Kindle -- KOReader: a document reader for PDF, DJVU, EPUB, FB2, HTML, ... (GPLv3)

[pazos]

The backlight of an lcd device and the leds around an eink device are the same from the PoV of the OS.

For instance, on my linux laptop "brightnessctl" returns

Device 'intel_backlight' of class 'backlight':
	Current brightness: 100 (53%)
	Max brightness: 187

and I can set the desired brightness from 0 (off) to the max brightness specified above.

In the same vein, on a eink device with frontlight leds I can set the brightness from the minimum to the maximum.

In both cases which determines the minimum and the maximum are device drivers. In this case I can retrieve the info that's exported in sysfs with "udevadm info --attribute-walk --path=/sys/class/backlight/intel_backlight"

the result, as you can see, returns the same:

...
looking at device '/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight':
    KERNEL=="intel_backlight"
    SUBSYSTEM=="backlight"
    DRIVER==""
    ATTR{actual_brightness}=="100"
    ATTR{bl_power}=="0"
    ATTR{brightness}=="100"
    ATTR{max_brightness}=="187"
    ATTR{power/control}=="auto"
    ATTR{power/runtime_active_time}=="0"
    ATTR{power/runtime_status}=="unsupported"
    ATTR{power/runtime_suspended_time}=="0"
    ATTR{scale}=="unknown"
    ATTR{type}=="raw"
...

So, to sum up:

Kernel drivers provide our (and stock) source of truth.

It could be possible to tweak specific kernel drivers to provide more granularity in case the minimum/maximum exposed by the driver don't match the (safe) minimum/maximum the hardware is capable. The same happens with the steps between n and n+/-1 brightness.

Nobody sensible enough is going to play with this on a embedded device like the Kindle.

[kos25k]

Originally Posted by mergen3107

On most isb controller data is not active if there is no power, so the only battery-friendly option is to have ssh.

I think your option is the best.But i think i have to block system to update so to not lose jailbreak.Is there any proper way to do this?

[mergen3107]

look for renameotabin extension here. Another option is to fill up the disk space until less than 200 mb is left (e. g., with manga ).

One very dramatic way, which I can’t test since I don’t own a Kindle anymore, but I think will work, is to mess with ca-certificates to remove the Amazon-only certificates.

[kos25k]

Guys can someone help me?Which is the ideal format to read pdf's?I noticed that when format is pdf,some settings that regard view are missing,so i can't adjust the pdf to fill ok to the screen.Maybe epub or mobi?(i want as much as possible document settings)

[mgrimace]

Hello, looking for advice -
Setup: I have a KO2, jailbroken with Koreader. I have both Calibre and Calibre-web self-hosted.

Question: What’s the ‘best’ way to browse/send/manage books from my library to my Kindle, and organize them once they’re there.
- By ‘best’ I mean browsing my content, ideally with covers, and copying them wirelessly from my library to the device. Calibre-web OPDS, calibre server, calibre koreader plugin… there’s options.
- And in terms of downloading, how do folks organize the files/folders on the device. For example, I can see the in-built Kindle authors/titles on my main Koreader screen, which appear as ‘empty’ because they’re awz3/kfx…do folks put the books there? A single Koreader folder? Etc.

Thank you in advance for your setups, advice. It’s my first time using Koreader and I don’t have a good sense of the workflow on a kindle.

[kos25k]

Hello to all.I own a kindle 2019 kinds edition with koreader and i wonder if there are some pdf settings through koreader or calibre,with which i will be able to read pdf's at a logically good quality.Thank you.

Στάλθηκε από το M2102J20SG μου χρησιμοποιώντας Tapatalk

[Rauliki]

How do I install KOreader again? It doesnt work on my PW4 with KUAL. I downloaded latest release, copied everything to root folder (2 folders) and tried to update from KUAL. There is 'Try to install KOreader from scratch...' and it goes forever. And Koreader doesn't start.

[Ana1970]

Originally Posted by Rauliki

How do I install KOreader again? It doesnt work on my PW4 with KUAL. I downloaded latest release, copied everything to root folder (2 folders) and tried to update from KUAL. There is 'Try to install KOreader from scratch...' and it goes forever. And Koreader doesn't start.

Hi, this latest version worked for me on pw4
koreader-kindlehf-v2024.11-169-g08b9fd9aa_2025-01-28.zip

[stanislav2000]

Hello.
I need help. I installed koreader-kindle-legacy version on my Kindle 3 Keaboard. Everything works, but Kindle's side buttons for page turning aren't in best condition. I'd like to ask if there is a possibility to set up some of the keyboard buttons for page turning, e.g. A for back, K for forward. I haven't found no such option in the KOReader Мenu.

Thank you.

P.S. I have CoolReader3 installed on the same Kindle - there is such option by simply editing the keymap.ini file.

[hius07]

Originally Posted by stanislav2000

Hello.
I need help. I installed koreader-kindle-legacy version on my Kindle 3 Keaboard. Everything works, but Kindle's side buttons for page turning aren't in best condition. I'd like to ask if there is a possibility to set up some of the keyboard buttons for page turning, e.g. A for back, K for forward. I haven't found no such option in the KOReader Мenu.

Maybe "Hotkeys" plugin can help.

[kos25k]

Hello guys.Is there any setting on koreader to also automatically turn off wifi when sync progress is finished? (Turn on wifi when pressing sync works ok though).

[C2000]

I'm on Kindlehf version 202411000209 (PW6SE) and every time I try to update OTA (development channel selected) I get the "Failed to update KOReader" pop-up. Anybody know a reason why or a fix?

[pumpkinwhite]

Does anyone know if there are plans for KOReader to support the new double-tap feature on the Colorsoft and Paperwhite signature edition?

[mergen3107]

No plans, but patches welcome

[belle39234]

hey quick question: can koreader utilise custom columns from calibre?