Flaky barely usable install on Fedora Linux (Qt, Wayland, X11)

vepxistqaosani · 02-26-2022, 07:55 PM

I’m running Fedora 35 (5.16.11-200.fc35.x86_64) with Gnome 41.3 on an AMD CPU 1950x, with two Nvidia cards and > 100GB RAM.

For about six weeks, I’ve been unable to use Calibre.

The problem was that (somehow) Qt thought my system was using Wayland when it was actually using X11. So Calibre didn’t launch at all; the debug just gave misleading messages. Once I managed to install Wayland (tricky, because of Nvidia issues), I got my library back.

Alas, I can’t do much with it: The two parts I use most (ebook-viewer and ebook-edit) produce unreadably mangled windows, even though the main library window looks just fine.

I had exactly the same problem with the Chrome browser (though not Firefox), which I could fix by passing it a couple of command-line arguments (--enable-features=UseOzonePlatform --ozone-platform=wayland).

Is there a similar workaround for the satellite apps? Is there any difference in the way the main window, on the one hand, and the viewer and editor, on the other, interact with Qt, the OS, and/or the windowing system?

I doubt this has anything to do with the desktop environment, but I suppose I could switch from Gnome to KDE and see if that helps … Any thoughts?

Thanks!
Fred

theducks · 02-26-2022, 08:03 PM

What version of Calibre? (Hint:The repository versions are usually far behind on many distros). Use the Commandline installer on the Linux download page

vepxistqaosani · 02-26-2022, 09:00 PM

Thanks for the reply.

Yes, I update whenever I get a push. I'm currently at 5.37.

kovidgoyal · 02-26-2022, 09:26 PM

the viewer and editor use qt webengine, which is based on chromium. If you want to pass flags to it, use https://doc.qt.io/qt-5/qtwebengine-debugging.html

vepxistqaosani · 02-26-2022, 09:46 PM

Thanks! That looks like a great clue.

I guess I’ll have to learn a bit of Qt development. But learning is good for the soul!

02-26-2022, 07:55 PM	#1
vepxistqaosani Junior Member Posts: 4 Karma: 10 Join Date: Jun 2021 Device: Fire HD 10	Flaky barely usable install on Fedora Linux (Qt, Wayland, X11) I’m running Fedora 35 (5.16.11-200.fc35.x86_64) with Gnome 41.3 on an AMD CPU 1950x, with two Nvidia cards and > 100GB RAM. For about six weeks, I’ve been unable to use Calibre. The problem was that (somehow) Qt thought my system was using Wayland when it was actually using X11. So Calibre didn’t launch at all; the debug just gave misleading messages. Once I managed to install Wayland (tricky, because of Nvidia issues), I got my library back. Alas, I can’t do much with it: The two parts I use most (ebook-viewer and ebook-edit) produce unreadably mangled windows, even though the main library window looks just fine. I had exactly the same problem with the Chrome browser (though not Firefox), which I could fix by passing it a couple of command-line arguments (--enable-features=UseOzonePlatform --ozone-platform=wayland). Is there a similar workaround for the satellite apps? Is there any difference in the way the main window, on the one hand, and the viewer and editor, on the other, interact with Qt, the OS, and/or the windowing system? I doubt this has anything to do with the desktop environment, but I suppose I could switch from Gnome to KDE and see if that helps … Any thoughts? Thanks! Fred

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02-26-2022, 08:03 PM	#2
theducks Well trained by Cats Posts: 31,001 Karma: 60358908 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A	What version of Calibre? (Hint:The repository versions are usually far behind on many distros). Use the Commandline installer on the Linux download page

02-26-2022, 09:00 PM	#3
vepxistqaosani Junior Member Posts: 4 Karma: 10 Join Date: Jun 2021 Device: Fire HD 10	Thanks for the reply. Yes, I update whenever I get a push. I'm currently at 5.37.

02-26-2022, 09:26 PM	#4
kovidgoyal creator of calibre Posts: 45,299 Karma: 27111240 Join Date: Oct 2006 Location: Mumbai, India Device: Various	the viewer and editor use qt webengine, which is based on chromium. If you want to pass flags to it, use https://doc.qt.io/qt-5/qtwebengine-debugging.html

02-26-2022, 09:46 PM	#5
vepxistqaosani Junior Member Posts: 4 Karma: 10 Join Date: Jun 2021 Device: Fire HD 10	Thanks! That looks like a great clue. I guess I’ll have to learn a bit of Qt development. But learning is good for the soul!

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