503+ reboot problem W98/Linux

Last week I changed some BIOS settings that I now discover
that I am unable to reboot between W98Se/Linux. Shutdown is
OK but because I have a dual-boot W98SE/Linux setup where
a reboot/shutdown is fine from Linux to W98SE but not from
a soft re-boot of W98SE to Linux.

As far as I am aware all BIOS settings are now as they were
last week, and after a few tries I now find whatever caused this
seems to have cleared. Very odd! and now it seems the re-booting
problem has returned after getting Linux to boot in normal mode ?
I did think that as using an AT power supply that changing in
BIOS "PM Control by APM yes/no" might be the problem ?
as I have seen reference to APM when Linux is booting.

Power Management is and always has been disabled.
After a lot of testing(1) I find that PM control by APM set to "no"
seems to have cleared this problem any confirmation on this setting.?
Though the manual says APM yes for both AT & ATX power supply.

Den
(1) trial and error guessing.



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