The udev .rules file causing the problem is:
/etc/udev/rules.d/90-modprobe.rules

Specifically, this rule:
[code]# Load drivers that match kernel-supplied alias
#ENV{MODALIAS}=="?*",                   RUN+="/sbin/modprobe -Q 
$env{MODALIAS}"[/code]

In disabling this rule, I noticed an immediate effect - my onboard sound
is not loaded. There may be other effects that I'm not aware of yet, but
we'll see. I'm not familiar with the backend of Linux, but perhaps the
"kernel-supplied aliases" need to be updated to support the ATI Radeon
9250?

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Cannot boot when video adapter set as PCI in BIOS
https://bugs.launchpad.net/bugs/128421
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