Ubuntu 18 unity - keyboard (not mouse) freeze, lightdm restart borks system











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I'm having the following problem within Unity in Ubuntu 18




  • after a while the keyboard becomes non responsive (sometimes, prior to this it behaves like a mouse button is stuck down and mouse movement drags to hightlight text).

  • the mouse moves and the window manager is responsive to it (mouse-hover actions are highlighted)

  • I can CTRL+ALT+F2 to switch to a different user via the usual Ubuntu graphical user login. The keyboard words here to type the user's password, and works within the other user's sesssion

  • if I switch back to the first user, keyboard is broken again.

  • restarting lightdm from the other user breaks the system, and I need to reboot. (I can enter the user's login, something breaks and I'm kicked back to login and need to reboot).


I think we can rule out hardware problems.
Seems like the X-server works OK, since I can switch user.



Ideas on the problem? How to resolve?



Is with Dell XPS 15 9560 laptop.










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    up vote
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    down vote

    favorite












    I'm having the following problem within Unity in Ubuntu 18




    • after a while the keyboard becomes non responsive (sometimes, prior to this it behaves like a mouse button is stuck down and mouse movement drags to hightlight text).

    • the mouse moves and the window manager is responsive to it (mouse-hover actions are highlighted)

    • I can CTRL+ALT+F2 to switch to a different user via the usual Ubuntu graphical user login. The keyboard words here to type the user's password, and works within the other user's sesssion

    • if I switch back to the first user, keyboard is broken again.

    • restarting lightdm from the other user breaks the system, and I need to reboot. (I can enter the user's login, something breaks and I'm kicked back to login and need to reboot).


    I think we can rule out hardware problems.
    Seems like the X-server works OK, since I can switch user.



    Ideas on the problem? How to resolve?



    Is with Dell XPS 15 9560 laptop.










    share|improve this question


























      up vote
      2
      down vote

      favorite









      up vote
      2
      down vote

      favorite











      I'm having the following problem within Unity in Ubuntu 18




      • after a while the keyboard becomes non responsive (sometimes, prior to this it behaves like a mouse button is stuck down and mouse movement drags to hightlight text).

      • the mouse moves and the window manager is responsive to it (mouse-hover actions are highlighted)

      • I can CTRL+ALT+F2 to switch to a different user via the usual Ubuntu graphical user login. The keyboard words here to type the user's password, and works within the other user's sesssion

      • if I switch back to the first user, keyboard is broken again.

      • restarting lightdm from the other user breaks the system, and I need to reboot. (I can enter the user's login, something breaks and I'm kicked back to login and need to reboot).


      I think we can rule out hardware problems.
      Seems like the X-server works OK, since I can switch user.



      Ideas on the problem? How to resolve?



      Is with Dell XPS 15 9560 laptop.










      share|improve this question















      I'm having the following problem within Unity in Ubuntu 18




      • after a while the keyboard becomes non responsive (sometimes, prior to this it behaves like a mouse button is stuck down and mouse movement drags to hightlight text).

      • the mouse moves and the window manager is responsive to it (mouse-hover actions are highlighted)

      • I can CTRL+ALT+F2 to switch to a different user via the usual Ubuntu graphical user login. The keyboard words here to type the user's password, and works within the other user's sesssion

      • if I switch back to the first user, keyboard is broken again.

      • restarting lightdm from the other user breaks the system, and I need to reboot. (I can enter the user's login, something breaks and I'm kicked back to login and need to reboot).


      I think we can rule out hardware problems.
      Seems like the X-server works OK, since I can switch user.



      Ideas on the problem? How to resolve?



      Is with Dell XPS 15 9560 laptop.







      unity keyboard lightdm






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      edited Nov 30 at 15:21









      Zanna

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      49.3k13126236










      asked Nov 28 at 19:40









      user48956

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          It turns out that simply tapping touch screen fixes this issue.






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            It turns out that simply tapping touch screen fixes this issue.






            share|improve this answer

























              up vote
              1
              down vote













              It turns out that simply tapping touch screen fixes this issue.






              share|improve this answer























                up vote
                1
                down vote










                up vote
                1
                down vote









                It turns out that simply tapping touch screen fixes this issue.






                share|improve this answer












                It turns out that simply tapping touch screen fixes this issue.







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 29 at 18:10









                user48956

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