I solved some of the problems I had:
My computer serves both as a web server and as a personal desktop
computer, so my KDE sessions can be a few days, weeks or months long !
The problem with my sound card is solved and is due to a mistake I did
when I changed the groups my login is part of (wrong use of usermod !)
that was updated on new sessions this morning.
It remains the main issue & the clocksource: I don't know why my system
became instable.
Since then, I reactivated ACPI in BIOS, I have less error/warns messages
during the boot sequence.
I found some tricks on http://kerneltrap.org/node/8306
Some people recommand to use the kernel option clocksource=hpet
Wait & see !
N.
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