Re: Battery almost empty after 5 hours with locked N810
 

Yesterday, I put my N810 in the pocket (of my pants), and half an hour later, I noticed that it became warm; it still had the full battery icon. So, then, I put it in my bag after locking it again. But after a few hours, it was still warm and the battery was almost empty! The load average was low as usual. Then I charged my N810 during about one hour, so that the battery icon was showing a half-full battery. I unplugged the charger and I locked the tablet again. But after a couple of hours, the battery was completely empty (no power at all).

Re: Battery almost empty after 5 hours with locked N810
 

I had a very similar thing happen to me. For two days after the most recent ssu my N800 did almost exactly the same thing you described. Here's what I did.

1. Even though I have metalayer-crawler disabled, I had to stop it manually after the reboot. I have no idea how it got started again, but it did (I double checked and the sym link under /etc/rc2.d starts with a K, not an S).

To stop it I ran this command:

sudo /etc/init.d/metalayer-crawler0 stop


2. I reflashed the kernel (to restore screen rotation) using the 48 MHz patched kernel from http://outpo.st/rotate/

My battery drain problems have now disappeared. Right now, the battery icon says I have 9 days when idle and 7 hours when in use. I can once again use my N800 all day without running out of power.

I hope this helps.

Re: Battery almost empty after 5 hours with locked N810
 

I've just done a

update-rc.d -f metalayer-crawler0 remove

But I doubt metalayer-crawler0 is a problem here: it doesn't take CPU time, and even after I removed it before the latest reflash, the battery drain problem remained.

The problem occurred once again, and I've noticed that ifconfig output:
though wifi was off (this is the first time I look at it, so that I don't know if there is a relation). I've posted a comment about that on Bugzilla.

Re: Battery almost empty after 5 hours with locked N810
 

In general my battery performance is good but I did have some problems with the N810 left on over night even though I fully charge it before retiring. I use it for an alarm clock. One night in my sleep I recall hearing multiple times but ignoring the sound the N810 makes when it drops a connection. Apparently I'm on the hairy edge of one or more open WiFi networks. When I discovered this I checked my battery level in the morning only to see a half drained battery. Since then I set communications off-line when I go to bed. I've not seen undo battery consumption over night since then.

Re: Battery almost empty after 5 hours with locked N810
 

When the battery drained a few hours ago, I was in a movie theater where no access points are visible. Moreover I sometimes leave wifi on (on purpose) and the battery has never drained significantly in such a case.

Re: Battery almost empty after 5 hours with locked N810
 

Many symptoms can have multiple causes or aggravations. I offer my personal observations more as a stimulator of thought than an absolute solution. As a software developer I've learned that a solution to a problem frequently comes after a number of innocent suspects are considered. The process of consideration is still helpful in identifying the real culprit.

Re: Battery almost empty after 5 hours with locked N810
 

I bought an N810 with the OS2008 Version 2.2007.51-3 (I don't kown its codename but I guess is not Diablo). I have the same problem with the battery, sometimes works well (in fact I have never used it continuously 10 hours) and sometimes goes off in a couple of hours. I disabled first the bluetooth. But it did not help. Switch off / switch on seems to use more energy than just let it stand by for hours. Yesterday I disabled all led alarms. Useless. Tonight I will try with the metalayer and the wifi.

Just a couple of notes: I did never notice that the tablet was warm. And many times I left the table over my table and nobody touchs it.

Maybe is a problem with the bateries itself. Why not? Does anybody know if the same batteries are used in a different Nokia gadget?

Guigue

Re: Battery almost empty after 5 hours with locked N810
 

Yeah, the batteries in the N810 and N800 are both off-the-shelf batteries used in several Nokia devices. The N800 battery was previously used in the 7710 and several others. The N810's battery is used in several other current devices.

Re: Battery almost empty after 5 hours with locked N810
 

Thanks. And do you know if they work properly?

Guigue