[SOLVED] Fan stop at kernel load

[electrovalent]

Fujitsu Siemens Amilo L1310G Notebook running Kubuntu 9.04 with 2.6.28-11 and 2.6.28-15 kernels installed.
Hi.The problem exists only when i boot with the processor cold,the fan stop at kernel load.When reboot with the processor temperature over the 60C the fan works but only until goes back to 60C and stops again.I am new to linux and i have no idea of programming or compiling the acpi.Sorry for my english.

[D-cat]

Several chips, including many found in notebooks, report the incorrect temperature to the OS. When Windows drivers are written, this is taken into account so the fans still run normally, but Linux is unaware and will let your processor cook. Note that this is a (relatively common) design flaw and not a fault of Linux. I suspect the design flaw is deliberate to lock the user into a Windows environment, but that's only a suspicion.

Try adding acpi=off to your kernel boot options. This leaves many power save features (including fan operation) in BIOS control instead of taking it over.

sudo nano /boot/grub/menu.lst

find the default (usually first) kernel line towards the bottom of the file. Make your edit. [Ctrl + o] to save, [Ctrl + x] to exit. reboot

## ## End Default Options ##

title		Ubuntu 8.10, kernel 2.6.27-14-generic
uuid		(your-boot-partition-uuid)
kernel		/boot/vmlinuz-2.6.27-14-generic root=UUID=(uuid) ro quiet vga=773 acpi=off
initrd		/boot/initrd.img-2.6.27-14-generic
#quiet

[electrovalent]

The acpi=off option gives me a blank screen after the grub menu.

[D-cat]

That's not right. You didn't happen to accidentally break the line did you?

Try booting the previous kernel (or the CD live if need be), then instead of using nano, use gedit.

You can also remove the "quiet" and "splash" options in the kernel line. This will boot showing the classic text interface so you can watch as it's booting and see where things stop or go wrong.

[electrovalent]

i boot from another kernel,remove the acpi=off and ok.what do you mean "break the line"?Also i change this option by running kate with gksu.Is that changing the result?The thing is that i cant get a fix for that almost two months now.Can you help me apply the patches from that link? bugzilla.kernel.org/show_bug.cgi?id=11000

[electrovalent]

Well,the classic text booting didn't show anything wrong.

[D-cat]

No, kate is just fine (I didn't know you were running KDE). Breaking the line is what happens in pico/nano sometimes when the word wrap function takes effect and saves the wrapped text as a new line. That confuses parsers as they expect all kernel options to be on one line. If you use gedit or kate, you shouldn't have to worry about that.

Recompiling a patched kernel for a laptop I don't have access to is a little beyond my comfort zone. If that's the route you want to take, maybe someone else can jump in here. I know you're going to need the kernel sources and the compile tools (install build-essential).

Have you tried adding the acpi=off back in the kernel line while the splash and quiet are not present in order to see if you can identify where the whole thing goes blank? You can do this from grub for a single boot (not saved)...

Highlight the menu item, press e to edit. Highlight the kernel line, press e to edit. Make the desired changes you want to test. Press Enter to exit the editor while keeping the changes. Press b to boot.

[electrovalent]

I already tried that,to see what is going wrong but everything seem to be ok .After the loading files a blank screen with a flashing line on top came up.As for the compile tools i dont think i 'm able to do such things yet.I fell in the deep to early.I realized that installing other linux distro will not give me different results(already test debian,kubuntu,fedora)I want to ask you about freeBSD.Its using the same kernel?Or any other ideas?

[D-cat]

While FreeBSD was written with some of the same idealic origins of Linux, it is not the same code (this is a good thing as far as this problem is concerned). I haven't used it, but it might be worth a try for you. At worst it'll be no different, at best it'll do exactly what you need. Good luck!

[electrovalent]

I think its my last choice.Thanks!