I have a Dell Latitude E6520 and tried to boot to a live CD of Fedora 15. The boot up was
going fine until midway through and it dropped to a debugging shell with this message.
ehci_hcd 0000:00:1a.0: dma_pool_free ehci_qh, f62b5060/fffff060 (bad dma)
I also tried Fedora 14 live CD and Ubuntu 10.10 with similar results.