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2014-09-30
, 15:49
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Posts: 4,117 |
Thanked: 8,901 times |
Joined on Aug 2010
@ Ruhrgebiet, Germany
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#22
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After having a short look into your powertop I need to say I am afraid of an HW damage/drainage (there are other examples like that on TMO).
To fully verify you would need to flash, and test again...
To fully verify you would need to flash, and test again...
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SIM-Switcher, automated SIM switching with a Double (Dual) SIM adapter
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2014-09-30
, 15:59
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Posts: 3,328 |
Thanked: 4,476 times |
Joined on May 2011
@ Poland
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#23
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What in powertop does suggest that it's hw related?
Should I do a emmc+rootfs flash, or will rootfs only suffice?
Should I do a emmc+rootfs flash, or will rootfs only suffice?
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2014-09-30
, 16:05
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Posts: 330 |
Thanked: 556 times |
Joined on Oct 2012
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#24
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Originally Posted by marmistrz
There's definitely something very wrong.
I have one account in modest (I can't imagine my life without it - I know about no other finger-friendly e-mail for N900). How did you find out that it's modest.
I don't use Skype, Google Talk is turned off.
Today the phone was standby almost all the time, (only made 2 calls straight before the battery turned dead) and even though hardly used, it lasted only 7 hours. I'll italicize it: 7 hours on standby with only GSM network
There was some time after exchaning the batteries that I had more than 2 days of uptime. Then I'd charge when battery was less than 20%. Another thing that I experienced shutdown with no possibilites to boot up with 10-15% a couple of times.
Recently I've charged to 100% after it's drained to 0% because the battery drains before I get back home...
Maybe this can help you, but it won't hurt you anyway...
My battery is over 3 years old, and about 14 months into its life, I started getting very bad battery life. I had never been very disciplined about how to charge the battery, so I decided to start doing it more consistently.
I started letting the battery drain to 0% (making sure the last few hours it drained while idle, so no high power consumption). Then, I would charge it until the LED turned green (do not let it connected overtime), and then reboot the phone (not always, but every few cycles, and definitely the first few times you follow this routine).
It seemed to work for me, as my battery life improved greatly.
The reason you want to let the last few hours of battery drain be under idle conditions is because under stress, the battery will sometimes report 0% when it actually isn't (or this is my theory based on observation, anyway).
Some people like Estel have done some serious research on N900 batteries, and they have posted very useful information in the forum.
Last edited by malfunctioning; 2014-09-30 at 16:09.
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2014-09-30
, 16:57
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Posts: 6,445 |
Thanked: 20,981 times |
Joined on Sep 2012
@ UK
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#25
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Originally Posted by malfunctioning
Sorry, what I meant was the WiFi settings: check every 10 minutes for known networks, log in automatically. Emails are checked every 30 minutes.
I think the Wifi might make some difference, but it's difficult to quantify how much. I also wonder if it would be more (or might be actually less) efficient to have an Alarmed entry to connect to Wifi, check email, and disconnect from Wifi every 10 minutes instead of leaving the Wifi on.
Of course WiFi makes a difference. When not logged in, the phone does not check for emails and software updates. That's why I specified that it was logged in for about half the time.
OP, I also suspect a HW fault. Possibly a trivial one, like an old battery.
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2014-09-30
, 17:14
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Posts: 6,445 |
Thanked: 20,981 times |
Joined on Sep 2012
@ UK
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#26
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Originally Posted by malfunctioning
A battery's internal resistance increases as it is being discharged. What it means is that the difference between voltages at low load and at high load increases. For example, a fully charged battery may show let's say 4.25V at 25mA and 4.15V at 1A, a drop of 0.1V. The same battery may show 0.5V or more drop when nearly discharged. The situation gets gradually worse as the battery ages.
The reason you want to let the last few hours of battery drain be under idle conditions is because under stress, the battery will sometimes report 0% when it actually isn't (or this is my theory based on observation, anyway).
One practical implication may be tbat a battery discharged to say 20% may suddenly drop to zero when the load suddenly increases. I had a case of a very old battery that made very distorted phone calls at 90% and rebooted the phone when a call was received at 60%.
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2014-09-30
, 17:29
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Posts: 330 |
Thanked: 556 times |
Joined on Oct 2012
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#27
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Originally Posted by pichlo
Thank you for explaining the scientifical reason for this behavior.
A battery's internal resistance increases as it is being discharged. What it means is that the difference between voltages at low load and at high load increases. For example, a fully charged battery may show let's say 4.25V at 25mA and 4.15V at 1A, a drop of 0.1V. The same battery may show 0.5V or more drop when nearly discharged. The situation gets gradually worse as the battery ages.
One practical implication may be tbat a battery discharged to say 20% may suddenly drop to zero when the load suddenly increases. I had a case of a very old battery that made very distorted phone calls at 90% and rebooted the phone when a call was received at 60%.
