[ltp] Re: Tracking down a EC firmware bug (fan reading)

[Henrique de Moraes Holschuh]

On Wed, 04 Oct 2006, Marco Gaiarin wrote:
> HdMH>         Make sure you don't have any fan control scripts or anything else
> HdMH>         that might be writing to the fan control register!   This is *very*
> 
> How i can be sure of this? I'm using a plain ubuntu 6.06, and i've not load
> the laptop-mode package.

Well, 'rgrep "/proc/acpi/ibm" /etc /usr/bin /usr/sbin'   should do it.

> report nothing. Suffices?

It helps, but I am not that well versed on Ubuntu to know for sure whether
or not they have ThinkPad fan control in their system or in a certain
package.  Debian doesn't.

> HdMH>         If you *know* for sure that your ThinkPad powers up in automatic
> HdMH>         fan control (i.e. it varies by itself the fan speed when it gets
> HdMH>         hotter, etc) -- AFAIK all ThinkPads do this, but... -- then you
> HdMH>         don't need to sleep to RAM.
> 
> I'm pretty sure, but i've hear my T23 do some more noise in very rare case,
> as for kernel compilation (but 'm using the ubuntu kernel).

Ok.

> gaio@aurora:~$ cat /proc/acpi/ibm/fan
> status:         enabled
> speed:          0
> commands:       enable, disable

That would mean no bug, *if* we are certain that nothing wrote to the fan
control register.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh