Matt Whitlock's debounce patch for input-evdev, updated to work on input-evdev-2.92
This eliminates a minor annoyance I have had to live with for years, namely always having a mouse with a "bouncing (multiple hit) key. Seems I always do.
Matt Whitlocks original posting is here: http://lists.x.org/archives/xorg-devel/2012-August/033225.html
I actually followed the excellent instructions posted here: http://blog.guntram.de/?p=16 However the patch doesn't work with the current source code, so I have updated it, working fine here. For the sake of completeness I will summarize the instructions here, but refer users to the original instructions at http://blog.guntram.de/?p=16 (these instructions are heavily adopted from that source)
Do note however the setting command line I suggest below for consistent operation.
Acquire the source code and patch with this patch using
patch -p 1 < ../evdev-debounce-2.92.patch
(Note: I use Funtoo and simply put it in /etc/portage/patches/x11-drivers/xf86-input-evdev directory and emerged it)
compile and install input-evdev. You will also have to install xinput if you don't have it already. Once installed it does nothing until you set the parameters with xinput.
At the command prompt run xinput --list
This will give a list of all of your input devices. Find the listing referring to the mouse you wish to debounce
and make a note of the id number.
Here is an example from my computer:
$ xinput --list
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ Logitech USB Receiver id=6 [slave pointer (2)]
⎜ ↳ MCE IR Keyboard/Mouse (meson-ir) id=9 [slave pointer (2)]
⎜ ↳ lircmd id=10 [slave pointer (2)]
⎜ ↳ Logitech MX5000 Keyboard id=11 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
⎜↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
⎜↳ meson-ir id=7 [slave keyboard (3)]
⎜↳ cec_input id=8 [slave keyboard (3)]
In my case the third item, Logitech USB Receiver is the (wireless) mouse, id=6
Now run xinput --list-props <id number from last step> at the command line. Another example from my computer:
$ xinput --list-props 6
Device 'Logitech USB Receiver':
.....
Evdev Debounce Delay (267): 20
.....
Giving environment property item 267 for the debounce variable. As shown, I have assigned 20 (milliseconds) to this value, as suggested by Guntram and works great for me. Finally, Guntram suggests adding this line to your startup (.xinitrc, .xprofile, whatever) file:
xinput --set-prop --type=int --format=32 <id> <debounce property variable number> <desired delay in milliseconds>
But I found that on occasion my id number and even the debounce variable number would be different, so I recommend this line, which will always pick the right incantation:
xinput --set-prop --type=int --format=32 $(xinput --list|grep "USB Receiver"|cut -d "=" -f2|cut -f1) $(xinput --list-props 6|grep Debounce | cut -d "(" -f2|cut -d ")" -f1) 20
Note that you will have to change "USB Receiver" to some value that grep will uniquely find for your mouse and replace the "20" at the end with your desired delay value.
The fix will be in place immediately upon running xinput --set-prop... and on subsequent startups.