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). ** Attachment added: "Information after booting with acpi=off." https://bugs.launchpad.net/ubuntu/+source/linux/+bug/997767/+attachment/3459786/+files/scenario_acpioff.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/997767 Title: 10ec:8139 Network connection rtl8139 lost after some hours of inactivity and comes up again on user interaction To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/997767/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
