Thank you very much for your answer. But when I try to run "adb root", it shows the message "adbd cannot run as root in production builds". Can you tell me how to solve this problem? My phone is ADP2. Thank you very much~
On Tue, Mar 23, 2010 at 3:22 PM, Mike Chan <m...@android.com> wrote: > You need root access to change cpufreq values. I'm not sure if this is > available on the Google IO devices but try: > > adb root > > to switch into root mode, or adb su <foo> > > userspace is not compiled into the kernel for the ADP2, you will need > to either compile a custom kernel, or just pin the min/max speeds to > the speed you wish to set. > > -- Mike > > > > On Tue, Mar 23, 2010 at 1:16 PM, ecss utdallas <dianyuangua...@gmail.com> > wrote: > > 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 <m...@android.com> 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 <dianyuangua...@gmail.com> > 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: > >> > android-kernel+unsubscr...@googlegroups.com<android-kernel%2bunsubscr...@googlegroups.com> > >> > 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: > >> android-kernel+unsubscr...@googlegroups.com<android-kernel%2bunsubscr...@googlegroups.com> > >> 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: > > android-kernel+unsubscr...@googlegroups.com<android-kernel%2bunsubscr...@googlegroups.com> > > 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: > android-kernel+unsubscr...@googlegroups.com<android-kernel%2bunsubscr...@googlegroups.com> > 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: android-kernel+unsubscr...@googlegroups.com 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.
