KOReader sleep mode complete battery drain

maximus83 · 01-26-2019, 11:43 AM

I had a rather strange issue happen this morning with my new Clara, which is also running KOReader.

I had been reading a book yesterday afternoon in KOReader, with ~95% battery available, and let the reader go into sleep mode with the book still open.

Overnight, the battery had drained completely to zero.

Is that a known issue, or is it more likely something to do with my hardware and not with KOReader?

ETA: I didn't observe this issue prior to installing KOReader, and my settings in the Kobo software were factory default as in Sleep 10 mins, Shutdown never.

ilovejedd · 01-26-2019, 02:19 PM

I actually noticed the same thing just recently on my PW4.

I normally exit KOReader and enable airplane mode when I'm done. Yesterday, only meant to take a short break from reading but became busy and the PW4 battery drained from ~80% to ~30% in, I believe, just 6 hours?

Stock reader, battery drain on the PW4 is worse compared to the PW3 but I don't believe it's quite 50% in only 6 hours bad.

Alan_S · 01-26-2019, 04:01 PM

It seems that problem with battery drain in some cases isn't 100% solved. Before it was more common occurrence, now it is very rare (I didn't had it on my device for a long, long time).

What builds you have? Latest nightly, or something very old?

Frenzie · 01-26-2019, 04:13 PM

There's almost nothing in common between Kobo and Kindle as far as suspending the device goes.

Quote:

Is that a known issue, or is it more likely something to do with my hardware and not with KOReader?

Well, the known issue is that Kobo suspend is… weird. Since the Clara is fairly new it's possible that it's weird in new and unique ways. Were you able to get a crash.log?

maximus83 · 01-26-2019, 05:14 PM

Quote:

Originally Posted by Frenzie

Well, the known issue is that Kobo suspend is… weird. Since the Clara is fairly new it's possible that it's weird in new and unique ways. Were you able to get a crash.log?

KOReader version: v2019.01.1-1-g2009ffa_2019-01-10

Crash log attached. If there is anything, it'd be from yesterday or today, I'm not sure what I'm looking for as I see a lot of messages in there.

Like I noted above, the one thing that seems a little coincidental, is that sleep mode was working fine for several days prior to installing KOReader.

Frenzie · 01-27-2019, 04:43 AM

What we're looking for is one of the sleep related sections:

Code:

01/24/19-22:01:37 INFO Kobo WiFi: disabling WiFi
01/24/19-22:01:53 INFO Kobo suspend: going to sleep . . .
01/24/19-22:01:53 INFO Kobo suspend: asked the kernel to put subsystems to sleep, ret: true
01/24/19-22:01:55 INFO Kobo suspend: waited for 2s because of reasons...
01/24/19-22:01:55 INFO Kobo suspend: synced FS
01/24/19-22:01:55 INFO Kobo suspend: asking for a suspend to RAM . . .
01/24/19-22:01:55 INFO Kobo suspend: ZzZ ZzZ ZzZ? Write syscall returned: true
01/25/19-00:41:09 INFO Kobo suspend: woke up!
01/25/19-00:41:24 ERROR Kobo suspend: putting device back to sleep, unexpected wakeups: 1
01/25/19-00:41:24 INFO Kobo suspend: going to sleep . . .
01/25/19-00:41:24 INFO Kobo suspend: asked the kernel to put subsystems to sleep, ret: true
01/25/19-00:41:26 INFO Kobo suspend: waited for 2s because of reasons...
01/25/19-00:41:26 INFO Kobo suspend: synced FS
01/25/19-00:41:26 INFO Kobo suspend: asking for a suspend to RAM . . .
01/25/19-00:41:26 INFO Kobo suspend: ZzZ ZzZ ZzZ? Write syscall returned: true
01/25/19-01:41:25 INFO Kobo suspend: woke up!
01/25/19-01:41:40 ERROR Kobo suspend: putting device back to sleep, unexpected wakeups: 2
01/25/19-01:41:40 INFO Kobo suspend: going to sleep . . .
01/25/19-01:41:40 INFO Kobo suspend: asked the kernel to put subsystems to sleep, ret: true
01/25/19-01:41:42 INFO Kobo suspend: waited for 2s because of reasons...
01/25/19-01:41:42 INFO Kobo suspend: synced FS
01/25/19-01:41:42 INFO Kobo suspend: asking for a suspend to RAM . . .
01/25/19-01:41:42 INFO Kobo suspend: ZzZ ZzZ ZzZ? Write syscall returned: true
01/25/19-07:36:20 INFO Kobo suspend: woke up!
01/25/19-07:36:35 ERROR Kobo suspend: putting device back to sleep, unexpected wakeups: 3
01/25/19-07:36:35 INFO Kobo suspend: going to sleep . . .
01/25/19-07:36:35 INFO Kobo suspend: asked the kernel to put subsystems to sleep, ret: true
01/25/19-07:36:37 INFO Kobo suspend: waited for 2s because of reasons...
01/25/19-07:36:37 INFO Kobo suspend: synced FS
01/25/19-07:36:37 INFO Kobo suspend: asking for a suspend to RAM . . .
01/25/19-07:36:37 INFO Kobo suspend: ZzZ ZzZ ZzZ? Write syscall returned: true
01/25/19-08:11:31 INFO Kobo suspend: woke up!
01/25/19-08:11:31 INFO Kobo resume: clean up after wakeup
01/25/19-08:11:31 INFO Kobo resume: unflagged kernel subsystems for resume, ret: true

It's not clear to me if that is the one you're talking about, but you've definitely got some kind of problem when seeing stuff like failing to suspend 20 times:

Code:

01/25/19-12:25:30 ERROR Kobo suspend: putting device back to sleep, unexpected wakeups: 20

Do you have a sleep cover?

https://www.mobileread.com/forums/sh...d.php?t=310518

maximus83 · 01-27-2019, 10:53 AM

No sleep cover.

