http://bugzilla.kernel.org/show_bug.cgi?id=9129
Summary: Unreasonable BIOS trip points cause critical shutdown
after 4 minutes of CPUBurn
Product: ACPI
Version: 2.5
KernelVersion: 2.6.22-12
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: Power-Thermal
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: [EMAIL PROTECTED]
Most recent kernel where this bug did not occur: 2.6.20
Distribution: Ubuntu 7.10 beta
Hardware Environment: Avalue ECM-945GM embedded core duo board
Software Environment:
Problem Description:
The BIOS does not seem to communicate the correct temperature trip points to
the OS.
It sets CPU temperature trip points as:
critical: 60C
passive, 50C
active, 50C.
I am using the T7200 CPU (rated up to 100C, critical is 125C).
With 2.6.20 I can successfully override the critical trip point and with two
copies of CPUBurn running the system stabilizes at about 67C, (at ~23C room
temp), and does not suffer from shutdown.
But of course that's not an option with 2.6.22.
I would much rather be able to do that from user space. The other options
(modifying ACPI tables, turning off thermal module, preventing power down
command from running), all seem pretty hokey. Staying with the older version
fixes that problem but introduces another.
There is no fan control on this embedded system, it's always on. And there is
a requirement for the high cpu performance.
attachments to follow.
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