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[Bug 41301]

 

I can confirm this issue on a Thinkpad T420, both on a freshly installed
Ubuntu 14.10 and Kubuntu 14.10.

It first occured shortly (but not immediately) after enabling the
touchpad in the bios. Reinstalling the system or running from a live usb
did not fix it.

After disabling the touchpad again in the bios, the problem was gone
immediately.

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https://bugs.launchpad.net/bugs/41301

Title:
  PS/2 Logitech MX310 clicks stop working sporadically

Status in X.Org X server:
  Confirmed
Status in linux package in Ubuntu:
  Incomplete
Status in Debian GNU/Linux:
  Confirmed

Bug description:
  This bug is a long standing one for me in Dapper but it becomes more
  and more frequent in recent Dapper beta.

  Unfortunatly, there's no way I can reproduce it.

  
  Symptoms : the mouse buttons (all of them) stop working without any reason. Seems to happen mainly when surfing with Epiphany but not only.

  
  In fact, it's just like my mouse was in another dimension. I use "focus follow pointer" and it doesn't work anymore. I can see my cursor and moving it : the system just ignore it. No more click, no more focus following pointer.

  Also, the keyboard keeps working perfectly. By using shortcut keys, I
  can continue working normally.

  The workaround to have the mouse again is hopefully very simple :  use
  the change desktop shortcut. The alt-tab shortcut is also working.
  Yes, it's strange, but they are the only two shortcuts I've found that
  bypass this bug ! Strange isn't it ?

  My mouse is a PS/2 Logitech MX310. The workaround seems to be the
  proof that it's not an hardware failure.

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