Kernel Power
Contents |
Kernel for Power Users
The enhanced kernel "kernel-power" is compatible with PR1.2, contain lots of additional features (IPv6, NAT etc) and bugfixes. The kernel can be installed via Application manager from the System section. Installation of the customization package Kernel-Power-Settings is sufficient, as it depends on the kernel page.
Note: This page is under construction and based on the overclocking instructions. Hence the heavy bias to overclocking. For overclocking it includes a large set of possible frequencies (125MHz-1.15GHz) which you manually set and try out without flashing a new kernel. The defaults are set to the standard 250-600MHz range.
Changes between versions are announced on the garage page.
Installation of the kernel
This kernel makes it possible to dynamically change the maximum frequency up to 1.15GHz (supported frequencies are 125,250,500,550,600,700,750,805,850,900,950,1000,1100,1150MHz). WARNING: Overclocking may damage your device and is at your own risk! It may void your warranty and destroy your data. You have been warned.
talk.maemo.org: Discussion of the enhanced kernel
Note: all commands on this page must be run as root in X Terminal (install rootsh package and enter "sudo gainroot")
Installation of the more stable kernel (maemo24) from extras-testing
With this kernel you can change the frequency limits, the voltages and DSP frequencies online. It requires firmware PR1.1 or newer.
- Install the package
kernel-power-settings(section system in Application manager). It will automatically also installkernel-power-flasher. - shutdown and boot again. There's no need for reflashing etc.
See below for configuration information
Installation of the experimental kernel (maemo25) from extras-devel
This kernel version contains additional experimental features and patches. Changelogs are posted on Garage.
- Install the package "Enhanced kernel for power users" (section system in HAM).
- shutdown and boot again. There's no need for reflashing etc.
Read the instructions for the stable kernel for more information.
Verification of proper installation
First verify, that the kernel is actually running:
uname -r
should return "2.6.28.10power-omap1" It it does not, you should reboot or try to install again
apt-get install --reinstall -y kernel-power kernel-power-flasher
reboot, and test again.
Upgrade from older versions (< maemo24)
The kernel package was previously called kernel-flasher-maemo. Unfortunately Application Manager does not support package transitions. If you have one of the older packages installed it is recommended that you upgrade in X Terminal
sudo gainroot apt-get install -y kernel-power-flasher apt-get remove kernel-flasher-maemo
If the new kernel still doesn't boot up, try
apt-get install --reinstall -y kernel-power kernel-power-flasher
Also try other hints for deinstalling the old package.
Make sure you reset /etc/pmconfig to the defaults:
# Power management configuration file enable_off_mode 1 sleep_while_idle 1 sr_vdd1_autocomp 0 sr_vdd2_autocomp 0 clocks_off_while_idle 1 voltage_off_while_idle 1 scaling_governor ondemand scaling_max_freq 600000 scaling_min_freq 125000 sleep_ind 1
Deinstallation
sudo gainroot apt-get install --reinstall -y kernel kernel-flasher apt-get remove kernel-power kernel-power-modules
Holding a specific kernel version
If your manually installed kernel should be not upgraded to the one in extras* try this:
echo kernel-power-flasher hold | dpkg --set-selections echo kernel-power hold | dpkg --set-selections echo kernel-power-modules hold | dpkg --set-selections
to unlock the version:
echo kernel-power-flasher install | dpkg --set-selections echo kernel-power install | dpkg --set-selections echo kernel-power-modules install | dpkg --set-selections
Configuring the kernel settings
For more details on voltages read Overclocking#Voltage_tables.
Make sure the packages kernel-power-settings and rootsh are installed. All commands need to be run as root user. If you are normal user in X Terminal enter "sudo gainroot".
1) to try a configuration (you can replace "ideal" with default, lv, ulv, xlv or specify a file you created based on the template /usr/share/kernel-power-settings/default )
/usr/sbin/kernel-load /usr/share/kernel-power-settings/ideal
Note: do NOT modify the files in /usr/share/kernel-power-settings/! see 'Creating your own configuration: below.
2) to permanently install a default configuration
rm -f /etc/default/kernel-power ln -s /usr/share/kernel-power-settings/ideal /etc/default/kernel-power
3) or your own config
rm -f /etc/default/kernel-power cp <filename> /etc/default/kernel-power
4) and to immediately apply it
/usr/sbin/kernel-load
For beginners: first reboot. then try 1) and check whether the device is stable. then do 2).
