As always destiny seems to challenge our will to reach the peak!

> Another option to reduce the whistle is to run "powertop --auto-tune"
> after boot.  Here's a service definition I put into my OS config to
> do this:
> 
> --8<---------------cut here---------------start------------->8---
> (define (powertop-auto-tune-service)
>   (let ((powertop #~(string-append #$powertop "/sbin/powertop")))
>     (with-monad %store-monad
>       (return
>        (service
>         (documentation "Run powertop --auto-tune.")
>         (provision '(powertop-auto-tune))
>         (requirement '(user-processes))
>         (start #~(lambda _
>                    (zero? (system* #$powertop "--auto-tune")))))))))
> --8<---------------cut here---------------end--------------->8---
> 
> And then include (powertop-auto-tune-service) in the 'services' field.
> Note, you'll need to import some extra modules at the top of the file:
> 
> --8<---------------cut here---------------start------------->8---
> (use-modules (gnu)
>              (gnu services)
>              (guix gexp)
>              (guix store)
>              (guix monads))
> --8<---------------cut here---------------end--------------->8---
> 
> [...]
> 
> My workaround was to add another service that disables the
> second CPU core when it gets too hot.  Here's the service definition I
> used:
> 
> --8<---------------cut here---------------start------------->8---
> (define (temperature-regulation-service)
>   (with-monad %store-monad
>     (return
>      (service
>       (documentation "Regulate temperature on an overclocked Libreboot 
> X60.")
>       (provision '(temperature-regulation))
>       (requirement '(user-processes))
>       (start #~(lambda _
>                  (let ((pid (primitive-fork)))
>                    (if (positive? pid)
>                        pid
>                        (let ()
>                          (define (current-temp)
>                            (call-with-input-file
>                                "/sys/class/thermal/thermal_zone0/temp"
>                              read))
>                          (define (set-cpu1-online! online?)
>                            (call-with-output-file
>                                "/sys/devices/system/cpu/cpu1/online"
>                              (lambda (port)
>                                (write (if online? 1 0) port))))
>                          (let loop ()
>                            (let ((temp (current-temp)))
>                              (cond ((< temp 88000) (set-cpu1-online! 
> #t))
>                                    ((> temp 92000) (set-cpu1-online! 
> #f))))
>                            (sleep 2)
>                            (loop)))))))
>       (stop #~(make-kill-destructor))
>       (respawn? #t)))))
> --8<---------------cut here---------------end--------------->8---
> 
> and as above, you'll need to add (temperature-regulation-service) to 
> the
> services field, and of course run "guix system reconfigure <OS-CONFIG>"
> and reboot.
> 

Should i add (define (temperature-regulation-service)...
and (define (powertop-auto-tune-service)...
inside (operating-system) definition ?

Actually "sudo guix system reconfigure /etc/config_20151024_B.scm"
returns "/etc/config_20151024_B.scm:10:0: error: source expression 
failed to match any pattern".
I've attached my config file for details". Where am i mistaking ?

Note: as you can see i defined locale de_DE.utf8: if i redefine it to 
en_GB.utf8, does 'system reconfigure' will update my locales ?

I'm actually planning to properly learn Scheme to correct this things 
autonomosly"
Thanks for reading!