Originally Posted by zander
The 256.25 BETA driver release does not yet include a fix for the ACPI related Powermizer problems I referred to earlier. However, I hope the next 256.xx BETA driver release will.
If it is an ACPI related problem, as you state, would turning off ACPI in the Linux kernel (acpi=off) help?
Of course one would lose all the power saving features and possible the core i7 C3 sleep state that enables the other cores to increase their clock rates. But still we need that GPU power rather sooner than later!