[maemo-users] Dealing with N900 responsiveness (or lack of thereof)

From: Paul Hartman paul.hartman+maemo at gmail.com
Date: Tue Feb 23 19:28:14 EET 2010
2010/2/23 Michel Dänzer <michel at daenzer.net>:
> On Mon, 2010-02-22 at 12:08 -0600, Paul Hartman wrote:
>> My battery seems the same as always. If I don't make any phone calls
>> it lasts around 13 hours at the most (I'm connected to wifi 90% of the
>> time, phone mostly sits idle).
> That seems very low. I can easily go for three days between charging,
> and I've gone up to slightly more than 100 hours. I rarely make phone
> calls, but I'm connected to WiFi (and logged into Skype and Jabber
> accounts) at least half the time as well and regularly do package
> installs/upgrades, SMS/IM and general tinkering.

Wow, I think a lot of people are jealous of you. :) I've never seen
anyone with that much battery life except for extreme cases (offline
mode, no usage). Or maybe the only people who complain about battery
life are people with problems and the silent majority have >24 battery

Your usage seems about the same as mine, at least during the work day.
In my case I'm not logged into any IM service, but I do have e-mail
accounts configured including MfE. In the evening I use it more,
surfing the web, updating applications, etc, usually while I'm
watching TV or something. :) But if I don't charge it during the day I
can't do that in the evening because it'll be dead before dinner.

Is Nokia Energy Profiler available for N900? It is an excellent tool
on Symbian. Powertop just doesn't convey all of the same information
(mW usage or whatever).

> When the device is (supposedly) idle, make sure that e.g. htop
> doesn't show any significant CPU usage by any process other than itself
> (and Xorg and osso-xterm, if you're running it on the device display).

I haven't noticed anything, and my load average at the moment is 0.00,
0.02, 0.00 which is good, but if I sort by time the top offenders
since my last reboot (uptime 1 day, 3:14) are:

5:41 pulseaudio
5:01 bme_RX-51
3:59 Xorg
3:42 as-daemon
3:00 dbus-daemon
2:40 hildon-desktop
2:41 pulseaudio
1:11 pulseaudio
1:08 hildon-status-menu
1:06 mafw-dbus-wrapper
1:02 hildon-home

rest are under 1:00.

I used the music player with headphones for 20 minutes this morning,
and had a 5 minute call yesterday, maybe that explains the pulseaudio

bme_RX-51 is battery monitoring service. I don't know if it uses CPU
when I'm charging, perhaps?

I believe as-daemon is MfE, so it seems it's doing a lot of work to
get my e-mails.  It is set to "Always On" during during work hours and
every 15 minutes otherwise. I also have two IMAP accounts configured
(gmail and ovi).

> I suspect the display brightness could also make a big difference for
> battery life, I have it at the lowest setting.

I can barely see the screen at lowest setting (and not at all from an
angle). Maybe if I worked in the dark I could use that. :) Mine is on
4/5 right now, anything lower just seems too dim but maybe I'll try
3/5 for a couple days and see if I notice any battery life increase.

> Also FWIW I have Bluetooth disabled and am only using GSM, not 3G, as I
> only use WiFi for internet access.

Here I don't use bluetooth ever, nor FM transmitter.

T-Mobile's signal is crap everywhere I go, perhaps that drains my
battery as well. I guess when the signal is weak, the phone has to
transmit stronger to reach the tower? Most of the time I have between
2 bars and no signal whatsoever. :(
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