Re: cpufreq oddness on 2.6.16-rc1-mm4

[Andy Isaacson <adi@hexapodia.org>]

On Mon, May 01, 2006 at 01:59:27PM -0700, Andrew Morton wrote:
> Andy Isaacson <adi@hexapodia.org> wrote:
> > On Sun, Jan 29, 2006 at 02:45:33PM -0800, Andrew Morton wrote:
> > >  git-cpufreq.patch
> > 
> > I haven't had time to debug it further, but cpufreq seems broken on my
> > Thinkpad X40 with 2.6.16-rc1-mm4.  It was working fine with
> > 2.6.15-rc5-mm3.  Automatic scaling doesn't function any more - my
> > PentiumM 1.4 GHz is fixed at 598 MHz.  And the relevant knobs in
> > /sys/devices/system/cpu/cpu0 seem to be missing.  Admittedly, I don't
>
> If this bug is still present in 2.6.17-rc3, could you please raise a report
> at bugzilla.kernel.org so we can track it?

It turned out to be a configuration issue (as expected).  My routine of
"cp ../`uname -r`/.config .config; make oldconfig" did not do the right
thing when doing that upgrade - I ended up with

# CONFIG_CPU_FREQ_GOV_ONDEMAND is not set
CONFIG_X86_SPEEDSTEP_CENTRINO=m
CONFIG_X86_SPEEDSTEP_CENTRINO_ACPI=y

which resulted in speedstep being disabled with no obvious clues what to
do to turn it on.  After some poking, I'm now running 2.6.17-rc1-mm3
with

CONFIG_CPU_FREQ_GOV_ONDEMAND=m
CONFIG_X86_SPEEDSTEP_CENTRINO=y
CONFIG_X86_SPEEDSTEP_CENTRINO_TABLE=y

and everything is working fine.

-andy