Hi,
On 01-11-17 17:54, Takashi Iwai wrote:
On Wed, 01 Nov 2017 15:19:44 +0100,
Hans de Goede wrote:
Hi All,
I'm working on trying to improve the OOTB power-consumption
of Linux (Fedora Workstation) on laptops.
One of the easy wins here is setting snd_hda_intel.power_save=1
I see that the default is configurable through a Kconfig option,
currently Fedora is using the Kconfig default value of 0.
So I'm wondering if there any known issues with changing the
default to 1 ?
This may bring click noises on some laptops or desktops, but it should
be OK for the functionalities. On openSUSE Tumbleweed kernels, we
already pass 1 for some time. Some reports came up occasionally but
they can work around by setting the module option.
I was also thinking that maybe an automatic value
(SND_HDA_POWER_SAVE_DEFAULT == -1) might be a good idea,
which would mean 0 normally except for PCI-ids which are
markes with a MOBILE flag in their driver_data in
the azx_ids pci_device_id table ?
I'm afraid that it'd be hard to manage that table. This is one of
mostly modified module option, e.g. a power-management daemon often
adjusts the value dynamically.
So, for modern distros, feel free simply set to value 1, but I see no
reason to hustle for changing kconfig default value in the tree. For
the default value, we want to be conservative in general.
Ok, I will discuss changing the Kconfig option to "1" with the
Fedora kernel team.
Thanks & Regards,
Hans
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