Shutting down PCI devices on suspend

[Matthew Garrett <mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>]

The default PCI suspend/resume calls (used if the driver doesn't
implement them itself) don't alter the device power state. This seems to
cause problems on some Thinkpads - going into S3 doesn't seem to result
in the on-board Radeon being put into D3, and as a result the battery is
drained at a higher rate than it should be. Who should be responsible
for making sure that devices are properly put to sleep:

1) The drivers (not immensely helpful in the case where we don't
necessarily have drivers registered for every device)
2) The kernel
3) The hardware itself?

I seem to remember someone mentioning something about Linux not checking
for hints from the hardware as to what state devices should be put in,
but I know little about this.
-- 
Matthew Garrett | mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org



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