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On recently upgrading to 12.04, I find that the middle click with my logictec marble mouse doesn't work any more (formally achieved by clicking both buttons). Anoying since I can't do a middle-click paste.

Can anyone think of an easy solution? Or should I file a bug?

(theres's already a launchpad question on this, and here's the oldish ubuntu page for configuring a marble mouse.

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up vote 3 down vote accepted

I found the answer here and here. You need to run the following command:

gsettings set org.gnome.settings-daemon.peripherals.mouse middle-button-enabled true

You only need to do this once - Gnome remebers the setting for your next logon - though you need to do it for each user. If someone knows a way around this, feel free to edit this answer (:

It seems Gnome sets this to 'false' by default, and does so after xorg does it's settings (so it overrides xorg settings in xorg.conf or ...-evdev.conf etc..)

The setting can also be changed with the dconf-editor in the dconf-tools package (thanks Walt). Go to org::gnome::settings-daemon::peripherals::mouse and tick 'middle-button-enabled'.

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No such schema 'org.gnome.settings-daemon.peripherals.mouse'. – Dave Jarvis Mar 24 '13 at 20:04
@DaveJarvis can you provide more info? The above commands all still work for me.. – drevicko Mar 24 '13 at 23:12
I found a work-around: ... Don't know why gsettings couldn't find the schema. – Dave Jarvis Mar 24 '13 at 23:34
@Dave I think I see the difference now: It seems Xubuntu 12.04 LTS running Xfce does not override those X settings, so changing the xorg files works. Looks like the mouse settings have been removed from Xfce/Xubuntu (hence the 'No such schema' error). – drevicko Mar 24 '13 at 23:55

I am experiencing the same problem after updating from 10.04. I have applied the settings to /usr/share/X11/xorg.conf.d/10-evdev.conf as suggested in and this gives the required scrolling using the trackball, but the two-large-button middle-click merely gives a right-click effect.

I have appended the following settings ing 10-evdev.conf:

Section "InputClass"
        Identifier  "Marble Mouse"
        MatchProduct "Logitech USB Trackball"
        MatchIsPointer "on"
        MatchDevicePath "/dev/input/event*"
        Driver "evdev"
        Option "ButtonMapping" "1 8 3 4 5 6 7 2 2"
        Option "EmulateWheel" "true"
        Option "EmulateWheelButton" "8"
        Option "ZAxisMapping" "4 5"
        Option "XAxisMapping" "6 7"
        Option "Emulate3Buttons" "true"

This maps the middle button click to either of the small buttons (8 & 9) and allows the holding down of button 8 (small left button) for the track-ball scrolling. While not ideal (I also prefer the two-large-button==middle-click) this might be a good enough compromise (I think it will be for me at least).

I would also suggest that the loss of Emulate3Buttons is a bug and should be reported. This setting worked fine with this mouse on 10.04.

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Thanks theabro. Doesn't actually answer the question, but its good to have this info here (: – drevicko May 13 '12 at 2:41
That's great drevicko - that now gives the middle-click working on my system. The line Option "Emulate3Buttons" "false" will need to be changed to Option "Emulate3Buttons" "true" for this as well I think. – theabro May 14 '12 at 11:29
yep, it will (: I'll change it in the question now.. – drevicko May 14 '12 at 23:14

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