On Mon, 2014-09-29 at 11:57 +0200, Christophe Thil wrote:
> Package: src:linux
> Version: 3.16.3-2
> Severity: normal
>
> Dear Maintainer,
>
> with Kernel 3.16, intel_idle is enabled for the Intel Atom S1260 CPU
> (Centerton SoC). This leads to a +20°C temperature increase when the CPU
> is idle, exceeding the 100°C alarm threshold for passive cooled systems
> like the Supermicro X9SBAA-F.
>
> With 3.14, intel_idle was blacklisted for this CPU, which runs fine. If
> 3.16 is booted with intel_idle.max_cstate=0 processor.max_cstate=0,
> which disables the intel_idle, the CPU also stays cool.
[...]
It looks like the relevant change is:
commit acead1b0fac5b10d0ae3f1cc5f7820b9f9f924f5
Author: Jan Kiszka <jan.kiszka@siemens.com>
Date: Sat Jan 25 22:24:22 2014 +0100
intel_idle: Add CPU model 54 (Atom N2000 series)
Add CPU ID for Atom N2600/N2800 processors. Datasheets indicate support
for this, detailed information about potential quirks or limitations are
missing, though. So we just reuse the definition for the previous ATOM
series. [...]
as those processors are part of the same Atom generation as Centerton.
I think that more specific ID matching is required here.
Ben.
--
Ben Hutchings
The two most common things in the universe are hydrogen and stupidity.
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