scaling_max_freq == scaling_min_freq when on battery

scaling_max_freq == scaling_min_freq when on battery

[Eugenio]

i installed ubuntu on my laptop (an asus A3500, with a pentium-m 1.6Ghz)
cpufreq works nice when on AC, switching from 600Mhz to 1.6Ghz but when
on battery it fix the frequence at 600. i tried all the
speedstep-related bios option but with no result. any hint?
thanks.

Eugenio

Re: scaling_max_freq == scaling_min_freq when on battery

[Daniel Petrini]

Hi Eugenio,

Isn't that the effect of "Powersave" governor?
Cheers,

Daniel

On 5/23/05, Eugenio <eugenio@lumachedelcervello.cjb.net> wrote:
> i installed ubuntu on my laptop (an asus A3500, with a pentium-m 1.6Ghz)
> cpufreq works nice when on AC, switching from 600Mhz to 1.6Ghz but when
> on battery it fix the frequence at 600. i tried all the
> speedstep-related bios option but with no result. any hint?
> thanks.
> 
> Eugenio
> 
> 
> _______________________________________________
> Cpufreq mailing list
> Cpufreq@lists.linux.org.uk
> http://lists.linux.org.uk/mailman/listinfo/cpufreq
> 


-- 
10LE - Linux
Nokia Institute of Tecnology - INdT
Manaus - Brazil

RE: scaling_max_freq == scaling_min_freq when on battery

[Pallipadi, Venkatesh]

This limitation must be coming from BIOS. It seems BIOS has decided not 
to let CPU run at higher than 600MHz when on battery. 

Thanks,
Venki


>-----Original Message-----
>From: cpufreq-bounces@lists.linux.org.uk 
>[mailto:cpufreq-bounces@lists.linux.org.uk] On Behalf Of Eugenio
>Sent: Monday, May 23, 2005 11:01 AM
>To: cpufreq@lists.linux.org.uk
>Subject: scaling_max_freq == scaling_min_freq when on battery
>
>i installed ubuntu on my laptop (an asus A3500, with a 
>pentium-m 1.6Ghz)
>cpufreq works nice when on AC, switching from 600Mhz to 1.6Ghz but when
>on battery it fix the frequence at 600. i tried all the
>speedstep-related bios option but with no result. any hint?
>thanks.
>
>Eugenio
>
>
>_______________________________________________
>Cpufreq mailing list
>Cpufreq@lists.linux.org.uk
>http://lists.linux.org.uk/mailman/listinfo/cpufreq
>

Re: scaling_max_freq == scaling_min_freq when on battery

[Stefan Seyfried]

On Mon, May 23, 2005 at 01:06:45PM -0700, Pallipadi, Venkatesh wrote:
> 
> This limitation must be coming from BIOS. It seems BIOS has decided not 
> to let CPU run at higher than 600MHz when on battery. 

But i have seen this on a Dell D600 too; although if i manually echoed
1700000 into scaling_max_freq, it could go up even on battery. Also,
if i suspended on battery and resumed, i could never get it to go
higher than 600MHz again, even on AC. This was a bit mysterious:
it happened more often on "userspace" governor than when i suspended on
"performance" governor and was not too easy to reproduce; now i have
switched machines and the ASUS M6ne doesn't show this behaviour.

If i find a way to reproduce it reliably (it is probably just a matter
of writing down the steps), i'll post a bugreport.
-- 
Stefan Seyfried