fan stops spinning after booting into linux
I have got an Acer 3820T laptop. Among many problems that it seems to have with linux, the most critical one is that when I boot into linux, the fan stops spinning. I have already verified that the relevant modules are loaded into the kernel,
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~$ modprobe --first-time -a processor thermal fan acpi-cpufreq coretemp Running sensors-detect I would get Code:
Sorry, no sensors were detected. Code:
$ uname -a |
update:
Although when I want to insert modules processor, thermal, fan into the kernel it gives the warning that the module is already in the kernel (builtin), when I run the commands Code:
$ lsmod | grep processor I am confused in here, how can this happen that I get two contradicting outputs! |
if the machine isn't suffering from overheating issues then I wouldn't worry too much, perhaps the fan is merely shut down to save power on the battery. I've seen that on some laptops, the fan will only run when the laptop is hot enough to need the fan to cool it, otherwise it stays off. Either way have you tried looking at energy saving settings in either bios or Linux?
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I had to compile a custom kernel for my Toshiba 7000CT PentiumII for the fans to work with fnfx on ARCH linux
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My laptop also stops the fan, if the temperature of the CPU is below a certain value (for me it is 50° C). Have a look at your temperatures, maybe there is nothing wrong. |
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according to acpi -ti : Code:
Thermal 0: trip point 0 switches to mode critical at temperature 96.0 degrees C Can it have any thing to do with acpi trip points? Does this configuration of trip points seem correct to you? |
At first, I find the value of 85° for enabling the fan a bit high, and I think that only a gap of 3° to switch to critical mode is a very small gap. On my laptop I have much more trip points, almost every 10°.
May be that your ACPI-tables in BIOS are incorrect, I have already heard somewhere that this may be the case, but only for Linux, they work on Windows. Sadly, I think I am stuck here and can't help anymore. |
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