Re: PCI power state mapping

[Pavel Machek <pavel-AlSwsSmVLrQ@public.gmane.org>]

Hi!

> >>  Suspend to disk works fine. It's just the ram-bit that won't work.
> >>  There is an earlier thread about this with more details (search for
> >>  "suspend-to-ram hangs on HP NX7010"). I haven't bothered making a
> >>  patch of my changes since they do not add any functionality. If you
> >>  have a look at pci_device_suspend() it's fairly easy to change it.
> >>  It's a very compact and obvious function.
> >>   
> >>
> >
> >Why do you think it is a driver problem? I have nx5000 here, it fails
> >to suspend, too, but I suspect some ACPI weirdness. Similar problem is
> >there on compaq 620c, btw.
> >
> That depends on how you define a problem. But as I see it there can only 
> be two reasons that the suspend fails. Either the ACPI implementation or 
> one of the drivers is not up to spec. or the system relies on some 
> "feature" present in Windows. Not being bug-for-bug compatible with 
> Windows might not constitute a problem in the driver per se but can 
> still cause undesired behavior.
> 
> Suspending all devices, not just those with well behaved drivers, was 
> one thing that seemed reasonable to try. The next step would be manually 
> putting devices into the states specified in the _SxD fields. But I 
> haven't got the "state" files under sysfs to work yet...

Aha, okay, I see now.

I believe it is "ACPI implementation is not up to spec or or the
system relies on some "feature" present in Windows.". It might make
sense to try noapic (but it does not help here).

Hmm, strange.

My nx5k has "interesting" bios feature when it enters some kind of
bios-based-suspend-to-RAM upon pressing fn-F3... But it only works as
long as you keep accessing disk (yes, strange!). It works at grub
prompt, too (even without disk accessing). If disk is not accessed,
normally nothing will happen, but with "noapic nolapic" it will freeze
machine in similar way "echo 3 > /proc/acpi/sleep" will.
								Pavel
-- 
People were complaining that M$ turns users into beta-testers...
...jr ghea gurz vagb qrirybcref, naq gurl frrz gb yvxr vg gung jnl!


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