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I am using Xfce 4.12 and my keyboard and touchpad tapping and right click on touchpad gets stuck all of sudden but the left button on the touchpad is OK.

After I logout and login again the problem disappears.

I tried plugging in a USB mouse to check if the problem is specific to my laptop keyboard and touchpad. But, even when I plugin the mouse, the mouse is able to move, but the right click did not work. Only the left click worked. So, there seems not to be any problem with the hardware.

This happened several times. I have gone through /var/log/Xorg.0.log file and also the Xorg.0.log.old file and also possible through the kernel log file. But I didn't find any errors there.

I am using Dell Inspiron laptop. In Xorg.0.log file, there is an input device called Dell WMI Hotkeys. I suspect if there is some problem with it.

I am using Linux Mint 18 Xfce.

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Had the same problem. The ribbon connector from the keyboard/pad is likely loose. Easy fix once reseated.

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    I can understand that a loose connector can cause an intermittent problem — but a problem that always disappears when the user logs out and logs in again, and never disappears at a random time?  It seems unlikely that this is the OP's problem.
    – G-Man Says 'Reinstate Monica'
    Commented Dec 3, 2016 at 7:08

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