Just a simple question - how to max the cpu frequency while on battery?
My machine is capable of running at either 500Mhz, 1100Mhz, and 2100Mhz.
I found out that no matter what I do, while on battery, it won't run faster than 1100Mhz - whichever method I use it to set (either through gnome cpu scaling applet, or through direct setting via /sys/devices/system/cpu/cpufreq manipulation).
cpufreq-info tells me that the scaling policy is limited to 500Mhz - 1100Mhz, and trying to change that by setting scaling_max_frequency gives no error, but the value remains at 1100Mhz.
/etc/defaults/acpi-support doesn't seem to have settings to control cpu freq, and /etc/acpi/events has none as well.
rmmod-ing cpufreq and powernow-k8 doesn't seem to have any effect.
Do I miss anything? I'm quite sure that the machine is quite capable of running 2100Mhz while on battery - because the other linux distro (puppy linux) can be configured to do it (and it drains the battery like crazy and the fan sounds like jet engine, but that's another matter altogether).
While on ac power, this is not a problem, I can go to the max simply by using the gnome cpu scaling applet. The restriction only happens while I'm battery, and while I'm happy that Ubuntu tries to give me longer battery life, there are times that I must absolutely run at highest CPU speed regardless of whether I'm battery or on ac.
For information, I'm using Intrepid amd64 with HP Pavilion tx2500 tablet, which uses AMD64 Turion x2 CPU.
Any helps appreciated.