linux-kernel - Re: PROBLEM: Dell Inspiron 1501 fails to boot in 2.6.21+

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Message-ID: <20070721115948.GA29178@elte.hu>
Date:	Sat, 21 Jul 2007 13:59:48 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Mark Tiefenbruck <mark@...xbox.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: Dell Inspiron 1501 fails to boot in 2.6.21+


* Mark Tiefenbruck <mark@...xbox.org> wrote:

>  IO window: disabled.
>  MEM window: c0200000-c02fffff
>  PREFETCH window: disabled.
> PCI: Bridge: 0000:00:14.4
>  IO window: disabled.
>  MEM window: c0300000-c03fffff
>  PREFETCH window: disabled.
> PCI: Setting latency timer of device 0000:00:05.0 to 64
> PCI: Setting latency timer of device 0000:00:06.0 to 64
> NET: Registered protocol family 2
> 
> The next few lines are usually as follows, but recent kernels never 
> get to them:

thanks for the detailed report and bisection test! The above hang 
strongly implicates some sort of high-res timers, dynticks or 
clocksource problem. Most likely timer interrupts do not come as 
expected, and the above place is one of the first spots where the kernel 
waits for a (short) timeout - so you see it hang indefinitely.

Besides the options Thomas suggested, you could also try 
clocksource=pm_timer?

	Ingo
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