Re: acpi-20040715: functional regression on ASUS M2N

[Nathan Bryant <nbryant-p32f3XyCuykqcZcGjlUOXw@public.gmane.org>]

Georg C. F. Greve wrote:

> Here is what it said for my machine during resume from suspend to ram:
> 
>   i8259: saving ELCR: 0xfffffff0 0x0a

Interesting. That translates into the following IRQ's set to level trigger:

4
5
6 (!) floppy controller?
7
9
11

But I don't think there's anything wrong with that. It does seem that 
Matthew Garrett's message holds the key:

He wrote:
> On Thu, 2004-08-05 at 14:49 -0400, Nathan Bryant wrote:
> 
> 
>>> The ELCR save/restore patch is causing regressions for some people. What 
>>> if the problem is that we're saving/restoring registers at the wrong time?
> 
> 
> On closer investigation, I found that the system was restoring my ioapic
> state /after/ it had started the programmable interrupt timer back up.
> Changing line 310 of drivers/base/sys.c to list_for_each_entry_reverse
> seems to have greatly improved my ability to suspend and resume (which
> worked fine before the interrupt controller suspend/resume patches,
> except that I didn't get many interrupts...) 
> 
> There doesn't seem to be any fine-grained way to control the order of
> suspend/resume for individual drivers. It seems to be assumed that
> everything that devices depend on will be higher than them in the tree,
> and so everything will "just work" - I'm not sure this is true. As
> another example, I just had my wireless card fail to resume correctly.
> It tried to do a hotplug firmware load on resume. Which was difficult,
> because it was resumed before the IDE interface was. How can this sort
> of thing be avoided?
> 
> -- Matthew Garrett | mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org 




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