Newer laptops & CPU speed

Joerg Dorchain joerg at
Wed Mar 16 01:03:30 EST 2005

On Mon, Mar 14, 2005 at 01:33:42PM +1100, Benjamin Herrenschmidt wrote:
> It seems the new laptops are booting with CPU set to low
> speed. /proc/cpuinfo outputs the wrong fequency (thinks it's high speed)
> but bogomips shows that it's running at about half speed. This patch
> against 2.6.11 (will not apply on 2.6.10) adds proper cpufreq support so
> that the boot speed is recognized (fixing /proc/cpuinfo output) and so
> you can acutally use cpufreq interface & utilities to switch to full
> speed (I recommend powernowd).
> This is completely untested as I don't have access to any of those new
> models yet, so I'm waiting for some feedback before submitting upstream.

My ibook G4 boots at low speed. /proc/cpuinfo shows 666MHz and a smiliar
bogomips value. Nevertheless, the cpu frequency scaler works, i.e. set
it to performance to be at high speed after boot up, or, as I currently
do, use the userspace governor and powernowd. All this is without your
patch (Did not try it yet, my ibook lacks internet) on linus' 2.6.11.



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