Thanks for the information.
Some initial thoughts follow.
>From dmesg:
1/ Your PC appears to be a Clevo 5600D. Also marketed by Toshiba as a T40e &
Sager 5600D (and probably others). Clevo is probably the manufacturer. This may
help when your searching google for possible work-arounds.
2/ [ 23.527515] ACPI: Clevo 5600D detected - limiting to C2 max_cstate.
Override with "processor.max_cstate=9"
[ 23.527521] ACPI: processor limited to max C-state 2
[ 23.527740] ACPI: CPU0 (power states: C1[C1] C2[C2])
[ 23.527746] ACPI: Processor [CPU0] (supports 8 throttling states)
The first line here appears to be the result of a kernel patch. See here:
http://lkml.org/lkml/2006/1/4/331
This patch has been included as a work around for a locking-up problem with the
Clevo 6500D.
This should not matter with regard to the issue you've reported but it's worth
noting.
3/ dmesg shows:
[ 20.926398] CPU0: Intel(R) Pentium(R) 4 CPU 2.53GHz stepping 04
[ 20.926405] SMP motherboard not detected.
[ 20.926408] Local APIC not detected. Using dummy APIC emulation.
[ 20.926463] Brought up 1 CPUs
[ 20.926484] CPU0 attaching sched-domain:
[ 20.926488] domain 0: span 01
[ 20.926490] groups: 01
[ 20.926742] net_namespace: 64 bytes
I would assume that being a Pentium 4 that 2 CPUs were brought up. Perhaps
Pentium 4s on laptops are structured differently??
While dmidecode shows:
Handle 0x0004, DMI type 4, 35 bytes
Processor Information
Socket Designation: U49
Type: Central Processor
Family: Unknown
Manufacturer: Intel
ID: 24 0F 00 00 FF F9 EB 3F
Version: A0
Voltage: 1.8 V
External Clock: Unknown
Max Speed: 1500 MHz
Current Speed: 2500 MHz
Status: Populated, Enabled
Upgrade: Slot 1
L1 Cache Handle: 0x0005
L2 Cache Handle: 0x0006
L3 Cache Handle: Not Provided
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
Note that max speed is less than current speed. This maybe causing confusion
with apps attempting to deal with reporting or modifying throttling. Just a
guess at this point.
It seems to me that these issues likely stem from a poorly constructed DSDT in
BIOS.
Will pass on to the Kernel-ACPI Team for a closer look.
--
'cpuinfo' says 9999 MHz & scaling not working on P4 laptop
https://bugs.launchpad.net/bugs/225319
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