[NTLUG:Discuss] Temperature Triggers

[Stephen Davidson]

Greetings.

This is an older bios -- there are NO temperature settings, readings, or
other temperature controls in the BIOS.

Lm_sensors had some kind of "upgrade" at some point and now if a CPU
temp (and/or GPU, depending on system capabilities) exceeds thresholds,
it issues an "shutdown -h now" command to the OS.  For a 'modern' CPU,
the thresholds are actually a bit on the high side.  For this particular
line of CPUs, that threshold is low (for the parent or previous
generation CPU, VERY low -- the threshold is just above it's normal IDLE
temp of 85C!).

There are a couple of processes that will run and load the CPU (one of
which is the 'Up-to-date check'), and if they run long enough (or back
to back), CPU will start approaching normal max temp (if memory serves,
that's 99c on this system -- but it's been a while & HP's docs says
95c).  Air flow is good, and I've just disassembled and cleaned the
system so all dust bunnies are removed -- and I did double check that
the fans are running properly.

Contents of 'sensors.d/laptop' file (note: when temp1_input ==
temp1_crit, 'shutdown -h now' gets issued by a daemon for lm_sensors);

chip "acpitz-virtual-0"
   compute temp1 @+10, at +10

Output:
steve at sda64 ~ $ sensors -u
acpitz-virtual-0 Adapter:
Virtual device temp1:
    temp1_input: 60.000
    temp1_crit: 100.000

k8temp-pci-00c3
Adapter: PCI adapter
Core0 Temp:
    temp1_input: 44.000

Without the sensors.d file;
steve at sda64 ~ $ sensors -u
acpitz-virtual-0 Adapter:
Virtual device temp1:
    temp1_input: 50.000
    temp1_crit: 90.000

k8temp-pci-00c3
Adapter: PCI adapter
Core0 Temp:
    temp1_input: 44.000

I need to be able to raise the temp1_crit to at least 95 (preferably 97)
w/o also raising the temp1_input value.  Unfortunately, I found in my
experiments that only the first @+10 is getting used in that compute
line.  So, what did I miss in the documents for lm_sensors on this, or
who do I need to contact to get this looked into?

Regards,
Steve

On 08/27/2015 04:38 PM, Gilbert Morrow wrote:
> BIOS controls the CPU temperature threshold, OS uses it to determine
> readings.
> I use to overclock a lot in the past, I used water cooling for the old game
> boxes. I still have one for an old AMD processor, radiator, fan, and
> heatsink water block.
> On Aug 27, 2015 3:09 PM, "Stephen Davidson" <gorky at freenet.carleton.ca>
> wrote:
>
>> Greetings.
>>
>> I have an oldstyle AMD CPU, one of the first generations after the
>> legendary "Cook an egg on it". (I tried Googling for one of the videos
>> from that era, but no luck in the first couple of pages, sorry).
>>
>> Normal max operating temp is 95c, but the system does a protective
>> shutdown at 90c.  I've tried modifying this in lm_sensors
>> /etc/sensors.d, but so far no luck.  The current documentation seems to
>> be not current with the current code.  I have an entry:
>>
>> compute temp1 @+10, at +10
>>
>> but it seems that:
>>  - only the first @+10 is read and is used both for setting critical and
>> adjusting display
>>  - temp1 is now displaying 10c higher than other sensors.
>>
>> NOTE: There is generally a 5c temp difference between 'Core0' and Temp1,
>> Temp1 being higher.
>>
>> Any suggestions?
>>
>> Regards,
>> Steve
>>
>>
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