To THINKPAD ACPI EXTRAS DRIVER authors and related mailer list, (got this list from MAINTAINERS and thinkpad_acpi.c)
This problem occasionally happens on my Thinkpad T410 with some recent kernels, I remember this problem since 2.6.35 when I was installing Ubuntu-10 and now I have switched to Arch Linux with self complied latest 3.4-rc5, this issue is remaining there, most of time the fan is working well, but usually every night I close the laptop let the Linux suspend; then resume on next morning, occasionally the laptop could become very hot, usually above 90℃ for long time, if I compile something or do some heavy work, it may go up over 128℃ then machine automatically shutdown, # cat /sys/devices/platform/thinkpad_hwmon/temp1_input 97000 # cat /sys/devices/platform/thinkpad_hwmon/fan1_input 65535 I guess the fan is actually not working at all; I tried unload & reload the kernel module but it still doesn't work; I tried manually set a speed level but it's still 65535, the machine is still hot # modprobe -r thinkpad_acpi && modprobe thinkpad_acpi fan_control=1 # echo 'level full-speed' >/proc/acpi/ibm/fan # cat /proc/acpi/ibm/fan status: enabled speed: 65535 level: disengaged commands: level <level> (<level> is 0-7, auto, disengaged, full-speed) commands: enable, disable commands: watchdog <timeout> (<timeout> is 0 (off), 1-120 (seconds)) It seems the only way is to complete power off Linux for a few seconds, power on again then the fan could be working, I observed a normal speed should be between 3000 ~ 5000, and machine temperature is 40~70℃, normally working; Wonder if someone experienced same problem and how can we fix it? at least to know how can I recover the fan to work, without rebooting Thanks, -- To unsubscribe from this list: send the line "unsubscribe platform-driver-x86" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
