http://bugzilla.kernel.org/show_bug.cgi?id=6689
[EMAIL PROTECTED] changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |acpi-
| |[EMAIL PROTECTED]
| |et
Status|NEEDINFO |REJECTED
Resolution| |DOCUMENTED
------- Comment #11 from [EMAIL PROTECTED] 2007-12-30 22:11 -------
The HW guys filled me in on this one...
Yes, theoretically it is possible to do non-snooped AGP/memory transactions
while in C3 w/o waking the processor. However, the processor+chipset
at hand does not distinguish between snooped and non-snooped AGP
transactions for the purpose of notifying the processor of AGP activity.
So any AGP/memory activity will indeed keep the processor out of C3.
The HW guys expressed surprise that just loading the driver
caused constant activity that disables C3. To me this suggests
that there may be room for software optimization to reduce
activity, increase C3 residency, and save power.
I think the ACPI C3 question is answered, so this bug is closed.
You may want to take up this issue with the graphics folks
to see if they can optimize their software for power.
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