Re: [Gumstix-users] overo power management

[msinger <ms...@ea...>]

You are doing this to the pm branch?

Doing this, I get the cpufreq trees, but cpufreq-info only list 1 frequency. 
And if I try and suspend, it just hangs with no decrease in power usage.

root@overo:/sys/devices/system/cpu/cpufreq# cd /sys/power
root@overo:/sys/power# echo "mem" > state
PM: Syncing filesystems ... done.
Freezing user space processes ... (elapsed 0.00 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done.
Suspending console(s) (use no_console_suspend to debug)



amenon wrote:
> 
> Hi,
> 
> I have tried your suggestions with the current 2.6.32 kernel. I am able to
> put the system to sleep, but am unable to resume. The overo does not
> respond to either a serial console wakeup or a GPIO0_WAKEUP trigger. Was
> there anything special you needed to do to enable the 'resume' condition?
> 
> Arvind
> 
> 
> littlegert wrote:
>> 
>> Eric
>> I have been able to get the overo board to suspend to memory using power
>> saving
>> the cpufreq directory is also avilable
>> 
>> the change is in cpu-omap.c
>> //#ifdef CONFIG_ARCH_OMAP1
>> #define MPU_CLK		"mpu_ck"
>> //#else
>> //#define MPU_CLK		"virt_prcm_set"
>> //#endif
>> Then I select the powersave governor in the .config file.
>> 
>> use the command "echo mem > /sys/power/state" to go to suspend
>> The result is a low power of state of 20mA. This is not as low as I hoped
>> for but a good improvement
>> Chris
>>   
>> 
> 
> 

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