Ubuntu: Dell xps 15z fan issue in ubuntu 12.04


I just updated to ubuntu 12.04 on my Dell laptop xps 15z.

The trouble is that I hear a slight ticking sound every 3rd second, probably from a fan. This is a new issue in this ubuntu version.

I use the recommended boot options for grub, i.e. acpi_backlight=vendor, but I do not use any acpi=off or acpi=noirq.

Is there a way to fix this issue from ubuntu, by maybe controlling the fans somehow?

EDIT: Notice, the sound goes away as the fan speeds up, (when doing calculations or such), so it is really a fan issue.

EDIT2: I have located the issue: If I use conky 1.9, together with the command execpi for a python application, then the sound appears, and the noise syncs with the update interval for conky (NOT for the update interval for execpi!). The noise seems to be proportional to the complexity of the drawing that is needed. This is very strange, as this issue was not in the prev. version of conky I used.

The solution was to increase the update interval for conky from 0.5 to 3, i.e. update every 3rd second instead of twice a second.


I have the exact same laptop, and when I tried messing around with acpi=off and the likes, it did cause the fans and power management to bork.

I simply added noapic to the end of the startup line instead, and everything has been working like a dream for the last 9+ months.

One is ACPI (Advanced Configuration and Power Interface) and the other APIC (Advanced Programmable Interrupt Controllers).


That seems more like something in case than an OS problem, but I presume you've checked that.

They seem to explain fan control here,

Hope this helps.

Disclaimer: I don't think this will fix the situation and all changes should be done at your own risk.

Note:If u also have question or solution just comment us below or mail us on toontricks1994@gmail.com
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