Followup-For: Bug #444028
Hello the critical trip points in kernel are there because they exist in some ACPI table. So the critical temperature should not be arbitrary but read from the hardware (although I am not sure if this is the case on ppc machines). There might be a possiblity to change the temperature with a parameter to the thermal module. Failing that you can patch the kernel. The other problem with critical zones is that on some hardware the kernel would occasianally read ridiculously high temperature. At least this is what I think because the machine would run for days and then suddenly shutdown while idle. I have patched my kernel so that it logs the temperature every few seconds but I have not been able to reproduce a trip with such kernel so far. The shutdown script is not hardcoded in the kernel, you can set it with sysctl just like modprobe. The other thing that fails is actually lowering the temperature before it reaches the trip point, and this is acpid's job. There should be a policy for more cooling that runs more fans than the bare minimum dictated by the acpi tables. On a notebook I tested there were three fan objects (which probably represent different speeds of the same fan), and only the lowest was ever started automatically. These were connected to an actively cooled zone (as opposed to critical zone) but running the higher fans cooled down the critical zone considerably. Another thing acpid might do is slowing down the CPU. On ppc macs this is perfectly normal way of avoiding overheating on OS X. That's probably one of the reasons they are so slow. Unfortunately, slowing down the GPU is usually not so easy. Thanks Michal -- System Information: Debian Release: 5.0 APT prefers stable APT policy: (1001, 'stable'), (500, 'unstable'), (1, 'experimental') Architecture: amd64 (x86_64) Kernel: Linux 2.6.28.3 (SMP w/1 CPU core; PREEMPT) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/bash Versions of packages acpid depends on: ii libc6 2.7-18 GNU C Library: Shared libraries ii lsb-base 3.2-20 Linux Standard Base 3.2 init scrip ii module-init-tools 3.4-1 tools for managing Linux kernel mo acpid recommends no packages. acpid suggests no packages. -- debconf-show failed -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
