From mboxrd@z Thu Jan 1 00:00:00 1970 From: Uros Prestor Date: Sat, 09 Sep 2000 19:51:03 +0000 Subject: Re: [Linux-ia64] possible bug in the efi real time clock Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org 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