Re: [Linux-ia64] possible bug in the efi real time clock

[Uros Prestor <uros@turbolinux.com>]

Stephane Eranian wrote:

> > On the BigSur B1 stepping with BIOS 60 machine, it crashes when running
> > the hwclock.  Could it be a bug in the efi real time clock?
> >
> Hard to tell from this description. Could you give more details
> like what does appear on the screen ? Could you capture the "tombstone"
> (regs dump) and send it to me. I don't have a Bigsur B1 so I can't
> really reproduce the problem.

What happens is a complete system lockup.  There is no kernel register dump,
panic or oops.  The screen just goes blank.  You can lock up the box by
simply running /sbin/hwclock.

I think this symptom was around for a long time.  On pretty much all the
distributions we shipped you could observe a brief video glitch during the
boot when the system was setting hardware clock.  Usually, the screen would
go blank for a split second and then get switched on again.  Why this would
happen while running hwclock is beyond me.  I do recall somebody with a Lion
system observing a hard lockup.  The workaround was to disable running
hwclock on boot.  Nobody here had time to poke around what was going on,
though.

Uros

--
Uros Prestor
uros@turbolinux.com