Comment 143 for bug 531190

Actually this is fixed for me - see bug 852406. It was an upstream kernel workaround for bad ACPI events sent by the hardware. I really wouldn't blame the Ubuntu developers for that, as fixing any bug of this sort (of which there are far too many) takes an enormous effort - see all the comments on these bug tickets, many of which are actually users actively working to track down the problem, and it involves hardware they may not own and a component (the kernel) which they package but certainly didn't develop themselves.