That old battery you mention was indeed on its last legs.
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2014-09-30
, 17:55
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Posts: 3,328 |
Thanked: 4,476 times |
Joined on May 2011
@ Poland
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#28
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Originally Posted by pichlo
The same battery seems to work nice in my spare N900. Has ~2 days of uptime if used only for playing audio tracks.
OP, I also suspect a HW fault. Possibly a trivial one, like an old battery.
Or maybe the SIM card is the one to blame?
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2014-09-30
, 18:28
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Posts: 4,117 |
Thanked: 8,901 times |
Joined on Aug 2010
@ Ruhrgebiet, Germany
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#29
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Originally Posted by marmistrz
Nothing!
What in powertop does suggest that it's hw related?
Should I do a emmc+rootfs flash, or will rootfs only suffice?
__________________
SIM-Switcher, automated SIM switching with a Double (Dual) SIM adapter
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Thank you all for voting me into the Community Council 2014-2016!
Please consider your membership / supporting Maemo e.V. and help to spread this by following/copying this link to your TMO signature:
[MC eV] Maemo Community eV membership application, http://talk.maemo.org/showthread.php?t=94257
editsignature, http://talk.maemo.org/profile.php?do=editsignature
SIM-Switcher, automated SIM switching with a Double (Dual) SIM adapter
--
Thank you all for voting me into the Community Council 2014-2016!
Please consider your membership / supporting Maemo e.V. and help to spread this by following/copying this link to your TMO signature:
[MC eV] Maemo Community eV membership application, http://talk.maemo.org/showthread.php?t=94257
editsignature, http://talk.maemo.org/profile.php?do=editsignature
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2014-10-05
, 10:33
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Posts: 3,328 |
Thanked: 4,476 times |
Joined on May 2011
@ Poland
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#30
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I'll do a full reflash as soon as I've done a full backup, but now I noticed a real weirdness.
With only X-Terminal open (similar results when closed), offline mode, no SIM, only one desktop, I switched the directory to /sys/class/power_supply/bq27200-0 and I run
The results are
During the measure the screen auto dimmed. A second measure: I ran the same script and locked the device immediately.
If we suppose that standby current is 120mA, it would mean 12 hours of uptime.
time_to_empty_avg was 11580, 12240,(locked the device now) 29400 (straight after unlocking), 12180; so in best case slightly more than 8 hours.
What's interesting, the second battery in the second device shows similar results, but they are slightly better (it was once 180 mA with screen on)
/edit: in fact the standby current is much lower on the second device.
Does it suggest a battery being worn out or some other hardware damage which doesn't have anything in common with battery?
/edit: the /sys/class/power_supply/bq27200-0/uevent file, in case if it is useful. Note the strange last line
Last edited by marmistrz; 2014-10-21 at 18:52.
With only X-Terminal open (similar results when closed), offline mode, no SIM, only one desktop, I switched the directory to /sys/class/power_supply/bq27200-0 and I run
Code:
for i in $(seq 10); do sleep 5s; cat current_now; done
Code:
278995 265251 287028 260788 267214 264358 273819 178143 135124 127449
Code:
237583 148512 124414 124414 124593 124414 124771 154759 124414 124136
time_to_empty_avg was 11580, 12240,(locked the device now) 29400 (straight after unlocking), 12180; so in best case slightly more than 8 hours.
What's interesting, the second battery in the second device shows similar results, but they are slightly better (it was once 180 mA with screen on)
/edit: in fact the standby current is much lower on the second device.
Does it suggest a battery being worn out or some other hardware damage which doesn't have anything in common with battery?
/edit: the /sys/class/power_supply/bq27200-0/uevent file, in case if it is useful. Note the strange last line
Code:
PHYSDEVPATH=/class/i2c-adapter/i2c-2/2-0055 PHYSDEVBUS=i2c PHYSDEVDRIVER=bq27x00-battery POWER_SUPPLY_NAME=bq27200-0 POWER_SUPPLY_TYPE=Battery POWER_SUPPLY_STATUS=Discharging POWER_SUPPLY_PRESENT=1 POWER_SUPPLY_VOLTAGE_NOW=3949000 POWER_SUPPLY_CURRENT_NOW=232585 POWER_SUPPLY_CAPACITY=88 POWER_SUPPLY_TEMP=296 POWER_SUPPLY_TIME_TO_EMPTY_NOW=16860 POWER_SUPPLY_TIME_TO_EMPTY_AVG=13080 POWER_SUPPLY_TECHNOLOGY=Li-ion POWER_SUPPLY_CHARGE_FULL=1243788 POWER_SUPPLY_CHARGE_NOW=1089564 POWER_SUPPLY_CHARGE_FULL_DESIGN=2056320
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Last edited by marmistrz; 2014-10-21 at 18:52.
IIRC Nokia specced the battery to last around 10 days on standby (only GSM on). I've gotten very close to that, which is surprising for a 3+ year old battery.