] is enabled
device 3 [master keyboard (2)] is enabled
device 4 [slave pointer (2)] is enabled
device 5 [slave keyboard (3)] is enabled
device 6 [slave keyboard (3)] is enabled
device 7 [slave keyboard (3)] is enabled
device 8 [slave keyboard (3)] is enabled
device 9 [slave keyboard (3)] is enabled
device 10 [slave pointer (2)] is enabled
device 11 [slave keyboard (3)] is enabled
device 12 [slave keyboard (3)] is enabled
device 13 [slave keyboard (3)] is enabled
device 14 [slave keyboard (3)] is enabled
device 15 [slave keyboard (3)] is enabled
device 16 [slave keyboard (3)] is enabled
device 17 [slave keyboard (3)] is enabled
device 18 [slave pointer (2)] is enabled
device 19 [slave keyboard (3)] is enabled
device 20 [slave pointer (2)] is enabled
device 21 [slave keyboard (3)] is enabled
device 22 [slave keyboard (3)] is enabled
device 23 [slave keyboard (3)] is enabled
device 24 [slave pointer (2)] is enabled
device 25 [slave keyboard (3)] is enabled
device 26 [slave keyboard (3)] is enabled
device 27 [slave pointer (2)] is enabled
device 28 [floating slave (0)] is disabled
changes: [new slave]
EVENT type 12 (PropertyEvent)
property: 338 'Device Accel Velocity Scaling'
changed: deleted
EVENT type 12 (PropertyEvent)
property: 337 'Device Accel Adaptive Deceleration'
changed: deleted
EVENT type 12 (PropertyEvent)
property: 336 'Device Accel Constant Deceleration'
changed: deleted
EVENT type 12 (PropertyEvent)
property: 335 'Device Accel Profile'
changed: deleted
EVENT type 12 (PropertyEvent)
property: 203 'Device Enabled'
changed: modified
EVENT type 11 (HierarchyChanged)
Changes happened: [device enabled]
device 2 [master pointer (3)] is enabled
device 3 [master keyboard (2)] is enabled
device 4 [slave pointer (2)] is enabled
device 5 [slave keyboard (3)] is enabled
device 6 [slave keyboard (3)] is enabled
device 7 [slave keyboard (3)] is enabled
device 8 [slave keyboard (3)] is enabled
device 9 [slave keyboard (3)] is enabled
device 10 [slave pointer (2)] is enabled
device 11 [slave keyboard (3)] is enabled
device 12 [slave keyboard (3)] is enabled
device 13 [slave keyboard (3)] is enabled
device 14 [slave keyboard (3)] is enabled
device 15 [slave keyboard (3)] is enabled
device 16 [slave keyboard (3)] is enabled
device 17 [slave keyboard (3)] is enabled
device 18 [slave pointer (2)] is enabled
device 19 [slave keyboard (3)] is enabled
device 20 [slave pointer (2)] is enabled
device 21 [slave keyboard (3)] is enabled
device 22 [slave keyboard (3)] is enabled
device 23 [slave keyboard (3)] is enabled
device 24 [slave pointer (2)] is enabled
device 25 [slave keyboard (3)] is enabled
device 26 [slave keyboard (3)] is enabled
device 27 [slave pointer (2)] is enabled
device 28 [slave pointer (2)] is enabled
changes: [device enabled]
EVENT type 1 (DeviceChanged)
device: 2 (28)
reason: SlaveSwitch
Reporting 3 classes:
Class originated from: 28. Type: XIButtonClass
Buttons supported: 7
Button labels: None None None "SECONDARY" None None None
Button state:
Class originated from: 28. Type: XIValuatorClass
Detail for Valuator 0:
Label: Abs X
Range: 0.000000 - 16777215.000000
Resolution: 0 units/m
Mode: absolute
Current value: 0.000000
Class originated from: 28. Type: XIValuatorClass
Detail for Valuator 1:
Label: Abs Y
Range: 0.000000 - 16777215.000000
Resolution: 0 units/m
Mode: absolute
Current value: 0.000000
EVENT type 17 (RawMotion)
device: 2 (28)
detail: 0
flags:
valuators:
0: 11471359.32 (11471359.32)
1: 9371135.44 (9371135.44)
EVENT type 17 (RawMotion)
device: 2 (28)
detail: 0
flags:
valuators:
0: 11471359.32 (11471359.32)
1: 9371135.44 (9371135.44)
EVENT type 15 (RawButtonPress)
device: 2 (28)
detail: 1
flags:
valuators:
EVENT type 10 (FocusOut)
device: 3 (3)
windows: root 0x200 event 0x3e00001 child 0x0
mode: NotifyNormal (detail NotifyNonlinear)
flags: [same screen]
buttons: 1
modifiers: locked 0 latched 0 base 0 effective: 0
group: locked 0 latched 0 base 0 effective: 0
root x/y: 2800.00 / 1206.00
event x/y: 2590.00 / 1018.00
EVENT type 17 (RawMotion)
device: 2 (28)
detail: 0
flags:
valuators:
0: 11471359.32 (11471359.32)
1: 9371135.44 (9371135.44)
EVENT type 16 (RawButtonRelease)
device: 2 (28)
detail: 1
flags:
valuators:
EVENT type 13 (RawKeyPress)
device: 3 (21)
detail: 37
valuators:
EVENT type 13 (RawKeyPress)
device: 3 (21)
detail: 54
valuators:
^C
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: bot-comment
--
touch input lost touch end event
https://bugs.launchpad.net/bugs/1964761
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