Comment 2 for bug 1834305

I have the same problem with my Kindle Paperwhite. I can mount it fine, write to it via Nautilus and connect to a folder on it via Calibre.

When I try to send a book over via Send to device -> Send specific format to -> Main Memory and choose mobi, the conversion happens and the book gets transferred (i.e. not corrupt, Kindle can read it) but the device is immediately disconnected afterwards.

I get the following dmesg output on that operation:

[ 2009.032468] VFS: busy inodes on changed media or resized disk sda
[ 2009.040166] sd 2:0:0:0: [sda] tag#0 access beyond end of device
[ 2009.040170] print_req_error: I/O error, dev sda, sector 1 flags 1
[ 2009.040172] Buffer I/O error on dev sda, logical block 1, lost async page write
[ 2009.040201] sd 2:0:0:0: [sda] tag#0 access beyond end of device
[ 2009.040204] print_req_error: I/O error, dev sda, sector 0 flags 801
[ 2009.040206] Buffer I/O error on dev sda, logical block 0, lost sync page write

If I convert the book (epub -> mobi) locally and copy it over from my Calibre folder to Kindle at the same location (documents) via Nautilus I get no such error and the device stays mounted.