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[Launchpad Bug Tracker <1076393@xxxxxxxxxxxxxxxxxx>]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: unity (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1076393

Title:
  Unity freezes when a program uses a lot of CPU and I hover an item on
  the launcher

Status in Compiz:
  New
Status in Unity:
  New
Status in “compiz” package in Ubuntu:
  Confirmed
Status in “unity” package in Ubuntu:
  Confirmed

Bug description:
  When an application suddenly starts using a lot of CPU (e.g. when I
  import the favourites with Firefox from a big HTML file), Unity thinks
  that the program doesn't respond to commands, and the window becomes
  gray. Though, if I click a button in the window, it works. But if I
  move the pointer on the launcher while the window is gray, Compiz
  stops responding, the window becomes unresponsive but there isn't any
  hard disk activity. I can move the mouse and switch to a TTY. If I run
  "top" in the tty, I don't see any strange activity. If I kill compiz
  and start another window manager (like Metacity), I can continue using
  the program: I'm reporting the bug with Firefox and Metacity...

  Another user noticed this behavior, so I made a python script for him
  to analyze the activity with Unity and KDE while Chrome is starting.
  Look at the attachments. "Memoria" means "Memory", "Utilizzo CPU"
  means "CPU usage", "Rete"= Network, Trasmessi=sent, Ricevuti=received,
  "Variazione dei processi" is the diff between two instances of "ps",
  "Utilizzo risorse da parte di Compiz" was meant to monitor compiz, but
  it didn't work.

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