linux-kernel - Re: kernel stuck at trying to change CPU resolution.

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Date:	Sat, 18 Jul 2009 15:42:30 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Tj Hariharan <tj.physicist@...il.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: kernel stuck at trying to change CPU resolution.

On Fri, 17 Jul 2009, Andrew Morton wrote:
> On Fri, 26 Jun 2009 07:16:53 -0400
> Tj Hariharan <tj.physicist@...il.com> wrote:
> 
> > 
> > Hi, I have a Pentium-M 1.86GHZ processor Laptop. Standard DELL Latitude
> > D610. I ran the 2.6.31-rc1 kernel (updated tree as of 10 minutes ago).
> > The kernel gets stuck at the message saying "Switching to High
> > resolution mode on CPU0" after about 10 minutes it goes to the next
> > step, but then continues to get stuck. There is no log, as presumable
> > this is happening before the kernel fully initialises the harddrive and
> > passes control to user mode. I am running a non modular kernel with no
> > major changes made to my configuration since 2.6.27. I have never had
> > any issues thus far. Since I am using a laptop I am unable to access the
> > sysrq key (which in my case is not prnt screen, but Fn+PrintScreen, and
> > Fn key is not read by kernel at all, even after full boot and under
> > normal conditions). Thank you for your time. I have also attached my
> > config file. 

Tj, does the kernel boot when you add "nohz=off highres=off" to the
kernel command line ?

Another thing worth a try is to add "hpet=disable" to the kernel command
line. HPET code is the major change in the timers area since 2.6.27.

Thanks,

	tglx
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