Arjan van de Ven wrote:
> Randy Dunlap wrote:
>> On Thu, 6 Aug 2009 09:12:24 +0530 Ritesh Raj Sarraf wrote:
>>
>>> Hi Randy,
>>>
>>> On Thursday 06 Aug 2009 04:52:11 Randy Dunlap wrote:
>>>> +void hda_power_on(void)
>>>> +{
>>>> + FILE *file;
>>>> +
>>>> + file = fopen("/sys/module/snd_hda_intel/parameters/power_save",
>>>> "w"); + if (!file)
>>>> + return;
>>>> + fprintf(file,"1");
>>>> + fclose(file);
>>>> + if (access("/dev/dsp", F_OK))
>>>> + return;
>>>> + file = fopen("/dev/dsp", "w");
>>>> + if (file) {
>>>> + fprintf(file,"1");
>>>> + fclose(file);
>>>> + }
>>>> +}
>>>> +
>>> What is the "/dev/dsp" stuff for ?
>>> Does that too save power ?
>> Hi,
>>
>> That's certainly a good question. I just copied the powertop ac97
>> code and that's what it does.
>>
>> Hopefully someone else here can explain...
>
> the timer change for power mgmt only kicks in after the device is closed.
> which we force by open + close action.
or that, thanks Arjan.
I added a comment about this in SVN, seems useful to document that.
Auke
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