Right-click button performs left-click action

[ixxie]

Hardware: Dell XPS 9350

Channel: Unstable 18.09pre (the problem does not occur in 18.03pre)

Symptoms occur on the trackpad but not on an external mouse:

1. The right-click button performs a left-click action
2. Clicking both the left and right buttons simultaneously performs a right-click action

Configuration options which may be relevant:

 hardware.enableAllFirmware = true;

 services.xserver.libinput = 
 {
   enable = true;
   buttonMapping = "1 2 3 4 5 6 7 8 9";
 };
    
 boot.blacklistedKernelModules = [  "psmouse" ];   # for psmouse error

Stuff tried includes:

1. BIOS Firmware Update

2. Fiddling with libinput, trying various permutations of the following options:

 services.xserver.libinput = 
 {
   enable = true;
   middleEmulation = false;
   buttonMapping = "1 3 2 4 5 6 7 8 9";
   additionalOptions =
   ''
     Option "ClickPad" "true"
     Option "EmulateMidButtonTime" "0"
   '';
 };

The last one being recommended here.

[jtojnar]

If you use GNOME, they changed the defaults in 3.28.

Something like the following should fix it:

services.xserver.desktopManager.gnome3.extraGSettingsOverrides = ''
  [org.gnome.desktop.peripherals.touchpad]
  click-method='default'
'';

[ixxie]

@jtojnar that did the trick indeed! Thanks 👍