And I thought 64-bit Linux was ready

After I bought myself a new Dell D820 laptop with a Core 2 Duo chip, I thought I'd finally be able to run Linux in 64-bit mode. Not quite. I tried Ubuntu Edgy, Fedora Core 6, Debien Etch (testing), all of which where totally unusable due to strange X freezes and random crashes. After searching for a while, I finally find out that adding "notsc" works around some kernel bug. Good, so I give Edgy another try and indeed the strange X freezes are gone. Unfortunately the random crashes are still there... and they're not quite random. Turns out that any ACPI event (closing the lid, unplugging the AC adapter) simply crashes the machine before it can even print a panic(). Not good! So in the mean time I'm stuck in 32-bit world waiting for a 64-bit distro that would finally support my machine. If anyone managed to run a 64-bit distro on a Dell laptop with a Core 2 CPU, please leave me a note.

Updated: Looks like adding the no_timer_check option solves the problem. Haven't dared trying suspend yet, but it's already much better than crashing every time I plug/unplug the ac adaptor!
Update #2: Not quite perfect though. Closing the lid makes the screen go blank (never turns back on) and docking/undocking crashes the X server (go figure).