Thank you for your help, but I am not able to get a backtrace because system crashes as soon as an USB device is plugged in.
As you can see from bug #50610, this behaviour only occours when ACPI BIOS is disabled. I heard about a related kernel bug, but a Debian system installed on my PC running the same kernel and hal version is not affected at all. -- crash when plugging in a USB device with the USB 2.0 driver https://launchpad.net/bugs/51771 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
