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[Launchpad Bug Tracker <421048@xxxxxxxxxxxxxxxxxx>]

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On logging in to Ubuntu, sometimes there are randomly placed black dots
on the screen. I have seen this problem on an old Hardy install on a PPC
and on my current Intrepid install running on an Intel Q9550. Another
machine with Intrepid on an Athlon has never exhibited this problem. All
were 64-bit installs.

The dots are black pixels and not window or virtual desktop dependent
(they remain in the same place regardless of what the OS draws on
screen). Occasionally some may appear or disappear and sometimes they
all go away and return at random times.

I have discovered that simply logging out of the session and logging
back in to X clears this problem (I have had many weeks of uptime after
this, so am certain that it is a permanent fix).

The dots do not affect any function of the OS, and can be fixed (for me)
by restarting X (as above), but they are an unnecessary ugliness for
those users that are affected.

My guess is that the issue is with the X server - but I am not sure how
to verify this.

There is a thread (784045) about this on the Ubuntu forums (http
://ubuntu-ky.ubuntuforums.org/showthread.php?t=784045)

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New

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Black dots appear on screen
https://bugs.edge.launchpad.net/bugs/421048
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