Three finger swipes are sometimes not detected

[fiso64]

Describe the bug

Sometimes three finger swipes (in any direction) are not recognized, no matter how hard I swipe. --debug shows that nothing is detected at all. Four-finger swipes are unaffected. In fact, performing a four-finger swipe usually restores three finger swipes.

Unfortunately, I have no idea how to reproduce this reliably, even though it happens quite often. What additional debugging steps could I take?

Your environment

• Version of Touchégg: v2.0.17.
• Operating System: Arch Linux
• Desktop Environment: Gnome
• Are you using Wayland? No

Configuration

<touchégg>
  <settings>
    <property name="animation_delay">150</property>
    <property name="action_execute_threshold">20</property>
    <property name="color">auto</property>
    <property name="borderColor">auto</property>
  </settings>
  <application name="All">
    <gesture type="PINCH" fingers="3" direction="IN">
      <action type="CLOSE_WINDOW">
        <animate>true</animate>
        <color>F84A53</color>
        <borderColor>F84A53</borderColor>
      </action>
    </gesture>
    <gesture type="PINCH" fingers="4" direction="OUT">
      <action type="SHOW_DESKTOP">
        <animate>true</animate>
      </action>
    </gesture>
    <gesture type="PINCH" fingers="4" direction="IN">
      <action type="SEND_KEYS">
        <repeat>false</repeat>
        <modifiers>Super_L</modifiers>
        <keys>A</keys>
        <on>begin</on>
      </action>
    </gesture>
    <gesture type="TAP" fingers="2" direction="UNKNOWN">
      <action type="MOUSE_CLICK">
        <button>3</button>
        <on>begin</on>
      </action>
    </gesture>
    <gesture type="TAP" fingers="3" direction="UNKNOWN">
      <action type="MOUSE_CLICK">
        <button>2</button>
        <on>begin</on>
      </action>
    </gesture>
    <gesture type="SWIPE" fingers="3" direction="UP">
      <action type="SEND_KEYS">
        <modifiers>Alt_L</modifiers>
        <keys>Right</keys>
        <repeat>false</repeat>
        <animation>NONE</animation>
        <on>begin</on>
      </action>
    </gesture>
    <gesture type="SWIPE" fingers="3" direction="DOWN">
      <action type="SEND_KEYS">
        <modifiers>Alt_L</modifiers>
        <keys>Left</keys>
        <repeat>false</repeat>
        <animation>NONE</animation>
        <on>begin</on>
      </action>
    </gesture>
    <gesture type="SWIPE" fingers="4" direction="UP">
      <action type="SEND_KEYS">
        <modifiers>Control_L</modifiers>
        <keys>t</keys>
        <repeat>false</repeat>
        <animation>NONE</animation>
        <on>begin</on>
      </action>
    </gesture>
    <gesture type="SWIPE" fingers="4" direction="DOWN">
      <action type="SEND_KEYS">
        <modifiers>Control_L</modifiers>
        <keys>w</keys>
        <repeat>false</repeat>
        <animation>NONE</animation>
        <on>begin</on>
      </action>
    </gesture>
    <gesture type="SWIPE" fingers="4" direction="LEFT">
      <action type="SEND_KEYS">
        <modifiers>Control_L</modifiers>
        <keys>Prior</keys>
        <repeat>false</repeat>
        <animation>NONE</animation>
        <on>begin</on>
      </action>
    </gesture>
    <gesture type="SWIPE" fingers="4" direction="RIGHT">
      <action type="SEND_KEYS">
        <modifiers>Control_L</modifiers>
        <keys>Next</keys>
        <repeat>false</repeat>
        <animation>NONE</animation>
        <on>begin</on>
      </action>
    </gesture>
    <gesture type="SWIPE" fingers="3" direction="LEFT">
      <action type="SEND_KEYS">
        <modifiers>Alt_L</modifiers>
        <keys>Left</keys>
        <repeat>false</repeat>
        <animation>NONE</animation>
        <on>begin</on>
      </action>
    </gesture>
    <gesture type="SWIPE" fingers="3" direction="RIGHT">
      <action type="SEND_KEYS">
        <modifiers>Alt_L</modifiers>
        <keys>Right</keys>
        <repeat>false</repeat>
        <animation>NONE</animation>
        <on>begin</on>
      </action>
    </gesture>
  </application>
</touchégg>

[JoseExposito]

This is most likely a problem in one of the layers under Touchégg: libinput or the kernel.

You can see if libinput detects the swipes running sudo libinput debug-events --verbose. If you try to perform the gesture, you see that libinput picks it but Touchégg doesn't, then the issue is in Touchégg.

Otherwise, we'll have to investigate where is the problem happening.