Re: [ACPI] Re: swsusp and ac status

[Micha F. <mi...@po...>]

On Fri, Jun 25, 2004 at 03:14:22PM -0000, Stefan Seyfried wrote:
> On Fri, Jun 25, 2004 at 07:29:51PM +0800, Michael Frank wrote:
> 
> > >It is NOT in my case. It is one of the first things I did. Now, just
> > >in case, I gave it another try, but it does not work.
> > >
> > >modprobe -r ac
> > >suspend
> > >unplug
> > >resume
> > >modprobe ac
> > >
> > >cat /proc/acpi/ac_adapter/C131/state
> > >state: on-line
> > >
> > >If now, after resuming, I plug and unplug the adapter...
> > >
> > >cat /proc/acpi/ac_adapter/C131/state
> > >state: off-line
> 
> I have exactly the same on a hp compaq nx 5000.
> 
> > 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.
> 
> Pavel and i and some HP BIOS engineers analyzed this problem and pavel
> proposed an ugly hack in his swsusp code to work around this. I have
> to check back in my archives / bugzilla reports for this.
> The funny thing is, that the BIOS is 100% correct and this leads to this
> problem (at least that was what Pavel concluded). HP would have changed
> the BIOS to work around the linux bug, but this would be even more ugly.
> I will dig my archives for more info and a (probably ugly, but maybe
> somehow working) patch. I'm offline on the train now, so this will have
> to wait until monday.
>  
> > I'll compile 2.6 and try it on my HW.
> 
> It is completely hardware dependent, i only saw it on the nx5000 up to
> now.

Also saw this on a sony vaio pcg-fxa53 (via + amd 1300+)
> 
> > Perhaps the ACPI people could advise how to increase debug verbosity
> > to see what happens or if that can't be done, put some printks into AC
> > module to see what happens when the module is loaded on resume.
> 
> I am not even sure that the AC module is to blame, i have to check
> my archives, i don't remember all the gory details.

For me compiling battery as a module and unloading/swsusp/resume
bypasses the problem.

> -- 
> Stefan Seyfried
> 
> 
> 
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