From mboxrd@z Thu Jan  1 00:00:00 1970
Content-Type: multipart/mixed; boundary="===============7671056994750078952=="
MIME-Version: 1.0
From: Marc MERLIN <marc_powertop at merlins.org>
Subject: Re: [Powertop] Lenovo T530 battery saving
Date: Tue, 13 Aug 2013 09:36:02 -0700
Message-ID: <20130813163602.GB11626@merlins.org>
In-Reply-To: 20130802172738.GC6932@merlins.org
To: powertop@lists.01.org
List-ID: <powertop@lists.01.org>

--===============7671056994750078952==
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable

Mmmh, is there anyone here? Should I be sending this elsewhere?

Thanks,
Marc

On Fri, Aug 02, 2013 at 10:27:38AM -0700, Marc MERLIN wrote:
> Both powertop 2.1 and now powertop 2.4 tell me my onboard laptop camera =

> is burning battery.
> This is a lenovo T530 with kernel 3.9.5.
> =

> However, I've unloaded the module and that doesn't help:
> =

> To save battery, I do:
> ifconfig eth0 down
> for i in videobuf2_core uvcvideo videodev e1000e
> do
>     rmmod $i
> done
> =

> =

> The battery reports a discharge rate of 14.5 W
> The estimated remaining time is 2 hours, 8 minutes
> =

> Summary: 681.7 wakeups/second,  2.0 GPU ops/seconds, 0.0 VFS ops/sec and =
19.4% CPU use
> =

> Power est.              Usage       Events/s    Category       Description
>   6.13 W     73.3%                      Device         Display backlight
>   3.08 W    100.0%                      Device         USB device: Integr=
ated Camera (Chicony Electronics Co., Ltd.)
>  71.2 mW    149.9 ms/s     240.0        Process        /usr/bin/enlighten=
ment
>  24.0 mW    175.6 =C2=B5s/s     144.5        Timer          menu_hrtimer_=
notify
>  12.5 mW      1.0 ms/s      75.5        kWork          od_dbs_timer
>  12.1 mW     98.3 =C2=B5s/s      72.9        Process        [kworker/2:0]
> =

> =

> Yet, powertop is still showing this below which is still visible in lsusb=
 after I unload
> uvcvideo:
> Bus 003 Device 004: ID 04f2:b2ea Chicony Electronics Co., Ltd =

> =

> I often have the same problem with my audio device too:
>   1.88 W    100.0%                      Device         Audio codec alsa:h=
wC0D0: thinkpad (Realtek)
> =

> Thankfully unloading some modules seems to fix this:
> for i in snd_hda_intel snd_hda_codec_realtek snd_hda_codec snd_hwdep; do =
rmmod $i; done
> =

> Any idea how I can stop the camera from sucking power since unloading the=
 module isn't enough?
> =

> Thanks,
> Marc

-- =

"A mouse is a device used to point at the xterm you want to type in" - A.S.=
R.
Microsoft is to operating systems ....
                                      .... what McDonalds is to gourmet coo=
king
Home page: http://marc.merlins.org/ =20

--===============7671056994750078952==--