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After much trials and tribulations :-), I was able to get some ACPI functionality on my notebook - Sager NP5620 running Slack 10 kernels 2.4.26 and 2.6.7. Supend and Standy don't appear to work but this is not a real issue because the system is used mostly as a desktop replacement. What is really annoying, is the fan noise. The fans never seem to stop when the notebook is running on electricity from the wall outlets - even when the cpu load is 0% and during prolonged periods of inactivity. When powered by the battery though the fans do go on and off in accordance with system temperature.
I have read that the fans can be controlled with ACPI using the entries in the /proc/acpi/fan directory. The problem is that on my system, this directory is totally empty. Has any one who has had a similar experience been able to have those files created in that directory afterwards thus facilitating some fan control? I would truly like to get a solution.
Just guessing here, but are the ACPI functions in your bios enabled?
I have an old Gateway laptop and I keep these functions DISABLED in the
bios. I have used both APM and ACPI with good fan control.
Just in case it matters, these are the ACPI functions I have enabled: