Re: 2.6.18-rc4 (and earlier): CMOS clock corruption during suspend to disk on i386

Pavel Machek
2006-08-10T00:12:45Z

Hi!

> > > > > It looks like the CMOS clock gets corrupted during the suspend to disk
> > > > > on i386. I've observed this on 2 different boxes. Moreover, one of them is
> > > > > AMD64-based and the x86_64 kernel doesn't have this problem on it.
> > > > >
> > > > > Also, I've done some tests that indicate the corruption doesn't occur before
> > > > > saving the suspend image. It rather happens when the box is powered off
> > > > > or rebooted (tested both cases).
> > > > >
> > > > > Unfortunately, I have no more time to debug it further right now.
> > > >
> > > > Do you have Linus' "please corrupt my cmos for debuggin" hack enabled?
> > >
> > > Well, I know nothing about that. ;-)
> >
> > CONFIG_PM_TRACE=y will scrog your CMOS clock each time you suspend.
>
> Oh dear. Of course it's set in my .config. Thanks a lot for this hint. :-)
>
> BTW, it's a dangerous setting, because some drivers get mad if the time after
> the resume appears to be earlier than the time before the suspend. Also the
> timer .suspend/.resume routines aren't prepared for that.

Its config option should just go away. People comfortable using *that*
should just edit some header file. Rafael, could you do patch doing
something like that?

--
Thanks for all the (sleeping) penguins.