On Tue, 17 Nov 2020 18:50:15 -0500
Hendrik Boom <hendrik@???> wrote:

> On Tue, Nov 17, 2020 at 05:54:45PM -0500, Haines Brown wrote:
> > I infer from those kind enough to answer that my problem getting
> > the mouse to paste what it scanned is not unusual. When the problem
> > shows up again I'll try to paste with both mouse buttons rather
> > than the button.
>
> I've always had difficulty pressing both buttons close enough that
> the computer recognises them as being at the same time. Also, I
> think there's some kind of mouse configuration that is required for
> this to work.

YMMV, but For my beowulf installation using Xfce4 -> right click on
blan area f screen, then applications -> Settings -> 'Mouse & Touchpad'
-> choose your device and configuration under Devices/Behaviour/Theme.

It is probably 'double click;time' under Behaviour.

FWIW, I have not had to chase 'emulate 3 buttons' for about a decade.
It seems to auto-majikally happen.

for general info, since I too have the random Copy&Paste-Not problem,
this is the hardware in my system. Note, there is only one actual
mouse, but the mechanical keyboard (some versions) actually have
two USB ports and can apparently do fancy things for 'gaming' prposes.
Sadly my fingers no longer can do the same.

user@ system:$ sudo dmesg |grep ouse 
[    1.116309] mousedev: PS/2 mouse device common for all mice
[    2.082995] usb 8-1: Product: Comfort Optical Mouse 1000
[    2.091999] input: Microsoft Comfort Optical Mouse 1000
as /devices/pci0000:00/0000:00:12.0/usb8/8-1/8-1:1.0/0003:045E:00F6.0001/input/input0
[    2.092082] hid-generic 0003:045E:00F6.0001: input,hidraw0: USB HID
v1.11 Mouse [Microsoft Comfort Optical Mouse 1000] on
usb-0000:00:12.0-1/input0 [    2.815090] usb 8-2: Product: Cypress USB
Keyboard / PS2 Mouse [    2.846455] input: Cypress Cypress USB
Keyboard / PS2 Mouse
as /devices/pci0000:00/0000:00:12.0/usb8/8-2/8-2:1.0/0003:04B4:0101.0002/input/input1
[    2.903306] hid-generic 0003:04B4:0101.0002: input,hidraw1: USB HID
v1.00 Keyboard [Cypress Cypress USB Keyboard / PS2 Mouse] on
usb-0000:00:12.0-2/input0 [    2.915473] input: Cypress Cypress USB
Keyboard / PS2 Mouse
as /devices/pci0000:00/0000:00:12.0/usb8/8-2/8-2:1.1/0003:04B4:0101.0003/input/input2
[    2.915542] input: Cypress Cypress USB Keyboard / PS2 Mouse System
Control
as /devices/pci0000:00/0000:00:12.0/usb8/8-2/8-2:1.1/0003:04B4:0101.0003/input/input3
[    2.974950] input: Cypress Cypress USB Keyboard / PS2 Mouse Consumer
Control
as /devices/pci0000:00/0000:00:12.0/usb8/8-2/8-2:1.1/0003:04B4:0101.0003/input/input4
[    2.974995] hid-generic 0003:04B4:0101.0003: input,hidraw2: USB HID
v1.00 Mouse [Cypress Cypress USB Keyboard / PS2 Mouse] on
usb-0000:00:12.0-2/input1