Power-off timeout

Hamsky · 02-25-2019, 02:17 AM

Hi, All,

in KOReader we have sleep timeout, but how to set up power-off timeout?

For example if sleep more than 4 hours - switch book off, so will not drain battery.

Is there any option to do so?

Frenzie · 02-25-2019, 11:23 AM

I suppose it might be theoretically possible with rtcwake.[1] But it seems like a pretty bad trade-off to me. The battery drains so slowly in sleep that it'll last for months, which is rather the point, whereas booting takes a while.

PRs welcome, of course.

[1] If the Kobo actually supports it.

Frenzie · 02-26-2019, 05:57 AM

This piqued my curiosity. The answer would seem to be that it's not supported. On a normal device, you can do this to suspend to memory and wake up in 10 seconds:

Code:

sudo rtcwake -m mem -s 10

On a Kobo, you get this:

Code:

# rtcwake -m mem -s 10
rtcwake: /dev/rtc0 not enabled for wakeup events

NiLuJe · 02-26-2019, 10:52 AM

There may be a quirk to get them working, looking at the rcS init script might help, as I vaguely recall something of the sort there at one point (i.e., disabling rtc wakes).

Frenzie · 02-26-2019, 01:25 PM

Huh, there's indeed some kind of reference to it on line 213 of mine:

Code:

(
/usr/local/Kobo/pickel disable.rtc.alarm

if [ ! -e /etc/wpa_supplicant/wpa_supplicant.conf ]; then
  cp /etc/wpa_supplicant/wpa_supplicant.conf.template /etc/wpa_supplicant/wpa_supplicant.conf
fi

echo 1 > /sys/devices/platform/mxc_dvfs_core.0/enable

/sbin/hwclock -s -u
) &

Anyway, I'm not super interested. :P

Edit: looks it worked on the old Kobo Touch?

https://www.mobileread.com/forums/sh...=182891&page=2

But my kernel apparently doesn't have that "file".

It wouldn't surprise me if it worked on the https://github.com/lgeek/okreader kernel though.

pazos · 02-26-2019, 02:31 PM

Yes, the rtc-wake trick did work on old firmware (pre hardfloat) and required, at least in my case, a custom busybox build.

02-25-2019, 02:17 AM	#1
Hamsky Enthusiast Posts: 34 Karma: 10 Join Date: Feb 2019 Device: Kobo Aura, Kobo H2O	Power-off timeout Hi, All, in KOReader we have sleep timeout, but how to set up power-off timeout? For example if sleep more than 4 hours - switch book off, so will not drain battery. Is there any option to do so?

02-26-2019, 05:57 AM	#3
Frenzie Wizard Posts: 1,619 Karma: 724945 Join Date: Oct 2014 Location: Antwerp Device: Kobo Aura H2O	This piqued my curiosity. The answer would seem to be that it's not supported. On a normal device, you can do this to suspend to memory and wake up in 10 seconds: Code: sudo rtcwake -m mem -s 10 On a Kobo, you get this: Code: # rtcwake -m mem -s 10 rtcwake: /dev/rtc0 not enabled for wakeup events

02-26-2019, 01:25 PM	#5
Frenzie Wizard Posts: 1,619 Karma: 724945 Join Date: Oct 2014 Location: Antwerp Device: Kobo Aura H2O	Huh, there's indeed some kind of reference to it on line 213 of mine: Code: ( /usr/local/Kobo/pickel disable.rtc.alarm if [ ! -e /etc/wpa_supplicant/wpa_supplicant.conf ]; then cp /etc/wpa_supplicant/wpa_supplicant.conf.template /etc/wpa_supplicant/wpa_supplicant.conf fi echo 1 > /sys/devices/platform/mxc_dvfs_core.0/enable /sbin/hwclock -s -u ) & Anyway, I'm not super interested. :P Edit: looks it worked on the old Kobo Touch? https://www.mobileread.com/forums/sh...=182891&page=2 But my kernel apparently doesn't have that "file". It wouldn't surprise me if it worked on the https://github.com/lgeek/okreader kernel though. Last edited by Frenzie; 02-26-2019 at 01:32 PM.

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02-25-2019, 11:23 AM	#2
Frenzie Wizard Posts: 1,619 Karma: 724945 Join Date: Oct 2014 Location: Antwerp Device: Kobo Aura H2O	I suppose it might be theoretically possible with rtcwake.[1] But it seems like a pretty bad trade-off to me. The battery drains so slowly in sleep that it'll last for months, which is rather the point, whereas booting takes a while. PRs welcome, of course. [1] If the Kobo actually supports it.

02-26-2019, 10:52 AM	#4
NiLuJe BLAM! Posts: 13,478 Karma: 26012494 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	There may be a quirk to get them working, looking at the rcS init script might help, as I vaguely recall something of the sort there at one point (i.e., disabling rtc wakes).

02-26-2019, 02:31 PM	#6
pazos cosiñeiro Posts: 1,271 Karma: 2200049 Join Date: Apr 2014 Device: BQ Cervantes 4	Yes, the rtc-wake trick did work on old firmware (pre hardfloat) and required, at least in my case, a custom busybox build.

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