Quote:
Originally Posted by jhowell
Calibre contains drivers to handle the specific needs of various e-reader devices. Calibre uses the Kindle driver for most e-ink Kindle devices. However Kindle Scribe devices with the 5.16.3 firmware appear to the OS running calibre as MTP (Media Transfer Protocol) devices, causing them to be accessed using the MTP driver within calibre.
The 6.26 release of calibre has some changes to the MTP driver to ignore some of the extraneous files found in the Scribe that the Kindle driver has always ignored automatically. That makes the Scribe work somewhat better when connected to calibre. But there is still a lot of Kindle-specific handling that will no longer be applied to Scribe devices.
As you found one of the Kindle-specific features that will no longer work for Scribes is providing cover thumbnail images for sideloaded AZW3 files. Others are providing page numbers (APNX files) for sideloaded MOBI and AZW3 files, reading metadata from Amazon purchased books in KFX format, and importing Amazon purchased books in KFX format into calibre from the books-on-Device list.
There are most likely additional side effects of this change that I am not yet aware of.
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It's not clear to me what is impacted and how.
On Scribe I do see a Title for everything, include KFX (it's concocted somehow -has punctuation stripped and ASIN tacked on - so not from metadata). Purchased content also does not match up to Library, whereas personal documents do show expected author/title metadata and match to calibre Library (none of this is side-loaded). For personal document KFX, I see expected Title and Author. I can import purchased KFX as KFX-ZIP file. There are no cover images for anything in on-device list.
On Paperwhite 11th gen (which takes much longer to be detected by calibre), again purchased KFX content doesn't show actual metadata, no match to calibre Library, on-device preview shows no cover images, and the purchased KFX cannot be Added even as KFX-ZIP.
So the only difference is you can FWIW import KFX (to KFX-ZIP) with MTP and cannot using USB Drive.
I side loaded azw3 files to both (transfers faster to Scribe), and for third party content, you no longer get cover thumbnail when transferring with calibre (I always use send to Kindle anyway).
How would I check APNX functionality?