Koreader running on Kobos (all of them, hopefully!)

[boriar]

Originally Posted by roger64

Hi

Draining the battery

I have no figures to provide but after drawing a comparison for some weeks between Nickel 3.1.8 and Koreader (latest), I am convinced that Koreader drains the battery a lot quicker than Nickel. How much is a lot? I would say conservatively twice quicker.

For both the use was quite the same. I mostly took wifi off.

I am keen to experiment more on this if need be but I do not know how to do it.

One question:

Have you activated the cover book screensaver?

[Ken Maltby]

So if it drains the battery twice as fast and Kobo claims that you get 2 months between charges, using it for 30min/day, running Nickel. Then you would have to charge it once a month, if running KOReader. I could live with that. I read a lot and charge my Aura HD about once a week. It is easy to always have it ready to read. Compared with my Tablet that almost always needs to be charged if I plan to make any use of it, and then it can only be used for a few hours before it needs charging.

I also picked up a Samsung 2.0A "Travel Adapter" that came with a 5 foot charging/data USB cord. This makes it easy to charge while reading, if I should let it get lower than I like. KOReader now has a "+" added to the charge percentage displayed, when it is charging, so I can tell that it is charging.

Having to charge once a week, perhaps while reading, is no hardship and being able to go two weeks between charges, instead of just one week, would not be worth much to me. (Certainly nor enough to put up with Nickel.)

Luck;
Ken

[kwokhin]

Originally Posted by Ken Maltby

So if it drains the battery twice as fast and Kobo claims that you get 2 months between charges, using it for 30min/day, running Nickel. Then you would have to charge it once a month, if running KOReader. I could live with that. I read a lot and charge my Aura HD about once a week. It is easy to always have it ready to read. Compared with my Tablet that almost always needs to be charged if I plan to make any use of it, and then it can only be used for a few hours before it needs charging.

I also picked up a Samsung 2.0A "Travel Adapter" that came with a 5 foot charging/data USB cord. This makes it easy to charge while reading, if I should let it get lower than I like. KOReader now has a "+" added to the charge percentage displayed, when it is charging, so I can tell that it is charging.

Having to charge once a week, perhaps while reading, is no hardship and being able to go two weeks between charges, instead of just one week, would not be worth much to me. (Certainly nor enough to put up with Nickel.)

Luck;
Ken

Dear Ken, I know this maybe inappropriate but I think you're very familiar with everything about Kobo that you might be able to help me.thank you in advance!!!
https://www.mobileread.com/forums/sho...d.php?t=268071

[WolfBack]

One thing I miss from Nikel is the fonts sharpeness.
Is there a trick or script to increse the contrast on Koreader beyond the "darker" option? So sad, there's is a "darkest" option that suits me but is only for pdfs.

[Ken Maltby]

Originally Posted by kwokhin

Dear Ken, I know this maybe inappropriate but I think you're very familiar with everything about Kobo that you might be able to help me.thank you in advance!!!
https://www.mobileread.com/forums/sho...d.php?t=268071

Sorry, but I don't even read anything with the stock software, much less make any notes there. Notetaking is a feature often called for at the KOReader project Github pages, but its not there yet. There is an "Evernote" plugin that works to send your highlights to the cloud. There is also a utility to extract highlights from a book, in the KOReader history, to your PC.

Luck;
Ken

[Ken Maltby]

Originally Posted by WolfBack

One thing I miss from Nikel is the fonts sharpeness.
Is there a trick or script to increse the contrast on Koreader beyond the "darker" option? So sad, there's is a "darkest" option that suits me but is only for pdfs.

Have you tried the Advanced settings? I find it easier to edit "defaults.lua" in Notepad++ where there are helpful comments (in green) about the settings.

You can change the values used for "Lighter" "Default" and "Darker" to match your preference.

Luck;
Ken

[Alan_S]

Originally Posted by Ken Maltby

Having to charge once a week, perhaps while reading, is no hardship and being able to go two weeks between charges, instead of just one week, would not be worth much to me. (Certainly nor enough to put up with Nickel.)

Well, certainly I don't like nickel also, but also is true that for some reason koreader when suspended has higher battery drainage that nickel.

That's the reason why I now power off reader if I won't read book for a longer time (in hours).

Some people suggest using suspend script (suspend.sh) from CoolReader that apparently has same battery impact as nickel's script. I didn't tried that though.

But, just to place here, this is suspend script from CoolReader (actually, from whole Vlasovsoft package):

#!/bin/sh

export PATH=$PATH:/sbin:/usr/sbin

echo "suspend.sh: enter"

handler()
{
    kill -15 $pid
    echo 0 > /sys/power/state-extended
    echo "suspend.sh: killed"
    exit 1
}

trap handler SIGTERM

sleep 10 &
pid=$!
wait $pid

# disable wifi
if lsmod | grep -q sdio_wifi_pwr ; then
    wlarm_le -i eth0 down
    ifconfig eth0 down
    /sbin/rmmod -r dhd
    /sbin/rmmod -r sdio_wifi_pwr
fi

echo 1 > /sys/power/state-extended
echo "suspend.sh: delay 2s (dragon)"
sleep 2 &
pid=$!
wait $pid

echo "sleeping... zzz-zzz-zzz-zzz :)"
sync
echo mem > /sys/power/state
echo 0 > /sys/power/state-extended

echo "suspend.sh: normal exit"

And this is suspend script from koreader:

#!/bin/sh
export PATH="${PATH}:/sbin:/usr/sbin"

# Disable wifi
if lsmod | grep -q sdio_wifi_pwr ; then
	wlarm_le -i eth0 down
	ifconfig eth0 down
	rmmod -r dhd
	rmmod -r sdio_wifi_pwr
fi

# Go to sleep
sync
echo 1 > /sys/power/state-extended
sleep 2	# Because reasons?
echo mem > /sys/power/state

[NiLuJe]

@WolfBack: Depending on the quality of the font you're using, switching CRe to use native hinting instead of freetype's autohinter might help (i.e., set font.hinting.mode to 1 in koreader/data/cr3.ini).

