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maemo.org - Talk (https://talk.maemo.org/index.php)
-   Nokia N900 (https://talk.maemo.org/forumdisplay.php?f=44)
-   -   N900 battery life questions, issues, scenarios (https://talk.maemo.org/showthread.php?t=31020)

TA-t3 2009-12-16 15:04
Re: N900 battery life questions, issues, scenarios
 
Could you try with 'top' in an xterm and look for any process using more than a couple of percent CPU? (except for just after starting top, which by itselfs consumes some CPU).

d-iivil 2009-12-16 15:29
Re: N900 battery life questions, issues, scenarios
 
Quote:
Originally Posted by dantonic (Post 430295)
And what connections did you have on? was that with wifi/3g? and your battery still doubled?
I have 3G open all the time and no wifi connections.

I noticed I can have a little longer lasting battery if I close the 3G after surfing but the difference is minimal.

les_garten 2009-12-16 15:33
Re: N900 battery life questions, issues, scenarios
 
Quote:
Originally Posted by bdogg64 (Post 430436)
I'm running out of options besides replacing the battery or getting a new n900 which is just about impossible right now. Here is my setup..

Off the charger at 6 a.m. fully charged
Brand new SIM card
GPS completely off
Bluetooth completely off
Network mode set to GSM
Screen brightness set on lowest
Backlight timeout set to 30 seconds
Always connected to T-Mobile. Wifi set to manual, search interval set to never. Not connected to wifi at all during the day
2 desktops: 1 with facebook, calendar, media player widgets and 2 contact shortcuts. The other with nothing but shortcuts and 2 bookmarks
2 email accounts set to poll every 30 minutes
Mail 4 Exchange set to manually synchronize contacts, calendar

Usually web browsing on EDGE for a total of 1.5 hours
Maybe play 30 minutes of media

Dead by 4 p.m.

I've reflashed more than once and ran with no extras-devel apps with marginal improvement

My signal strength isnt great but I should be getting better battery life even with idle. I've pretty much scaled back the intended use of the n900. Even with light use I have yet to break more than 12 hours on a full charge.

Also, how accurate is the battery information from running "lshal | grep battery"? This morning after coming off the charger and only installing 3 updates, my battery looks full, but my percentage says 86%.

Anymore tips would be greatly appreciated.

Thanks
I noticed this as well. It was going 96% Now when it hits green, it's about 86%. I had a TREO 680 nd had to do a Battery meter calibration every so often or the meter was way off. The meter would show empty when the battery had many hours left in it.

pelago 2009-12-16 16:50
Re: N900 battery life questions, issues, scenarios
 
Quote:
Originally Posted by bdogg64 (Post 430436)
I've pretty much scaled back the intended use of the n900. Even with light use I have yet to break more than 12 hours on a full charge.
I realise you've already scaled back your intended usage, but just for troubleshooting purposes, what happens if you remove some of the desktop widgets, e.g. the Facebook and Calendar ones?

bdogg64 2009-12-16 17:41
Re: N900 battery life questions, issues, scenarios
 
Quote:
Originally Posted by pelago (Post 430630)
I realise you've already scaled back your intended usage, but just for troubleshooting purposes, what happens if you remove some of the desktop widgets, e.g. the Facebook and Calendar ones?
I've removed those and now I'm reduced to one desktop w/o widgets and only shortcuts and bookmarks. Half my battery is already gone, so we'll see how it goes the rest of the day

coopers666 2009-12-16 18:43
Re: N900 battery life questions, issues, scenarios
 
Hey Guys!

So i already tried a lot of improving my Battery...

Now i got at least 2 Days of Standby.

My Setup:

- Always connected to Vodafone Internet
- 4 Desktops with a lot of Widgets in use. BUT: NO FACEBOOK! Thatīs one of the Widgets which will drain your Battery fast!
- NO WIFI
- NO Messenger online. If i am Online with the Messenger App on Skype and ICQ my Battery drains in about 5 to 6 hours!
- Email is manual Sync.
- Light on 3
- 30 Seconds of Light Timeout.
- Bluetooth off except of Driving in my Car.

Can anybody confirm that the Messenger and the Facebook Widget will drain the Battery fast?

mihapodb 2009-12-16 19:47
Re: N900 battery life questions, issues, scenarios
 
How to get the percentage od battery? Any possiability to get mAh of battery?

bdogg64 2009-12-17 14:31
Re: N900 battery life questions, issues, scenarios
 
Ok, so I reflashed the n900 last night, didnt install any extra apps. turned off all automatic email checks, removed all desktops but 1, no widgets at all, only shortcuts, charged to full overnight.

Took it off the charger this morning, used the web browser for 45 minutes on EDGE only and my battery is already down 30%.

It may be time for the N900 to go back. I love the potential of the N900 but I think I have a lemon.

What else is there to do?

apolkosnik 2009-12-18 16:52
Re: N900 battery life questions, issues, scenarios
 
(disclaimer: don't try this if you don't understand what it does)

I've looked at the power management settings
Code:
/home/user # cat /etc/pmconfig
# Power management configuration file
enable_off_mode 1
sleep_while_idle 1
sr_vdd1_autocomp 0
sr_vdd2_autocomp 0
clocks_off_while_idle 1
voltage_off_while_idle 1
scaling_governor ondemand
scaling_max_freq 600000
scaling_min_freq 125000
sleep_ind 1
And then it looks as if they don't support 125MHz mode in the kernel: :confused:
Code:
/home/user # cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
600000 550000 500000 250000
/home/user #

So, to save a bit of the battery one can lower the max cpu freq on the next reboot by changing "scaling_max_freq 600000" to "scaling_max_freq 550000" in /etc/pmconfig

or in the live system (temporary util the next reboot):
Code:
/home/user # echo -n 550000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
So now your device can be as crippled as Droid ;)



Also, for the people with wifi problems a temporary bandaid that I've seen somewhere posted for the N8xx (YMMV):

1. create a file in /etc/network/if-post-down.d/restart_wlancond with the following contents:
Code:
#!/bin/sh
if [[ "`iwconfig wlan0|grep -c "Management:off"`" -gt 0 ]];
then
        killall wlancond
fi
2. Then make sure that it's executable by doing:
Code:
/home/user # chmod 755 /etc/network/if-post-down.d/restart_wlancond

KD Epic 2009-12-19 06:22
Re: N900 battery life questions, issues, scenarios
 
Quote:
Originally Posted by bdogg64 (Post 431925)
It may be time for the N900 to go back. I love the potential of the N900 but I think I have a lemon.

What else is there to do?
I'd probably suggest to send it back. I had an n900 that would reset every 10 seconds to 2 minutes. Reflashed it several times with different images, tried all sorts of different things, nothing worked... Finally sent it back, will be getting my new one Monday.

Lemons happen, I guess.


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