I experience the same problems on the MD41300 right now on Feisty. It
freezes very often a day (sometimes even every few minutes).

I wonder if this could be solved by simply booting with "nosmp"? (or add
"ht=off", because it shows 2 CPUs in System Monitor even you said HT is
disabled by default)

I tried already disabling Hyperthreading in BIOS. Only one CPU showed up
in System Monitor and everything worked fine but my wireless connection.
It did not work anymore (Prism54/isl3890 card with ndiswrapper): it
connects to the AP and then looses connection again and again. By the
way, booting in Windows with HT disabled heats up my CPU very much when
running mutliple programs.

I will try to reinstall (I am running Debian Etch by now for half a day
and it seems stable, but I do not like it as much as Ubuntu) Ubuntu
Feisty Fawn with Hyperthreading disabled, then add the "nosmp" option
and turn HT on again. Hopefully everything will work fine then.

Does this seem to be a useful workaround to try? Thanks in advance.

-- 
Kernel instabilty on Medion MD41300 with Hyperthreading enabled / Mobile 
Pentium 4 HT 3.06Ghz
https://bugs.launchpad.net/bugs/67110
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