Bug#401979: /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq not working properly on Centrino Banias
On Thu, Dec 07, 2006 at 06:15:12AM +0200, Jos?ɜ Antonio Insua wrote:
> Package: linux-image-2.6.18-3-686
> Version: 2.6.18-7
>
> Hello!
>
> I'm not able to set /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq to
> more than 1000 MHz ( the max frequency of my CPU is 1500 MHz ).
>
> I am using Debian Etch with the 2.6.18-3-686 precompiled kernel from unstable
> in an IBM X31 laptop ( Centrino Banias 1500 MHz ).
>
> At the end comes the result of cat /proc/cpuinfo, lspci and dmesg in my
> machine.
>
> I'm able to solve the problem compiling a new kernel without the option
> X86_SPEEDSTEP_CENTRINO_ACPI. The needed option is
> X86_SPEEDSTEP_CENTRINO_TABLE. I'm also experimenting the problem when I
> compile the kernel with both options.
>
> I would gladly help you in anything I can.
Don't know if it applies or is valid, but it sounds like this patch
could help there:
ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.19-rc6/2.6.19-rc6-mm2/broken-out/cpufreq-fix-bug-in-duplicate-freq-elimination-code-in-acpi-cpufreq.patch
--
mattia
:wq!
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