Comment 88 for bug 997767

Consider that I kept up to date with new Ubuntu kernels, so now I have 3.5.0-19-generic. I attached the output of the acpi=off.

The last lines in the dmesg for acpi=off are related to an USB hard disk plugged in when booting and a usb mouse plugged after boot: that is interesting because I discovered that sometimes when plugging I get those ehci error messages, sometimes I don't and a couple of times I even got the mouse to work (badly, movement was not smooth).