From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753543Ab2DYEpG (ORCPT ); Wed, 25 Apr 2012 00:45:06 -0400 Received: from cantor2.suse.de ([195.135.220.15]:51923 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752104Ab2DYEpF (ORCPT ); Wed, 25 Apr 2012 00:45:05 -0400 Date: Wed, 25 Apr 2012 14:44:52 +1000 From: NeilBrown To: Chris Jones Cc: Linux Kernel Mailing List Subject: Re: 3.1+ kernels unbootable Message-ID: <20120425144452.32a803fe@notabene.brown> In-Reply-To: <20120425142001.2cb7a79e@ubuntu> References: <20120425124925.267056b5@ubuntu> <20120425132122.11280b66@notabene.brown> <20120425142001.2cb7a79e@ubuntu> X-Mailer: Claws Mail 3.7.10 (GTK+ 2.24.7; x86_64-suse-linux-gnu) Mime-Version: 1.0 Content-Type: multipart/signed; micalg=PGP-SHA1; boundary="Sig_/7DdHmrBeqwfRet8DrehrPvu"; protocol="application/pgp-signature" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --Sig_/7DdHmrBeqwfRet8DrehrPvu Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Wed, 25 Apr 2012 14:20:01 +1000 Chris Jones wro= te: > On Wed, 25 Apr 2012 13:21:22 +1000 > NeilBrown wrote: >=20 > > You might like to try=20 > > a/ describing your current system in more detail. > > b/ describe what actually happens when you try to boot a 3.1+ kernel. > > It is rare that absolutely nothing happens. > > Also describe the provenance of these 3.1+ kernels (do you compile > > yourself, or get them from a distro or....) > >=20 > > NeilBrown >=20 >=20 > Thanks Neil. I use standard x86_64 Intel CPU system with 2.0GB DDRII > RAM on a Gigabyte GA-8VM800PMD-775-RH motherboard. >=20 > This happens on both Ubuntu and Fedora kernels. And in fact, any kernel > 3.1 or above. It's not only very odd, but also very annoying. >=20 > I get to the boot screen and when I select ENTER to boot into the > system, my screen goes black and then the system reboots. It's > definitely a kernel issue as anything (as mentioned already) with > kernel 3.0 or below works just fine. >=20 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=3Doff" to the boot args. Linux has a thing called 'early_printk' which allows messages to be display= ed 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. May= be 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 aweso= me. NeilBrown --Sig_/7DdHmrBeqwfRet8DrehrPvu Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) iQIVAwUBT5eBRDnsnt1WYoG5AQJzKhAAt7pLYbaHuzS90vGYL87c7Tpt+AeU8pUA vEYCy7V3ywbsy0EBLUnrhdLOcywPNp9/6lUlTMGRT1pJ0YpWzu7Fp/NH4Wdk0Jec QuO9xfuPuOo/OKo1eBxfJY+T7Wq9yDLQdECYr/YV2Cf5dpFNOSZFglD/VffVsU1I rTx/mX3j3R2XfNCmnB2PBgaEFw4+PBrFsE41/YHIgpXcLACDursUaGt9jlNq6xX1 XSQz9mSlVfxG8gic/7Q7Eq2z3+OaGVCKiq3y9FNy/V9QzbksDxIdRHJHgjJLUjPC JKgEA1njxmXOQvy8uUjkCKbuYqDaaTwOCMNZWntyGgH9Yi3jwo7mzXXL1FQzxjuC taclXYcZotzJvNNyeGDc2X7dBBhL7bCAXKBVsVV/IO8KjlvRazt/Am4tCnHNICab hT0mcuo8J4kbZ3z/NUehjkoz5t2zVkt9pPaKV9hOW4A0qwQOeKyRnrpFWaT/fZkD b5WVcKiZ76C7+S/YgMh+9IT7Hqv6hYRwkIFSmjIJUKXdwPihWI1nUYgs6CIzfh86 02jOlg2nc+bQ0oFx5TQfjgXVRhWqjyj9Kgp6Z24ss3VL0LXh3KierBBGmh5kwI+W J0M25H7AElWD9TqNpmv31crsC4fwD8hvJ+mVG0zsWQVBBiPE093PVMOxm/F9hzTw 9GK5gUTCpW0= =3cc8 -----END PGP SIGNATURE----- --Sig_/7DdHmrBeqwfRet8DrehrPvu--