[tinker123]

Originally Posted by kovidgoyal

This will be a compat issue between Qt WebEnginge and your GPU drivers. Try updating your GPU drivers or turning off hardware acceleration for webengine as described in https://doc.qt.io/qt-6/qtwebengine-debugging.html

Are the GPU drivers part of my operating system or part of Calibre?

I tried turning off hardware acceleration, but Calibre didn't recognize the command line options ( I even tried it with a path to a book ).

Mint20.2UmaCinnamon5.0.7> calibre --disable-gpu
Usage: calibre [options] [path_to_ebook or calibre url ...]

Launch the main calibre Graphical User Interface and optionally add the e-book at
path_to_ebook to the database. You can also specify calibre URLs to perform various
different actions, than just adding books. For example:

calibre://view-book/test_library/1842/epub

Will open the book with id 1842 in the EPUB format from the library
"test_library" in the calibre E-book viewer. Library names are the folder names of the
libraries with spaces replaced by underscores. A full description of the
various URL based actions is in the User Manual.


Whenever you pass arguments to calibre that have spaces in them, enclose the arguments in quotation marks. For example: "/some path/with spaces"

calibre: error: no such option: --disable-gpu
Mint20.2UmaCinnamon5.0.7>