Re: [lm-sensors] Will there ever be EMC6w201 support?

[Jeff Rickman <jrickman@myamigos.us>]

On 5/9/2011 2:42 PM, Jean Delvare wrote:
> Hi Jeff,
>
> On Sun, 08 May 2011 22:32:16 -0500, Jeff Rickman wrote:
>> What Harry's comments tell me is the original "i8k" code lacks
>> appropriate code to operate in a SMP environment. I think the Console
>> messages are trying to say that for "non-programmers" like myself.
>>
>> Note these differences:
>> - Harry has a single CPU; I have 2 CPU.
>
> This is a valuable observation. I presume that these CPUs are too old
> to be multicore, best they could have it hyperthreading. Harry, can you
> please share the contents of /proc/cpuinfo?
>
> Jeff, could you please try booting with parameter max_cpus=1? I wonder
> if it would make a difference. If it does, that would confirm your
> theory.
>
>> - We both run the same Dell BIOS A07 code.
>> - Harry's Linux kernel is slightly older than my 2.6.35.12-90 Fedora code.
>> - I think we would all agree that Jean's changes do not cause my crash
>> since that code works on Harry's machine but not on mine.
>>
>> Time permitting, I will start doing the research to submit a properly
>> documented bug against Fedora Core 14 regarding this code. I suspect
>> this issue will also reside in FC15 so that is another point to check if
>> time allows. jean raises the real question: does anyone in the Fedora
>> team want to fix this?
>
> I've seen this nug hit an openSUSE user (on a laptop with one
> multi-core CPU), so it's definitely not specific to Fedora. It may be
> related to the version of gcc used by the distribution though. If
> Fedora people aren't interested, we may open a bug on
> bugzilla.kernel.org instead.
>
>> In closing, I agree with Harry: it is very nice to have some hardware
>> monitoring in a Dell platform.
>
> I'm glad you like it :)
>

I checked for any packages that could manipulate the CPU frequency. I 
only found "cpuspeed". I removed the "cpuspeed" package and rebooted to 
ensure a known state. Attempting to install the "stock i8k" module 
causes a crash. Reboot to return to known state.

I changed the "maxcpus=4" in "grub.conf" to "maxcpus=1". Reboot.

Attempt to load "stock i8k" module. Crash. "/proc/cpuinfo" shows 1 CPU.

Return system to previous configuration with "cpuspeed" and reboot.

My only other choice would be to physically pull CPU2, leaving CPU1 in 
the system, but we know that config should work based on Harry's testing.


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