I did what you requested.  Note that the boots were about 20 minutes
apart.  I have learned to move the mouse pointer over the Options box on
the log in screen.  If it changes color, the boot worked, and I go ahead
and log in.  If it doesn't, I use the keyboard to reboot and try again.
The first boot today had the mouse problem, and I created the _fail
attachments from this.  I then rebooted, and again got the problem.  The
mouse worked properly on the third boot, from which I made all the other
attachments, and am still in.  Thus it took 3 boots today to get the
mouse to work.  Over the last month I have had to boot 65 times to get
19 sessions where the mouse worked; thus it works on average,  29% of
the time.  The most took 8 boots in a row before the mouse worked;
several times it worked on the first boot.

I now keep a PS/2 mouse attached to the computer as well, for when I
boot into DOS.  I haven't tested this thoroughly, but I believe that
either both devices work in a given boot or both don't.

Looking at a diff of the _fail and _ok attachments, I don't see anything
that looks off to me, but then you're the experts.  For your
convenience, if desired I have attached a diff output of the dmesg
files, with the actual changes highlighted in color, blue for the fail,
yellow for the ok file.  The differences in the brackets at the
beginnings of lines (which I presume are time stamps) are ignored.  The
color controls are for an xterm terminal.  Some of the lines are out-of-
order between the boots, but are otherwise identical.  These show up in
the diff as deleted and inserted lines.


** Attachment added: "diff (with colors added) of dmesg_fail and dmesg_ok"
   http://launchpadlibrarian.net/8746505/dmesg_diff

-- 
Intermittent mouse flakiness (works on some boots)
https://bugs.launchpad.net/bugs/120043
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