> Despite this, were you able to boot without the parameters in a release prior to Quantal?
No, I was not able to boot without acpi parameters on any amd64 release of Ubuntu (starting from Natty).
But I would like to admit, that i386 kernels are booting without any acpi parameters on my machine (At least this was true for Natty). I can re-check with current i386 Live-CD if needed.
> Despite this, were you able to boot without the parameters in a release prior to Quantal?
No, I was not able to boot without acpi parameters on any amd64 release of Ubuntu (starting from Natty).
But I would like to admit, that i386 kernels are booting without any acpi parameters on my machine (At least this was true for Natty). I can re-check with current i386 Live-CD if needed.