Date:	Thu, 26 Aug 2010 22:38:38 -0300
From:	Cesar Eduardo Barros <cesarb@...arb.net>
To:	Joe Perches <joe@...ches.com>
CC:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Matthew Garrett <mjg@...hat.com>,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] intel_ips: quieten "power or thermal limit exceeded"
 messages

Em 26-08-2010 21:41, Joe Perches escreveu:
> On Thu, 2010-08-26 at 21:11 -0300, Cesar Eduardo Barros wrote:
>> Em 26-08-2010 20:33, Joe Perches escreveu:
>>> On Thu, 26 Aug 2010, Cesar Eduardo Barros wrote:
>>>> On my Dell Inspiron N4010, one of these messages is printed every five
>>>> seconds. Change both to dev_dbg to quieten them even more.
>>> I think you should instead fix your hardware or maybe change
>>> your thermal throttling settings.
>
> I was probably a bit hasty in writing that.
>
>> Is there a way to know if all this is just an oddness of this model, or
>> if there is something which is not working quite right?
>>
>> (All the output above is from 2.6.35.3; I am not running 2.3.36-rc2+
>> right now because it hangs on resume, and I have not yet had the time to
>> look at it.)
>
> Perhaps you might try this patch and get a bit more information.

Running with it right now. Unless I missed one, the messages do happen 
exactly every five seconds. Here are the first few lines of the dmesg 
(grepping for 'intel ips'), and it does seem a bit strange:

$ dmesg | fgrep intel\ ips
intel ips 0000:00:1f.6: Warning: CPU TDP doesn't match expected value 
(found 25, expected 35)
intel ips 0000:00:1f.6: PCI INT C -> GSI 18 (level, low) -> IRQ 18
intel ips 0000:00:1f.6: IPS driver initialized, MCP temp limit 65535
intel ips 0000:00:1f.6: MCP power limit 65535 exceeded: 25615533
intel ips 0000:00:1f.6: CPU power limit 8183 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 6276 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 7952 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 7155 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 5928 exceeded: 0
intel ips 0000:00:1f.6: MCP power limit 65535 exceeded: 70848
intel ips 0000:00:1f.6: CPU power limit 6430 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 6474 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 5508 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 6569 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 5250 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 5023 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 6209 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 7276 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 9027 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 7008 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 5478 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 6658 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 5192 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 6347 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 5506 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 4447 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 4462 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 4382 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 4862 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 5218 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 4865 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 4131 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 5331 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 6012 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 5323 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 4727 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 4949 exceeded: 0
intel ips 0000:00:1f.6: MCP power limit 65535 exceeded: 69539
intel ips 0000:00:1f.6: CPU power limit 5045 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 5070 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 5113 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 4262 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 5158 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 4865 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 4302 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 4430 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 4841 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 4532 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 4814 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 4803 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 5139 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 4050 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 6176 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 4746 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 3739 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 4863 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 4917 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 4099 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 4956 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 5018 exceeded: 0
intel ips 0000:00:1f.6: CPU power limit 3863 exceeded: 0

I think you put the parameters in the wrong order on the dev_info() call 
for the CPU power limit; it is the limit that is 0.

Two bogus things I can see:

- The first "MCP power limit exceeded" seems very bogus.
- What do you mean, core_power_limit is zero?

I will go back to 2.6.35; not feeling like debugging my (unrelated) 
suspend/resume problem right now. If you have another debugging patch, I 
will probably test it only tomorrow night.

-- 
Cesar Eduardo Barros
cesarb@...arb.net
cesar.barros@...il.com
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