[ltp] Re: ThinkPad T61 (7658CTO) Thermal Sensors

[Micha]

On Tue, 22 Jul 2008 15:52:39 +0100
Daniel Castro <castromd@tcd.ie> wrote:

> Not safe you say... uhm...
> Well even with the fan constantly running the cpu temp will be around 
> 65C on normal CPU usage.
> I haven't found anywhere where it actually says what's safe and what's 
> not. Not even on those websites you quote. But anything below 75C for 
> the cpu sounds safe to me. Is it not really?
> 
> ________________________

not sure about the state of affairs with current cpus but a previous one was amd
athlon xp which had faulty cooling on that laptop. It would shut the computer
down at 80c and after it was doing that for a couple of months (pushed it to
much due to warranty issues) it burned it's self out.

My previous core 2 t7500 (just replaced so no stats on the current one) would
go up to around 69/70 under stress and then it would start throttling itself.

> 
> Daniel Castro
> Networking and Distributed Systems
> Computer Science
> Trinity College Dublin
> 
> Mobile: 083-318-2058
> 86.4.3 Trinity Hall, Dartry Road, Dublin 6
> ________________________
> 
> 
> 
> green wrote:
> > On Tue, 2008.07.22, 204, Daniel Castro wrote:
> >   
> >>    So to elaborate more in this:
> >>    I think I have identified some of the sensors:
> >>
> >>    dancasmo@BlackBeauty:~$ cat /proc/acpi/ibm/thermal
> >>    temperatures:    59 50 42 -128 50 -128 25 -128 49 54 50 -128 -128 -128
> >>    -128 -128
> >>
> >>    +------------------------------------------------+
> >>    |  Index in "thermal"   |Location (estimated)    |
> >>    |-----------------------+------------------------|
> >>    |           1           |CPU                     |
> >>    |-----------------------+------------------------|
> >>    |           2           |MiniPCI                 |
> >>    |-----------------------+------------------------|
> >>    |           3           |HDD                     |
> >>    |-----------------------+------------------------|
> >>    |           4           |n/a (-128)              |
> >>    |-----------------------+------------------------|
> >>    |           5           |Battery 1               |
> >>    |-----------------------+------------------------|
> >>    |           6           |n/a (-128)              |
> >>    |-----------------------+------------------------|
> >>    |           7           |Battery 2               |
> >>    |-----------------------+------------------------|
> >>    |           8           |n/a (-128)              |
> >>    |-----------------------+------------------------|
> >>    |           9           |?????                   |
> >>    |-----------------------+------------------------|
> >>    |          10           |?????                   |
> >>    |-----------------------+------------------------|
> >>    |          11           |?????                   |
> >>    |-----------------------+------------------------|
> >>    |          12           |n/a (-128)              |
> >>    |-----------------------+------------------------|
> >>    |          13           |n/a (-128)              |
> >>    |-----------------------+------------------------|
> >>    |          14           |n/a (-128)              |
> >>    |-----------------------+------------------------|
> >>    |          15           |n/a (-128)              |
> >>    |-----------------------+------------------------|
> >>    |          16           |n/a (-128)              |
> >>    +------------------------------------------------+
> >>
> >>    I still don't know what indexes 9, 10 and 11 are. Anyone knows? Or any
> >>    ideas how I can figure this out?
> >>    Also, those temperatures are with the fan off, I have it configured to
> >> be off when CPU temp is below 70C and 60C for the rest. Is that safe?
> >>     
> >
> > No!  That is likely not safe.  The CPU is, I think, the most 
> > temperature-tolerant area in the system.  Watch the other temperatures too.
> >
> > Although no one really knows what the safe thresholds are for the sensors.
> >
> > http://www.thinkwiki.org/wiki/How_to_control_fan_speed
> > http://www.thinkwiki.org/wiki/ACPI_fan_control_script
> >