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I have a Lenovo 3000 C200
laptop running Lubuntu 14.04 with kernel 3.13.0-27.50-generic.
The BIOS setup has no thermal management settings. And it only
has 2 ACPI trip points defined: Critical @ 102 deg C, and Passive
@ 87 deg C.
That strikes me as a lousy setup, and I have been trying to edit/add trip points. Trying to edit an acpi thermal trip point 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. I get the same results going back to Lubuntu 12.04, and also with Kubuntu and Ubuntu. These thermal attributes are supposed to be editable by the user, according to http://www.kernel.org/doc/Documentation/thermal/x86_pkg_temperature_thermal But today I found this 2007 article that says the kernel no longer supports changing the trip points: http://lwn.net/Articles/244595/ Is there a prescribed way to edit/create/save these thermal attributes, or am I doomed to burn? |
