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* ACPI Bug report: strange behavior of temperature on Intel Core i5-430M CPU
@ 2010-02-19 12:44 lsz
  2010-02-19 15:03 ` Matthew Garrett
  0 siblings, 1 reply; 4+ messages in thread
From: lsz @ 2010-02-19 12:44 UTC (permalink / raw)
  To: linux-acpi

Hello ACPI developers,
The ACPI temperature on my Dell laptop (Intel Core i5-430M CPU) is strange.
You can not see the temperature unless you perform a "suspend to ram" operation.
This is what it shows if it is just booted (i.e. not performed any suspending).

$ cat /sys/class/thermal/thermal_zone0/temp
26800
$ cat /sys/class/thermal/thermal_zone1/temp
0

And they never change, until you perform a "suspend to ram"
(pm-suspend) operation.
After suspending and recovering, it turns to:

$ cat /sys/class/thermal/thermal_zone0/temp
26800
$ cat /sys/class/thermal/thermal_zone1/temp
51000

And the value of zone1 keep changes every several seconds, which I
think is the right temperature (51C).
But I don't know what's zone0 about.
Please fix it so that:
  1 remove useless zone0, or tell what's that about.
  2 make zone1 usable before suspending.

Thanks.

My OS is Arch Linux x86_64 (regularly updated). Here are the version
numbers of some packages:
local/acpi 1.4-2
    Linux ACPI client providing battery, AC power, and thermal readings
local/acpid 1.0.10-3
    A daemon for delivering ACPI power management events
local/acpitool 0.5.1-1
    ACPI client - replacement for apm tool
local/pmtools 20071116-1
    A small collection of ACPI power management test and investigation tools
local/kernel26 2.6.32.8-1 (base)
    The Linux Kernel and modules
local/kernel26-firmware 2.6.32.8-1 (base)
    The included firmware files of the Linux Kernel
local/kernel26-headers 2.6.32.8-1
    Header files and scripts for building modules for kernel26
local/linux-api-headers 2.6.32.5-2 (base)
    Kernel headers sanitized for use in userspace

Sizhuang Liu

^ permalink raw reply	[flat|nested] 4+ messages in thread
end of thread, other threads:[~2010-02-23  7:41 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2010-02-19 12:44 ACPI Bug report: strange behavior of temperature on Intel Core i5-430M CPU lsz
2010-02-19 15:03 ` Matthew Garrett
2010-02-20  1:38   ` lsz
2010-02-23  7:41   ` lsz

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