http://bugzilla.kernel.org/show_bug.cgi?id=9754
Summary: Sensors not updated causing CPU to heat after
suspend/hibernate on laptop acer aspire 5315
Product: ACPI
Version: 2.5
KernelVersion: 2.6.22
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Thermal
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
Latest working kernel version: None AFAIK.
Earliest failing kernel version: All, I reckon. I have tested with 2.6.22, 32
bits, and it is reported to occur on 64 bits as well.
Distribution: Ubuntu 7.10 Gutsy
Hardware Environment: Acer Aspire 5315 (bug caused by vendor hardware specific
to Acer, causing problems to Windows too).
Problem Description:
CPU heat sensor is not updated on Acer aspire 5315 when you return from suspend
or hibernate.
'cat /proc/acpi/thermal_zone/TZ01/temperature' always returns 55°C, but the
CPU is actually heating, and the CPU fan is never started: eventually the
computer shuts down unexpectedly. This can take more or less time depending on
whether you are using it intensively or not, but it may even occur when simply
using OpenOffice.org.
Under normal conditions (i.e. when you start from a fresh boot) the sensors are
updated correctly and the CPU fan runs.
It is important to note that even on Windows (both XP and Vista), acer provides
a tool ("Empowering management") that is required to run the computer, and that
appear to do this trick: start the CPU fan (or update the sensors) when you
have returned from suspend. So it's not completely Linux's fault.
As everything is going right from a fresh boot, I guess it is possible to fix
this problem. The system should (for example) be able to reload the sensor
module when returning from suspend. This laptop was widely sold this because
because of its low-cost in both the US and Europe, so it would be nice to
support it.
Steps to reproduce:
Make your laptop suspend or hibernate, resume and wait for a quite long time
(or make your CPU work intensively for a while).
Additional information:
Reported on Ubuntu's Launchpad here:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/182929
I was told there to report this bug here since it is not distribution-specific
and requires a real code modification.
And details can be found on Ubuntu forums:
http://ubuntuforums.org/showthread.php?t=604158
Thanks for all, and please just ask if you need more
--
Configure bugmail: http://bugzilla.kernel.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug, or are watching the assignee.
-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
_______________________________________________
acpi-bugzilla mailing list
acpi-bugzilla@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/acpi-bugzilla
