echo 75000 > /sys/class/thermal/thermal_zone0/trip_point_1_temp - Permission denied!!

[John Hupp]

On 6/5/2014 10:39 AM, John Hupp wrote:
> Trying to edit an acpi thermal trip point, I show from 
> /sys/class/thermal/thermal_zone0:
>
> $ echo 75000 > trip_point_1_temp
> bash: trip_point_1_temp: Permission denied
>
> I get the same result using sudo.
>
> I also tried with the same result:
>
> $ echo 75000 | sudo tee trip_point_1_temp
> and
> $ sudo sh -c "echo 75000 > trip_point_1_temp"
>
> I also tried "echo -n" instead of just "echo" with the same result.
>
> I also tried echo "75000" instead of just echo 75000.
>
> I also tried the above commands from 
> /sys/devices/virtual/thermal/thermal_zone0 (where the links from 
> /sys/class/thermal point), all with the same result.
>
> These thermal attributes are supposed to be editable by the user, and 
> this is confirmed by 
> https://www.kernel.org/doc/Documentation/thermal/x86_pkg_temperature_thermal
>
> I have read that there was one or more bugs in the past that behaved 
> this way.  Do we have a new bug?
>
>

(This is under Lubuntu 14.04 32-bit desktop version, with kernel 
3.13.0-27.50-generic.)