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Yesterday, suddenly my touchpad on my MSI Laptop started to not respond. In other words, in Login screen, touchpad is working as expected. However, in Desktop screen, after I have logged in, touchpad is not working.

How can I enable touchpad in Desktop?

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Have you tried, the FN + function key combination? – Mitch Jul 4 '12 at 7:04
    
Which one ? I am using MSI – user8324 Jul 4 '12 at 8:58
    
@Mitch make this as answer, it works – user8324 Jul 4 '12 at 9:39
up vote 2 down vote accepted

Make sure that the Touchpad is enabled. On an MSI laptop to Enable or disable the touchpad: FN+F3.

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I don't recall having this problem in 12.04 either but running the gpointing-device-settings command and unchecking Disable touchpad always did it for me in 11.10.

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I have tried but touchpad is still not work – user8324 Jul 4 '12 at 8:54

I accidentally disabled my touchpad. This is the way I found to re-enable it.

Press the "Windows key" to open the start menu. Type "terminal" and enter, to open the command line.

Then type:

xinput list

Find the 'id' of your touchpad. For me it looks like this:

Virtual core pointer                        id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ TPPS/2 IBM TrackPoint                     id=12   [slave  pointer  (2)]
⎜   ↳ SynPS/2 Synaptics TouchPad                id=11   [slave  pointer  (2)]

My touchpad has id = 11.

Then type

xinput set-prop 11 "Device Enabled" 1

(but replace 11 with whatever id your touchpad had)

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You could try the following command in a terminal and see if it helps, I always used it to restart the touchpad on 11.10 when it stopped working, but I have had no problems on 12.04.

synclient Touchpadoff=0
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I have tried but touchpad is still not work – user8324 Jul 4 '12 at 8:53

I have had the same problem but I found the fix for mine to be very simple. I unplugged my mouse out of the USB port on the laptop and the touchpad immediately started working again. It disables the touchpad when you have a mouse plugged in. My Laptop's model is the MSI Apache Pro-012 (GE70)

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I know this is an old post but in case anyone has this problem, type

synclient TapButton1=1 

problem solved.

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This enables tapping once on the touchpad to be seen as left clicking. It won't help with enabling the touchpad itself. – muru Feb 14 at 13:47

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