04-06-2019, 06:18 AM | #1 |
Illiterate
Posts: 1
Karma: 10
Join Date: Apr 2019
Device: PW4
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Completely shut down a PW4
Greetings, thank you all for your hard work! The following questions have partly been answered for older devices but not specifically for the PW4 (unless I'm blind).
What would happen if I issued a poweroff command from the command line on a jailbroken kindle paperwhite 4 (2018)? Would doing that entail the risk of bricking the device or losing the jailbreak or other miseries that could be considered harmful/undesirable (like losing data, etc.)? What would have to be done to start it up again afterwards? Is it even possible? How long would it take? Does it even make sense to attempt doing that? |
04-06-2019, 10:22 AM | #2 | |||
hopeless n00b
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Join Date: Jan 2009
Location: in the middle of nowhere
Device: PW4, PW3, Libra H2O, iPad 10.5, iPad 11, iPad 12.9
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Quote:
Code:
#!/bin/sh exec shutdown -P now Quote:
Quote:
Long term storage, sure. For example, I bought extra Kindles that could be jailbroken for backup purposes that are just sitting in a drawer unused for months on end. Makes sense to turn those off. Normal usage, just stick to standby. |
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04-06-2019, 08:26 PM | #3 |
just an egg
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Join Date: Mar 2015
Device: Kindle, iOS
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This is intriguing. But before I risk messing things up, can you tell me if my understanding is correct?
This will power down my Kindle completely? Not just sleeping anymore? And this will work on a non-jailbroken Kindle? Thank you! |
04-06-2019, 08:51 PM | #4 |
Going Viral
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Location: Central Texas
Device: No K1, PW2, KV, KOA
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*) Yes
*) Yes + do you mean to include "Start USB networking" here? *) Yes But you need command line access to do that (kTerm, USB networking, ...) Since the root of the file system is not exported, only the user area is. *) Not required when do this interactively on the command line. *) Yes, sort of. The only way to completely shut down a Kindle is to remove the battery. There is always some hardware running, for example, what else would read power button presses when the main processor is sleeping? |
04-06-2019, 09:18 PM | #5 |
hopeless n00b
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Join Date: Jan 2009
Location: in the middle of nowhere
Device: PW4, PW3, Libra H2O, iPad 10.5, iPad 11, iPad 12.9
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Ah, sorry I wasn't clear enough.
Jailbreak is absolutely required (OP is already jailbroken so I didn't feel the need to mention that in my previous reply). I don't connect to USB. Not really up to doing the research on setting up USB networking in Windows 7. I found a KUAL add-on on this forum that powers down the kindle. That code above was the contents of the shell script that does the shutdown. I just go to KUAL and select Power OFF Kindle (which launches the above script). |
04-06-2019, 09:20 PM | #6 | |
Grand Sorcerer
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Join Date: Apr 2011
Device: pb360
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Quote:
Without jailbreak, the only terminal access to a kindle is over the serial port. |
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04-06-2019, 09:27 PM | #7 | |
Grand Sorcerer
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Device: pb360
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Quote:
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04-06-2019, 10:59 PM | #8 |
just an egg
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Join Date: Mar 2015
Device: Kindle, iOS
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Okay, thanks all! This is clearly over my head
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04-07-2019, 12:07 AM | #9 |
Going Viral
Posts: 17,212
Karma: 18210809
Join Date: Feb 2012
Location: Central Texas
Device: No K1, PW2, KV, KOA
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04-07-2019, 01:11 AM | #10 | |
hopeless n00b
Posts: 5,110
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Join Date: Jan 2009
Location: in the middle of nowhere
Device: PW4, PW3, Libra H2O, iPad 10.5, iPad 11, iPad 12.9
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Quote:
I don't tinker with my Kindle enough to make the effort to setup USB networking. KOReader, LibrarianSync and Screensaver all work so I'm a happy camper. Last edited by ilovejedd; 04-07-2019 at 01:16 AM. |
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04-05-2021, 12:44 AM | #11 |
Zealot
Posts: 107
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Join Date: Feb 2015
Location: India
Device: Kindle PW3
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I had powered off my jailbroken KPW3 at 96%. Powered it on about a day later and battery is shown at 100%!
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04-05-2021, 12:25 PM | #12 |
BLAM!
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Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E
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Not out of the ordinary. The gauge lies to you all the time: it's designed to avoid your battery dying a horrible death, not giving you accurate information.
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04-05-2021, 03:15 PM | #13 |
Zealot
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Location: India
Device: Kindle PW3
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That figures. I try to not charge it beyond 80% but in case I forget and it charges to 100% it falls to 94% or so rather quickly. I wish there was a way to limit charge to say 80%.
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04-05-2021, 03:23 PM | #14 |
Grand Sorcerer
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Device: pb360
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And the percent charge shown on the display might be a lie about the lie reported by the gauge, which can be greater than 100% because of the values used in the math. The firmware will display 100% for values above 100%.
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Tags |
poweroff, pw4, shutdown |
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