Kobo Bug thread

[JSWolf]

Originally Posted by Aleron Ives

Have you run the bug check in the Calibre editor? The book is probably malformed in some way, and you'll have to edit it to stop the crashing.

If you didn't experience this problem on older firmware, you could also try downgrading, but probably one or more books is to blame (aside from Kobo's poor error handling).

eBooks should not have any technical errors.

[DNSB]

Originally Posted by JSWolf

eBooks should not have any technical errors.

Jon, I'm going to have to bill you for a new keyboard since I sprayed coffee over my keyboard when I read that statement.

[PeterT]

It wou/ld be worthwhile knowing as much as we can about these books.

Are they originallty kepubs from the Kobo store or converted ePubs?

Whats is the provenance of these books?

image handling is one large difference between the two engines on the Kobo. With keoyb's one an click on an image to zoom it; this action is not supported on the ePub engine,

[gsgleason]

Originally Posted by PeterT

It wou/ld be worthwhile knowing as much as we can about these books.

Are they originallty kepubs from the Kobo store or converted ePubs?

Whats is the provenance of these books?

image handling is one large difference between the two engines on the Kobo. With keoyb's one an click on an image to zoom it; this action is not supported on the ePub engine,

They're library epub books downloaded via Adobe Digital Editions and fixed to allow sideloading.

[DNSB]

Oddly, if you have your Adobe ID setup on your Kobo, you can sideload directly from ADE though that will deliver an epub format ebook.

If the library you are using uses Overdrive, you can set up your Kobo with Overdrive so your loans will automatically be synced to your Kobo from Kobo's store which will deliver a kepub format ebook.

If by "fixed", you mean you have removed the DRM which also removes the return date, that is pretty much ebook piracy, IMNSHO.

[dhpitt]

I've sideloaded many books from my mac onto my Kobo Clara BW in the past. I don't know what happened today; maybe firmware update or something. but now, when I connect the kobo to my Mac, I'm unable to eject it after moving epub files onto the drive. Force ejecting works, but no books appear on the device. I've already factory reset and manually reset the device tonight but neither has solved this problem.

[DNSB]

Have you checked that Spotlight or another program is not trying to index the files on your Kobo?

[dhpitt]

I updated my mac to macOS 15.1 and this issue disappeared. However, I'm still unable to import new books to my e-reader. I've tried both moving the epubs manually to the KOBOeReader drive, and using Calibre to "send to device". I then eject the e-reader, and the e-reader's screen shows a message saying that it's importing new content. But to no avail. Books don't show up. Has anyone encountered this?

[DNSB]

Where on your Kobo ereader's exposed storage are you placing the books? When you reconnect your Kobo to your Mac, are you able to browse the exposed storage and see the ebooks? Placing them in the root of the exposed storage is not recommended since the number of directory entries is limited. Create a directory (I use eBooks) to store them. In the KoboTouch or KoboTouchExtended driver, I use the following save template :

eBooks/{author_sort:sublist(0,1,&)}/{title} - {authors:sublist(0,1,&)}

So basically, store the books in eBooks in a directory created from the first author sort value for the book with the filename created from the title and the first author name. i.e. eBooks/Flint, Eric/Mother of Demons - Eric Flint.epub

Limiting to the first author sort/author is simply to keep the file paths and names shorter.

Another item to try is to remove the two calibre files in the root of the exposed storage (driveinfo.calibre & metadata.calibre), safely ejecting, reconnecting and seeing if calibre recreates them when you connect.

Does Kobo Utilities report your database as being ok? Kobo Utilites => Database => Check the device database.

[JSWolf]

Originally Posted by dhpitt

I updated my mac to macOS 15.1 and this issue disappeared. However, I'm still unable to import new books to my e-reader. I've tried both moving the epubs manually to the KOBOeReader drive, and using Calibre to "send to device". I then eject the e-reader, and the e-reader's screen shows a message saying that it's importing new content. But to no avail. Books don't show up. Has anyone encountered this?

Install the Kobo Utilities plugin and when you run calibe, plug in your Kobo and use KU to check that the database is not corrupt.

[shinjilestat]

New on Kobo Libra color, i'm running into a rather odd issue with the image dithering.

In fact, on some mangas from the Kobo French store, such as l'Atelier des Sorciers Tome 01 or Vigilante My Hero Academia Tome 01 both in French, there is no dithering.

This problem also appears on my friend's Kobo Libra Color, but don't on my Clara HD with the same files.

On further investigation, I discovered that this issue only occurs on kepub or epub files, but not on other file types such as pdf or jpg.

It seems to be a software issue.
Do others have the same problem ?

I tried this e-mail address to report this issue "help@kobo.com", but got no reply.

I don't know how to link images here, so I'll link to my post on the ereader subreddit :
https://www.reddit.com/r/ereader/com...on_kobo_libra/

[compurandom]

Originally Posted by shinjilestat

New on Kobo Libra color, i'm running into a rather odd issue with the image dithering.

I see slight banding on a gradient background.

Does it look different if you change the rainbow effect setting?

more -> settings -> reading settings -> (p2) Reduce rainbow effect

[shinjilestat]

Yes, this banding is caused by the lack of dithering.

The Rainbow effect setting was on OFF.
Put in on ON, there is no change at all .

[compurandom]

Originally Posted by shinjilestat

The Rainbow effect setting was on OFF.
Put in on ON, there is no change at all .

Ya, I couldn't see a difference when I changed it either. Can't figure out what that setting actually does. I keep hoping there's a problem it actually fixes.