Clean install OK but upgrade not

[Darek Borkowski]

Hi,

can somebody explain me why the upgraded system can make problems
while clean installed not.
As far as I know the files are repalced during upgrade (rpm -U *.rpm),
so everythink should go well but it go wrong (examples: ALSA problems
with intel85x chipset in my laptop, giant problems with
gnomes-session, etc).
Why upgrade can make things so broken?
And how it is that KDE does not present such problems at WM start, as
Gnome presents. (KDE starts ALWAYS, even after system crash, files
lost, upgrade)?

Darek Borkowski