I am trying to use Enhanced Intel SpeedStep in Linux on my laptop
that has a A100 processor. But the processor reports (by CPUID) that it does
not support Enhanced Intel SpeedStep.
According to "Intel 64 and IA-32 Architectures Software Developer's Manual
Volume 3A: System Programming Guide", I use CPUID instruction with
EAX=1, and check ECX bit 7, but it has zero value. The whole value of ECX is zero.
According to "Intel Processor A100 and A110 on 90 nm Process with 512-KB L2 Cache Datasheet" section 2.2, A100 processor supports Enhanced Intel SpeedStep.
How can I check that A100 processor supports Enhanced Intel SpeedStep?