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[Bug 947443] [NEW] Ubuntu 12.04 Beta 1 desktop freezes


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>From time to time the Ubuntu desktop just freezes on me, and I cant use
the keyboard nor the mouse.  I looks like it happens when I have many
tabs open in Firefox, but it can also happen when I use other programs
(like Gnome Image Viewer). When it freezes I might be able to use
CTRL+Alt+F4 (when I press several times) so I can shut the pc off with
"shutdown -r now" command. If not my only option is to turn the power
off (I lose all my work when this happens).

I have a clean install of Ubuntu 12.04 Beta 1, and I have not installed
the proprietary AMD graphic driver.

This also happened when I tried out the Ubuntu 12.04 Alpha 2 on the same
pc. But when I installed and used the xbuntu-desktop on Ubuntu 12.04
Alpha 2 it worked just fine - so it must be something with the Unity
stuff (or compiz). This have never happens before on my pc (I have used
previous versions of Ubuntu on the same hardware).

Some of my hardware:
Intel Core 2 Quad
AMD Radeon HD 5870

I do not know how to read log files - but I can post them if you tell me
where to look.

Thanks for reading.

** Affects: compiz (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Tags: precise
Ubuntu 12.04 Beta 1 desktop freezes
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