Comment 28 for bug 882817

I have an HP dv6 1350us laptop, which is a couple years old. I had originally installed Ubuntu 11.04 as a fresh install, and then upgraded to 11.10 via going to a dev branch originally and updating periodically. When we got near the RTM release date, this started happening to me as well and hasn't gone away. I suspect it has something to do with ACPI and here is why: if the laptop is unplugged and is running off the battery, it has never happened to me. If the laptop AC adapter is plugged in, it happens most of the time.