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I have upgraded to ubuntu 12.10 recently and found some issues.

  1. Mouse keeps disappearing randomly. It appears when we move the mouse.
  2. Brightness control not available in brightness&lock in system settings.

I tried some fixes but was not successfull. For the brightness issue tried changing to

  GRUB_CMDLINE_LINUX="" into GRUB_CMDLINE_LINUX="acpi_osi=Linux".

3. But its not working.

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Welcome to Ask Ubuntu! Please keep the number of questions in your post to one. This is how the site works. Also, what do you mean by your mouse disappearing? It hides behind your monitor being scared of you? Or do you mean the mouse pointer on your screen not visible? Please be more specific about your issue and consider posting them as single ones (edit this one). –  gertvdijk Jan 17 '13 at 11:13
    
@gertvdijk: The mouse cursor gets hidden once the movement stops. –  user123928 Jan 17 '13 at 11:27
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