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


>-----Original Message-----
>From: linux-kernel-owner@vger.kernel.org
>[mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of Milan Plzik
>Sent: Wednesday, August 13, 2008 7:16 AM
>To: linux-kernel@vger.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

It may not be a problem with cpuidle code per se. We have had issues earlier like this one

http://bugzilla.kernel.org/show_bug.cgi?id=10011

Cpuidle tries to go to C3 state aggressively and thus may be indirectly causing the problem with graphics hardware or something like that.

From Dave's comment in the above bugzilla:
can you try with Option "DRI" "Off" in your xorg.conf

Does that change anything?

Thanks,
Venki


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