[alsa-devel] [Intel-gfx] [PATCH 0/4 V7] Power-well API implementation for Haswell

Rafael J. Wysocki rafael.j.wysocki at intel.com
Wed Jul 24 15:14:31 CEST 2013

On 7/24/2013 1:57 PM, David Henningsson wrote:
> On 07/24/2013 01:33 PM, Wang, Xingchao wrote:
>> Yes, I agree. I'm debugging this issue on Ubuntu, not sure it happens 
>> on other distribution too.
>> If it's related to Ubuntu, maybe need check Ubuntu power policy. Does 
>> anyone know the Ubuntu power-policy on laptop?
>> i.e. when charger connected, will Ubuntu make decision to disable 
>> power-save feature for audio subsystem?
> I'm not a power management expert, but I got a pointer from my team 
> mate to pm-utils:
> http://cgit.freedesktop.org/pm-utils/tree/pm/power.d/intel-audio-powersave 
> If I understand correctly, The scripts in power.d are executed when 
> battery / AC-power is changed.

To me, this sounds like a user space issue.  It requested power on and 
the kernel delivered.

Trying to modify the kernel to work around that would be insane.


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