UBS Hardy 8.04 RT kernel panic...

wayne wayne at
Tue Jun 30 19:22:32 BST 2009

On Tue, 2009-06-30 at 17:54 +0000, beejunk at wrote:

> On Jun 30, 2009 10:29am, wayne <wayne at> wrote:
> > ahoy all,
> >     i have been looking into this bug every once in a while (for
> around 1 year) and have yet to solve it.  yes, i am still running
> Hardy UBS 8.04, as it is reliable and does the job.  i am thinking
> that many of you are in the same boat.
> > 
> >     i am running 2.6.24-24-rt #1 SMP PREEMPT RT with all the latest
> Hardy updates/etc. applied on a 1st Generation MacBook Core Duo.  the
> problem is the following kernel panic that happens at least 50% of the
> time on a restart (either cold boot or hibernate, which basically work
> the same on the MacBook, in that the boot loader/refit is executed):
> > 
> > MP-BIOS bug: 8254 timer not connected to IO-APIC
> > 
> > Kernel panic - not syncing: IO-APIC + timer does not work! Boot with
> apic=debug and send a report. Then try booting with the "noapic"
> option
> > 
> > if no kernel panic occurs, usually the MP-BIOS bug line still
> appears.
> > 
> >     i have found a few bug reports and comments on-line, but no
> solutions have worked for me.  it is not the worst bug in the world,
> but often i boot up from hibernate and then setup instruments/etc.
> waiting for the long thaw from hibernate.  then i return to my
> computer and see the kernel panic.  perhaps someone else has some
> clues/insights, and we can get the fix in the list archives for
> others, as it seems Hardy UBS is still the preferred production
> platform.
> > 
> >     perhaps the solution is to simply upgrade to 9.04, though seems
> like there are still some RT issues working themselves out.  any
> experience with UBS 9.04 on a MacBook?
> > 
> > peace, w
> > 
> I can confirm the exact same behavior, on the exact same set-up.
> Sadly, I've not been able to find any solutions for it, either.

    thanks for the reply.  hopefully someone has an answer....

> I can say that the problem does not exist on Jaunty with a first
> generation MacBook, which is good. However, the performance of the RT
> kernel in Jaunty on my set-up was poor, and so I went back to good ol'
> dependable Hardy. Besides an unusable amount of X-Runs, the RT kernel
> also constantly had my fans running, which was very annoying, and in a
> mixing environment also obstructive. At this point I have the feeling
> that I'll be waiting until Karmic to try again.

    that is what i heard and why i am avoiding the upgrade for now.

> As for the issues with suspend and hibernation, I've just gotten into
> the habit of never doing those things. I turn the computer on when I
> need to record, I just leave it running with a blank screen (with the
> lid up, of course) during down times, and then shut it down when I'm
> done. It's a bit inconvenient, but the rest of the performance in
> Hardy is so solid that I've just accepted the minor hassles.

    i had problems with suspend/hibernate initially, but the problem was
my swap space not being activated (UUID problems in /etc/fstab).  other
than hibernate taking about 2 minutes to shut down, and 4 minutes to
thaw, hibernate 99% works fine, suspend as well.

thanks, w

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