Talk:How to control fan speed
Z61m is the same like Z60.
The kernel 2.6.18 ibm_acpi 1.12a does not allow speed command. but with direct ecdump it works. the displayed fan speed changes. (But i dont notice any noise difference)
On Z61m and Kenrel and unpatched ibm_acpi from 2.6.18: on Start the Fan is disabled :( speed 0. with echo enable > fan the fan goes to maximum rpm of 2400. (Temperatur goes above 78Â°C .. Bad)
On Full CPU Duty: Mode RPM 0 0 (fast switch) 1 2257 (slow switch, 5-10s) 2 2257 3 2664 (fast switch) 4 2699-2719 5 2800 6 3400 7 3284 (100%load cpu temp 68Â°C) 8-F same as 7 0x8F 2600 !! 0xFF speed is not chaning anymore ? (not measurement ?) 0xCF 4200 (very slow chaning.. 30s for spin up)
(perhaps this table helps a little bit.)