linux-kernel - Re: 3.1+ kernels unbootable

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Message-ID: <20120429122106.044a1c88@ubuntu>
Date:	Sun, 29 Apr 2012 12:21:06 +1000
From:	Chris Jones <chrisjones@...n.net.au>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	NeilBrown <neilb@...e.de>, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: 3.1+ kernels unbootable

On Wed, 25 Apr 2012 14:44:52 +1000
NeilBrown <neilb@...e.de> wrote:

> 
> You have a couple of options here.
> 
> One is to use git-bisect to narrow down where the breakage is.  This
> means building about a dozen or a score of kernels and testing each
> one and then trying again.  If you are happy building your own
> kernels and have an afternoon to spare this is probably a good idea.
> There should be plenty of instruction on the web about how to do this
> but if you cannot find any feel free to ask.
> 
> The other is to try turning features off and debugging on.
> Many distros have some sort of "fail-safe" boot option which disables
> things like ACPI and known-problematic drivers... though with it
> failing so early most drives won't have even tried to run.  I'd guess
> an ACPI problem, but that is largely because I know almost nothing
> about ACPI so it is easy to blame it.  So try adding "acpi=off" to
> the boot args.
> 
> Linux has a thing called 'early_printk' which allows messages to be
> displayed even before the normal drivers are loaded.  I don't know
> much about enabling that on an x86 system (I use it a lot on ARM
> though).  You need it enabled when the kernel is compiled, and you
> need a boot arg to enable it too.  Maybe if you manage to enable
> that you might get some message printed.
> 
> Or maybe there is some other much more useful thing you can try and
> someone else will chime in soon and tell me I don't know what I'm
> talking about and explain in detail the right way so solve this
> problem - that would be awesome.
> 
> NeilBrown

I have tried all ACPI disabled options and also all safe-mode options,
among many other modes. Nothing has worked.

Now that Ubuntu 12.04 has gone gold, I might try the latest kernel in
that and see if anything has changed.

Thanks Neil.


Regards

Chris Jones
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