linux-kernel - Possible CPU_IDLE bug [WAS: Re: Timer unstability on when using C2 and deeper sleep states (Dell Latitude XT)]

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Date:	Wed, 13 Aug 2008 16:16:20 +0200
From:	Milan Plzik <milan.plzik@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Possible CPU_IDLE bug [WAS: Re: Timer unstability on when using C2
	and deeper sleep states (Dell Latitude XT)]

  Hello again,

On St, 2008-08-13 at 12:58 +0200, Milan Plzik wrote:
> I apologize for replying on my own mail (and also for top-posting, but
> this information is global update, not exactly fitting any of topics
> mentioned below).
> 
>   After playing for a longer while I found out that the system ends
> sometimes in state where, in order to do anything useful, I need to
> press keys on keyboard. Otherwise, the system just stalls and does
> nothing. I have no idea why does this happen (especially when I know
> that OHCI or wireless network adapter produce fair amount of
> interrupts). My /proc/interrupts is below. Just for the record,
> chipset
> on board is ATI RS600 with (apparently from lspci) ATI SB600
> southbridge.

  it looks like this problem disappears if CONFIG_CPU_IDLE option is
disabled, system seems to be stable for more than one hour. This
suggests that something may be wrong with the CPU_IDLE code. I can not
spend much more time by debugging the kernel, but if anyone has an
suggestion about what to fix, I will gladly test it. 

  Best regards,
	Milan Plzik

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