K 10
svn:author
V 3
njl
K 8
svn:date
V 27
2005-10-25T21:15:47.000000Z
K 7
svn:log
V 642
If we're trying to use C2/3 and reads from the register are returning
immediately, back off to the next higher Cx sleep state.  Some machines
with a Via chipset report a valid C3 but a register read doesn't actually
halt the CPU.  This would cause the machine to appear unresponsive as it
repeatedly called cpu_idle() which immediately returned.  Causing interrupts
(i.e. by pressing the power button) would cause the system to make forward
progress, showing that it wasn't actually hung.

Also, enable interrupts a little earlier.  We don't need them disabled
to calculate the delta time for the read.

Reported by:	silby
MFC after:	2 weeks

END