Power Saving modes on BBB?

Gábor Paller gaborpaller at gmail.com
Thu Jul 30 07:45:25 UTC 2015

Am I right that the entire cpufreq subsystem is also disfunctional on
Snappy BBB?
Snappy consumes 40% more current on idle prompt (boot completed, no user
task is running) than the baseline TI SDK and I can't find the frequency
scaling files under /sys.

Also, bizarrely, if the BBB is entirely shut down, Snappy still consumes
around 120 mA while TI SDK goes down to almost 0.

This, along with the lack of power-saving modes is pretty much a
showstopper for any serious battery-operated application on Snappy.


On Fri, Jul 24, 2015 at 3:57 PM, Paolo Pisati <paolo.pisati at canonical.com>

> On Thu, Jul 23, 2015 at 6:27 PM, Gábor Paller <gaborpaller at gmail.com>
> wrote:
> > root at localhost:~# uname -a
> > Linux localhost.localdomain 3.19.0-18-generic #18-Ubuntu SMP Tue May 19
> > 18:34:38 UTC 2015 armv7l armv7l armv7l GNU/Linux
> I'm looking into this, but this is as good as upstream goes - if you
> want better PM support you should consider using the official TI
> kernel:
> https://git.ti.com/ti-linux-kernel/ti-linux-kernel/trees/master
> albeit i'm facing problems there too.
> Can you open an LP bug for this so we track the development?
> Thanks.
> --
> bye,
> p.
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