Creating your own configuration 5) copy the template to your mydocs (when not in mass storage mode)
cp /usr/share/kernel-power-settings/ideal /home/user/MyDocs/kernel.txt
6) edit the file /home/user/MyDocs/kernel.txt. The defaults are
#UP_THRESHOLD=75 #SAMPLING_RATE=150000 VDD1_OPPS_VSEL="30 30 38 48 54 48 60 60 60 60 60 60 60 72 72" DSP_OPPS_RATE="90 90 180 360 400 430 430 430 430 500 500 500 500 520 520" MIN_FREQ=250000 MAX_FREQ=599000 SMARTREFLEX_VDD1=0 SMARTREFLEX_VDD2=0
For changing the frequency range change MIN_FREQ/MAX_FREQ (see "Temporary change of the frequency limits" below ). Either edit the file with an editor on your device (e.g., leafpad) or USB mount it to edit it on the PC. unmount and unplug USB. After editing load the configuration with
/usr/sbin/kernel-load /home/user/MyDocs/kernel.txt
and repeat 6) until you're happy.
7) to permanently install this new configuration
rm -f /etc/default/kernel-power cp /home/user/MyDocs/kernel.txt /etc/default/kernel-power /usr/sbin/kernel-load
8) to reset the device to the defaults use
rm -f /etc/default/kernel-power /usr/sbin/kernel-load /usr/share/kernel-power-settings/default
Note: the package automatically detects whether a certain misconfiguration has caused reboot loop. It your device reboots twice within 5 minutes, it will load the default settings (250-600Mhz) so that you can fix or remove the invalid configuration file. This also means that, when for some reason you manually reboot too quickly (<5min) your configuration will not be loaded. To load it nonetheless run after booting
/usr/sbin/kernel-load
Temporary change of the frequency limits
sudo gainroot echo 250000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq echo 599000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
The last line shows which values were actually set. To set 125MHz use 124999, for 600MHz 599999, for everthing else x000 with x=MHz. This setting takes effect immediately and is cleared with the next reboot.
Permanent configuration of the frequency limits
WARNING: Permanent overclocking is very dangerous!
Install kernel-power-settings and follow the above instructions.
Battery
In kernels version >=maemo20 you can read out the current battery info:
modprobe bq27x00_battery cat /sys/class/power_supply/bq27200-0/capacity cat /sys/class/power_supply/bq27200-0/voltage_now cat /sys/class/power_supply/bq27200-0/current_now cat /sys/class/power_supply/bq27200-0/temp
- 'capacity' value in percentage of battery level.
- 'voltage_now' value in mV of battery voltage level.
- 'current_now' value in mA of battery current consumption. (???)
- 'temp' value in degrees C of battery temperature.
To remove this kernel module use:
modprobe -r bq27x00_battery
or reboot.
Remarks
- The screen calibration in settings crashes immediately. It is a known bug in the calibration app, not in the kernel. It's mentioned in the kernel package description and is due to additional evdev (joystick,mouse) support. Just calibrate once with the stock kernel before you install the fully featured kernel.
- The kernel supports 125MHz but this frequency is disabled by default in avoid_frequencies. In version <25, it is enabled by specifying "124999", in later versions it is disabled in /sys/devices/system/cpu/cpu0/cpufreq/ondemand/avoid_frequencies and can be enabled with
echo > /sys/devices/system/cpu/cpu0/cpufreq/ondemand/avoid_frequencies
- similarily, individual frequencies can be disabled in >=v25
echo 125000 250000 750000 > /sys/devices/system/cpu/cpu0/cpufreq/ondemand/avoid_frequencies
- even if 125Mhz is disabled, the telephone app will always try to set the minimum freq. to 125Mhz after a phone call, but it is ignored unless you enable 125Mhz.
- if you enable 125MHz also set "echo 1 > /sys/devices/system/cpu/cpu0/cpufreq/ondemand/ignore_nice_load" hint
- the 125MHz issue
- Installing another version of the enhanced kernel will just overwrite the older version. The stock kernel modules are preserved so that you can simply reflash the stock kernel via USB.
- If you for some reason get errors like this during removal or installation "rm: cannot remove '/lib/modules/2.6.28.10maemo-lv-omap1/modules.*': No such file or directory".try this workaround. There was a bug in one of the early LV kernels but it should be fixed in more recent versions.
- This kernel will not conflict with the future PR1.2 upgrade. The upgrade will, however, overwrite this kernel and you'll have to install it again.