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Problem: Keyboard mouse won't respond after lock Ubuntu 16.04

System Details: Asus X552C Laptop (4 GB RAM,250 GB for ext4, 6 GB for swap space) Mediatech MTK Regular English Keyboard & Logitech Mouse Fresh Install Ubuntu 16.04 LTS

Issue Details: I've set the Screen-Lock for 2 min. After locking, I need to enter the password to unlock the screen.

Intermittently, Alphabet keys on the keyboard just won't respond. I cannot enter the password. Mouse intermittently works, I can click on the right most Arrow button on the password field, which will give me the error message "Invalid password".

On a related note, I installed Sublime Text3, Alphabet keys won't respond, but capslock, tab, enter, Ctrl+C, Ctrl+V works.. All keys work fine in VIM, GEdit, ...

It is tuff to pinpoint the problem to either NVidia Graphics, Xserver-org, ...

Any pointers would be helpful.

Note: I'm only powering off & then powering on the laptop on each occurrence of this issue.

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  • Look at this page. Even being a very old page, it may solve your problem. It's worth trying.
    – Redbob
    Oct 3, 2017 at 12:15
  • Have tried it, put it subtly "It is tuff to pinpoint the problem to either NVidia Graphics, Xserver-org, ...", ......broken packages & too many dependencies within x11-server*, vmmousem ... * nvidia....
    – SMJ
    Oct 3, 2017 at 13:52

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