http://bugzilla.kernel.org/show_bug.cgi?id=13259
Summary: Core 0 stuck in T3 throttled state from cold boot on
Clevo M720R w/ Intel T8100 CPU
Product: ACPI
Version: 2.5
Platform: All
OS/Version: Linux
Tree: Fedora
Status: NEW
Severity: normal
Priority: P1
Component: Power-Thermal
AssignedTo: acpi_power-ther...@kernel-bugs.osdl.org
ReportedBy: theholyet...@googlemail.com
Regression: No
Created an attachment (id=21249)
--> (http://bugzilla.kernel.org/attachment.cgi?id=21249)
Clevo M720R acpidump
My Clevo M720R notebook has an Intel Core 2 Duo T8100 processor. Upon boot,
Core 1 shows throttling states T0--T7 available and operates in T0, with full
performance. Core 0 on the other hand has only T3--T7 and is stuck in T3, its
performance suffering noticeably. There is no thermal reason for this, the CPU
is well within its safe temperature zone. If I booting with acpi=off, this
problem does not manifest.
After a suspend/resume cycle, both cores end up in T8 (outside the reported
available range), but both have full performance. Another difference after
suspend/resume is that CPU0 goes from SMI thermal monitoring to TM2 (Core 1 is
TM2 throughout).
This is with kernel-2.6.29.2-129.fc11.x86_64, but I believe I have seen this as
far back as roughly 2.6.24, IIRC (the first kernel I used with this notebook).
Attached are the acpidump output, /proc/acpi info before and after
suspend/resume, and a dmesg log for a session with a suspend/resume cycle.
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