Alan_S · 01-27-2019, 04:01 PM

Maybe some other magnets near reader?

NiLuJe · 01-27-2019, 05:52 PM

In the Kindle case, we rely entirely on the system, so I'm going to chuck that one in the generic "Kindle FW doing weird crap in the BG" bin

.

I haven't seen anything weird on the Forma (which should be similar to the Clara, as far as this is concerned) as far as sleep is concerned, but I'm not a good test-case on that front, as I barely ever let the device sleep outside of Nickel.

ilovejedd · 01-27-2019, 06:19 PM

Quote:

Originally Posted by NiLuJe

In the Kindle case, we rely entirely on the system, so I'm going to chuck that one in the generic "Kindle FW doing weird crap in the BG" bin

.

Thanks. I noticed it was just the PW4 with the issue. I have a couple other PW3s with KOReader installed and those seem to be working fine.

Hmm is sleep cover an issue with Kindles, too? I use a sleep cover on my PW4 but just neoprene or faux leather sleeves for my PW3s. Then again, could be firmware versions as well. The PW4 is on 5.10.2 while the PW3s are on 5.8.x or 5.9.6.1.

NiLuJe · 01-27-2019, 07:57 PM

I don't remember if there were any sleepcover related quirks on Kindle, as I've never used one (sleep cover, that is ;p), but I wouldn't think so? Either it works or it doesn't, but there shouldn't be any weird "might wake up and do horribly weird stuff" quirks like on Kobo

.

01-26-2019, 11:43 AM	#1
maximus83 Nameless Being	KOReader sleep mode complete battery drain I had a rather strange issue happen this morning with my new Clara, which is also running KOReader. I had been reading a book yesterday afternoon in KOReader, with ~95% battery available, and let the reader go into sleep mode with the book still open. Overnight, the battery had drained completely to zero. Is that a known issue, or is it more likely something to do with my hardware and not with KOReader? ETA: I didn't observe this issue prior to installing KOReader, and my settings in the Kobo software were factory default as in Sleep 10 mins, Shutdown never. Last edited by maximus83; 01-26-2019 at 12:08 PM.

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01-26-2019, 02:19 PM	#2
ilovejedd hopeless n00b Posts: 5,111 Karma: 19597086 Join Date: Jan 2009 Location: in the middle of nowhere Device: PW4, PW3, Libra H2O, iPad 10.5, iPad 11, iPad 12.9	I actually noticed the same thing just recently on my PW4. I normally exit KOReader and enable airplane mode when I'm done. Yesterday, only meant to take a short break from reading but became busy and the PW4 battery drained from ~80% to ~30% in, I believe, just 6 hours? Stock reader, battery drain on the PW4 is worse compared to the PW3 but I don't believe it's quite 50% in only 6 hours bad.

01-26-2019, 04:01 PM	#3
Alan_S Evangelist Posts: 440 Karma: 1084584 Join Date: Aug 2007 Location: Sisak, Croatia Device: Kobo Aura H2O, Kobo Aura ONE	It seems that problem with battery drain in some cases isn't 100% solved. Before it was more common occurrence, now it is very rare (I didn't had it on my device for a long, long time). What builds you have? Latest nightly, or something very old?

01-27-2019, 10:53 AM	#7
maximus83 Nameless Being	No sleep cover.

01-27-2019, 04:01 PM	#8
Alan_S Evangelist Posts: 440 Karma: 1084584 Join Date: Aug 2007 Location: Sisak, Croatia Device: Kobo Aura H2O, Kobo Aura ONE	Maybe some other magnets near reader?

01-27-2019, 05:52 PM	#9
NiLuJe BLAM! Posts: 13,477 Karma: 26012494 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	In the Kindle case, we rely entirely on the system, so I'm going to chuck that one in the generic "Kindle FW doing weird crap in the BG" bin . I haven't seen anything weird on the Forma (which should be similar to the Clara, as far as this is concerned) as far as sleep is concerned, but I'm not a good test-case on that front, as I barely ever let the device sleep outside of Nickel.

01-27-2019, 07:57 PM	#11
NiLuJe BLAM! Posts: 13,477 Karma: 26012494 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	I don't remember if there were any sleepcover related quirks on Kindle, as I've never used one (sleep cover, that is ;p), but I wouldn't think so? Either it works or it doesn't, but there shouldn't be any weird "might wake up and do horribly weird stuff" quirks like on Kobo .

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