Firstly, many thanks for your answer. That really helps a lot. I am using the ADP2 actually a google IO phone. When I did "adb shell cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governor". The result is : "ondemand, performance". It means that the sytem on my phone only supports *ondemand and performance* scaling governors. Also when I try to use "*adb shell echo userspace > /sys/devices/.../scaling_governor*", it always shows the problem that " *Permission denied*". Did you face similar problem when enable userspace governor? Would you please give me some advice on how to solve these problems? I will appreciate very very much for your help.
On Mon, Mar 22, 2010 at 1:42 PM, Mike Chan <[email protected]> wrote: > What phone did you buy? If you're talking about the Nexus One the > userspace governor is already compiled into the kernel. Otherwise > you'll probably have to recompile the kernel with the userspace > governor. > > We do DVFS using the ondemand governor currently. > > To enable userspace governor: > adb shell echo "userspace > > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor" > > To set the speed: > > adb shell echo "xxx > > /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq" > > -- Mike > > > > On Sun, Mar 21, 2010 at 11:28 PM, xlshe <[email protected]> wrote: > > I have bought the android develop phone 2. I want to do some research > > about > > power management on ADP2. But I wonder if ADP2 support Dynamic Voltage > > and > > Frequency Scaling(DVFS). That means whether we can change the CPU > > frequency > > dynamically on ADP2. Previously, someone told me that I can rebuild > > the > > android OS kernel and turn on the user space and then I can set the > > CPU > > frequency. I have tried to rebuild the kernel just as " > > http://source.android.com/documentation/building-for-dream"; said. But > > I > > still don't know how to turn on the user space when built the kernel > > and > > don't know how to set the CPU frequency on ADP2. Would you kindly give > > me > > some support on how to dynamically set the CPU frequency on ADP2? I > > will > > appreciate very very much for your support. > > > > -- > > unsubscribe: > > [email protected]<android-kernel%[email protected]> > > website: http://groups.google.com/group/android-kernel > > > > To unsubscribe from this group, send email to android-kernel+ > unsubscribegooglegroups.com or reply to this email with the words "REMOVE > ME" as the subject. > > > > -- > unsubscribe: > [email protected]<android-kernel%[email protected]> > website: http://groups.google.com/group/android-kernel > > To unsubscribe from this group, send email to android-kernel+ > unsubscribegooglegroups.com or reply to this email with the words "REMOVE > ME" as the subject. > -- unsubscribe: [email protected] website: http://groups.google.com/group/android-kernel To unsubscribe from this group, send email to android-kernel+unsubscribegooglegroups.com or reply to this email with the words "REMOVE ME" as the subject.
