After spending a few fruitless hours trying to upgrade a Toshiba Satellite
A35-S159 from XP to Vista HP, I found that both the MS Vista Upgrade Advisor
and the Vista upgrade install that is launched from within XP falsely
indicate that this upgrade is possible. If you proceed, you will be greeted
with an 0x000000A5 blue screen informing you that the BIOS is not fully ACPI
compliant, even though you have the latest and supposedly greatest BIOS, v1.8
for this model, which was built in 2003.
To isolate it to the BIOS, I swapped out the customer's hard drive for a
known good one, booted from the Vista DVD and got the same error at the end
of the initial text-mode "copying files" phase. Since Toshiba is famous for
using proprietary power management in its laptops, I suspect that they are
using proprietary ACPI extensions in the Phoenix BIOS and Vista setup has a
problem with this. Unlike Win2k/XP, there does not appear to be the
opportunity to press F7 to disable loading the ACPI hal overlay - I tried it
anyways during the "copying files" phase and no joy.
Since I was not aware that Vista was pickier about ACPI implementations that
XP, I didn't go looking beforehand, but if you go to Toshiba's website, there
is a list of machines that will support upgrading to Vista, at:
Since Vista setup obviously can detect problems with the ACPI implementation
when it gets to that point, I wonder why this check has not been added to the
Upgrade Advisor, or to the compatibility check phase of setup that is
launched from within the previous version of windows.
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