Re: RTC problem on 8208CA
reassign 277298 util-linux
tags 277298 sarge
thanks
The implemention of a user-space timeout for buggy RTC chips,
suggested by Paul Gortmaker, is in the hwclock supplied
by util-linux as of 2.12b-1 (upstream as of 2.12a). This
appears to be in unstable but not sarge. Accordingly
I am reassigning this bug to util-linux and marking it sarge.
On Tue, May 03, 2005 at 08:25:41PM -0700, Paul Gortmaker wrote:
> At a glance this sounds like the case of having the HPET enabled causes
> the RTC IRQ functionality to become crippled or non-functional. The
> concept of hwclock using alarm or similar to handle broken and
> misconfigured hardware is a sensible idea.
>
> Paul.
>
> --- Horms <horms@verge.net.au> wrote:
>
> > Hi,
> >
> > I am doing some investigations into a problem that has been reported
> > with RTC on some Dell Machines. It seems to be relate exclusively to
> > machines that have the 8208CA ICH3 I/O Hub. I have been able to
> > reproduce this on a Dell 8400, which I have access to today while I am
> > on holidays. The output of lspci -v -x is attached.
> >
> > For reference this problem is being tracked at
> > http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=277298
> >
> > There are various user-space work arounds for this problem, but I would
> > like to offer what I have discovered from a brief poke-around in rtc.c.
> >
> > An strace of hwclock looks a bit like this
> >
> > open("/dev/rtc", O_RDONLY|O_LARGEFILE);
> > ioctl(3, RTC_UIE_ON, 0);
> > read(3, ...
> >
> > the read never returns.
> >
> > If my reading of the code is correct, what is occuring is that
> > rtc_read() is in its do/while loop, waiting to be rescheduled. This
> > should occur once an interupt is handled by rtc_interrupt(), but I guess
> > that this is not occuring. Any insights into why this might be happening
> > would be more than welcome.
> >
> > The kernel in question is Ubuntu's 2.6.8.1, the rtc.c is identical from
> > what was in linus' tree this morning. The config is also attached.
> >
> > Please CC me on replies
> >
> > Thanks
> >
> >
>
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--
Horms
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