@Alan_S: I merged some minor tweaks to the suspend script a few weeks ago, hopefully things have improved?

[roger64]

Originally Posted by boriar

One question:

Have you activated the cover book screensaver?

Yes with proportional image size.

[kwokhin]

Originally Posted by Ken Maltby

Sorry, but I don't even read anything with the stock software, much less make any notes there. Notetaking is a feature often called for at the KOReader project Github pages, but its not there yet. There is an "Evernote" plugin that works to send your highlights to the cloud. There is also a utility to extract highlights from a book, in the KOReader history, to your PC.

Luck;
Ken

Thank you Ken Someone helped me and it's solved.
I only read PDFs on Koreader because it drains too much battery.
Again, thank you for your reply!

[boriar]

Originally Posted by roger64

Yes with proportional image size.

I usually used it but I read somewhere that it may be the reason for the drain battery. Then I give it a try and... YES , now my battery down as normal with nickel. Before, with cover activated, all gone well only a bit faster until someday (randomly) that almost all my battery off. I don't know why but work for me.

[church mouse]

Some people suggest using suspend script (suspend.sh) from CoolReader that apparently has same battery impact as nickel's script. I didn't tried that though.

I have tried that amend, but it didn't seem to make any difference.

Nickel or Coolreader will give me 3 weeks between charging, Koreader gives me no more than 5 days because of large, inconsistent power drains during sleeping - on both my Glo and H2O (both now on KSM8). Using a Sleepcover makes it worse - I have seen the unit light switching on and off whilst I am carrying it with the cover closed. Coolreader has a setting which seems to honour disabling the Sleepcover.

I remain hopeful that someone will post a reliable fix but, in the meantime, I read my Epubs on Coolreader and am liking the personalisation of tap and swipe gestures.

[Frenzie]

Originally Posted by Alan_S

But, just to place here, this is suspend script from CoolReader (actually, from whole Vlasovsoft package):

Note that e.g. the sleep 10 is present in KOReader, but on the Lua-side of things.

It's a workaround in that I couldn't figure out why my H2O wasn't suspending properly, but with a wait of about 7 seconds I always got a reliable suspend.* Those extra 3 seconds are basically just a safety measure.

Perhaps the proportional image screensaver takes a longer time to compute so that the 10-second timeout is insufficient as a workaround?

* I mean a real suspend; that's unrelated to whatever the screen might show.

[boriar]

Originally Posted by boriar

I usually used it but I read somewhere that it may be the reason for the drain battery. Then I give it a try and... YES , now my battery down as normal with nickel. Before, with cover activated, all gone well only a bit faster until someday (randomly) that almost all my battery off. I don't know why but work for me.

Originally Posted by Frenzie

Note that e.g. the sleep 10 is present in KOReader, but on the Lua-side of things.

It's a workaround in that I couldn't figure out why my H2O wasn't suspending properly, but with a wait of about 7 seconds I always got a reliable suspend.* Those extra 3 seconds are basically just a safety measure.

Perhaps the proportional image screensaver takes a longer time to compute so that the 10-second timeout is insufficient as a workaround?

* I mean a real suspend; that's unrelated to whatever the screen might show.

That may be the point because without cover screensaver I can get proper sleep. I don't know about the second business. May be changing this 10 second to a higher number solve the problem?

[Alan_S]

Originally Posted by NiLuJe

@Alan_S: I merged some minor tweaks to the suspend script a few weeks ago, hopefully things have improved?

From which version? Now I'm on 2015-11-3 stable, but I saw that there are newer versions?

Also, this is a bit tricky to found out when battery drains faster. To me it looks like it just drains two times faster when I suspend then when I shut it off, but this may be just coincidence.

Originally Posted by boriar

I usually used it but I read somewhere that it may be the reason for the drain battery. Then I give it a try and... YES , now my battery down as normal with nickel.

Strange, I always turn off book cover and still see higher battery drain when in standby compared with battery drain when turned off.

Originally Posted by church mouse

Nickel or Coolreader will give me 3 weeks between charging, Koreader gives me no more than 5 days because of large

For me was over month when I turned it off and about 2 weeks when suspending.

I have cover with magnets, so they may affect battery drain in strange ways. Maybe it would be good to have option to turn off sleep by cover with magnets?

Originally Posted by Frenzie

It's a workaround in that I couldn't figure out why my H2O wasn't suspending properly, but with a wait of about 7 seconds I always got a reliable suspend.* Those extra 3 seconds are basically just a safety measure.

I'm not sure, but to me looks like battery is still drained in suspend. And sometimes it looks like device is still on, even it looks suspended.

But, can't tell for sure what really goes on.

When I turn it off, I see increase in time between charges. This is valid for older version, not for the latest changes in suspend script.