Re: Re: [Swsusp-devel] swsusp and ac status

["Michael Frank" <mhf-jjFNsPSvq+iXDw4h08c5KA@public.gmane.org>]

On Mon, 28 Jun 2004 08:13:00 +0800, Michael Frank <mhf-jjFNsPSvq+iXDw4h08c5KA@public.gmane.org> wrote:

> On Mon, 28 Jun 2004 00:28:42 +0200, Karol Kozimor <sziwan-DETuoxkZsSqrDJvtcaxF/A@public.gmane.org> wrote:
>
>> Thus wrote Michael Frank:
>>> Too bad, this implies that the AC module does not get reinitialized after
>>> resume and I suspect that acpi core is broken on 2.6 in this regard.
>>
>> As far as I know, there is no need to reinitialize the AC module, as it
>> does not cache the results -- upon read, it calls the appropriate _PSR
>> method which is supposed to return the correct AC adapter state, as simple
>> as it gets. This way, any problems would indicate a faulty BIOS.
>> Best regards,
>>
>
> Sorry, the BIOS does not know about suspend.
>
> Please consider It just booted cold and the resuming kernel
> without any ACPI modules won't have touched the AC method.
>
> ----> Thus the BIOS is now in a post boot state, like before
> 	vmlinux starts on boot!

To clarify

  ----> Thus the BIOS is now in a post boot state, like _after_
  	vmlinux started on boot! and BIOS AC adapter interface
	is unchanged from pre-boot.
>
> ----> The resumed kernel is in the state it was upon suspend.
>
> Therefor IMO cause is the kernel which was resumed and
> continues to talk to the BIOS which is in a state quite different
> than what it was pefore suspend...
>
> I concur that the BIOS in this case may break, but as it worked
> prior to suspend it cannot be blamed for not handling such abuse.
>
> A simple solution is for the resumed kernel to  start talking to
> BIOS as it would have on a normal boot, perhaps executing
> just a subset of the init code.
>
> If it also would disable all modules prior to suspend, it
> would likely fix all problems eliminating the reuqirement
> to unload ACPI modules....
>
> Best Regards
>
>
>
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