I think the bug description solved a mystery I was faced with: I have an
old HP Pavilion 6630
(http://h10025.www1.hp.com/ewfrf/wc/document?docname=bph05258&lc=en&cc=us&dlc=pl&product=59927&lang=pl)
with the most-up-to-date BIOS available (FresnoCognac_307) and its
onboard video chip (Intel) is starting to have minor video jitters, so I
wanted to add a new video card.  The computer only has PCI slots, so
that's what I added and then disabled the onboard one in the BIOS (or at
least, that's what the BIOS said).  I had forgotten to switch the video
cable to the card and the computer beeped furiously at me when I tried
to boot it up, so I quickly switched it to the card and it appeared to
begin booting no problem...

Unfortunately, Ubuntu wouldn't finish booting.  A Live CD wouldn't fully
boot up either.  Booting from the HD with safe graphics got me to a root
command prompt where I could run dpkg-reconfigure xserver-xorg and it
was then that I noticed that when it autodetected the video, it was
choosing the onboard Intel instead of the S3 ViRGE-based card.  lspci
showed me that the S3 was located at "01:0e.0" and so I eventually got
it working (though the S3 had its own problems :) but I couldn't figure
out why it didn't automatically detect the S3 as the working shipset.
Apparently its a BIOS issue.  Too bad X doesn't just recognize what
chipset its directly plugged into ;)

-- 
wrong primary display selected in multihead setup (PCI bus enumeration order)
https://bugs.launchpad.net/bugs/55928
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