http://bugzilla.kernel.org/show_bug.cgi?id=11352
------- Comment #7 from [EMAIL PROTECTED] 2008-08-18 18:51 -------
Hi, Juan
Thanks for the info.
It seems that this issue is related with the BIOS. There is no
_PSS/_PCT/_PPC object in acpi table, which is required by acpi_cpufreq driver.
As the CPU is Penryn T9300, the speedstep-ich cpufreq driver is also
inappropriate. In such case no cpufreq driver is loaded successfully. So the
cpufreq scaling can't work in Linux.
Will you please check whether there exists the BIOS option related with
cpufreq in BIOS ? If yes, please enable it and see whether it can work.
At the same time there is no _CST/_CSD object and the C2/C3 latency defined
in FADT table is above the predefined max latency. So the C-states also can't
work on this system.
>C2 Latency : 0065 The max latency for C2 is 100.
>C3 Latency : 03E9 The max latency for C3 is 1000.
But it is strange that cpufreq scaling can work on windows. Maybe the
addition SSDT table is provided on windows, on which the _PSS/_PCT/_PPC object
is defined.
Will you please check whether there is new version BIOS?
In the dmesg log there exists the following message:
> [ 44.199399] Error attaching device data
> [ 44.199459] Error attaching device data
Will you please try the latest kernel (for example : 2.6.26) and see whether
the message still exists?
Thanks.
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