Unfortunatelly that's where everything points at. The DSDT table (surprise, surprise) might be buggy (surprise, surprise). From what I read here: <a href="http://www.al-najjar.co.uk/">http://www.al-najjar.co.uk/ </a> <div> it's most likely that, and of course there is no precompiled DSDT for me to use, so I have to dig myself. Ahhh the good old days are back! Unfortunately I don't have the time to do that so if the crude patch of disabling APIC altogether works for me, I'll stick to it. The only downside is that there is no interrupt balancing between the two CPUs but I can still use the second, which is what matter to me for now. If indeed this works, I'll come back with another posting for the next poor fellow with a Dell XPS... <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> I am not trying to take away blame from Fedora, just suggesting possible alternate problems which could be easier resolved - have you taken a look at your BIOS? Maybe there is an option there which FC4 dealth with better or ignored. A computer that new should have a pretty advanced BIOS setup. -- As a boy I jumped through Windows, as a man I play with Penguins. -- fedora-list mailing list <a href="mailto:fedora-list@redhat.com"> fedora-list@redhat.com</a> To unsubscribe: <a href="https://www.redhat.com/mailman/listinfo/fedora-list">https://www.redhat.com/mailman/listinfo/fedora-list</a> </blockquote></div>