Bug 1767265

This problem makes Lyx virtually unusable.

By the way, I even rebooted and open Lyx again to test whether the problem would go away.  It didn't.  There is a bug with the application or in a library upon which Lyx depends -- maybe a QT issue, or with the QT code that interfaces with GDK.

Also, when I click on the Style/Class menu, the drop down list doesn't appear.

The problems with Lyx appear to be related to Wayland.  When I run Lyx within an Xorg session, it works fine, although I had no problems when running Lyx under Wayland in Fedora 30, although I don't recall whether Lyx was running as an XWayland client or straight Wayland client.  In Fedora 31, Lyx appears to be a straight Wayland client.

I guess that I should qualify my last statement.  Under Wayland, Lyx appears to run as a straight Wayland client, but it has issues when it does so.  When I run Lyx under an Xorg session, it runs fine.

There is a corresponding bug on the Lyx Project bug tracking site.  See ...

https://www.lyx.org/trac/changeset/aaf96b30/lyxgit

There appears to be a patch to fix the problem.

Hello !
I have exactly the same problem. Any fix on Fedora repo?
Thx

I have the same problem on Fedora 31.

Also, on a dual monitor system, sometimes Lyx drop-down menus behave in a weird way.  On my primary monitor, they appear shifted down with a gap between the menu item and the menu list.  Also, if I move the Lyx to my secondary monitor and click a drop-down menu item, the menu doesn't appear.

I also found a simple workaround using ssh.  Just login to your current account using ssh and then run lyx from the command line in the background, or foreground if you wish -- for example,


ssh -X localhost
lyx &

On my box, although lyx runs with a light theme instead of my preferred Dark Theme, the menus appear intact and when I edit documents, there's no flashing or anything odd while editing a document.

A cleaner workaround is to create a bin directory,

-----------------------------------
mkdir -p $HOME/bin
cd $HOME/bin
-----------------------------------

and create a script, called lyx, in the $HOME/bin directory whose contents looks like the following:

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#!/bin/bash

ssh -X localhost /usr/bin/lyx &
----------------------------------

and then, make the script executable as in the following:

-----------------------------------
chmod 755 lyx
-----------------------------------

Then, make sure that the directory, $HOME/bin, precedes the directory /usr/bin/ in your environment's PATH variable -- for example,

-----------------------------------------
echo $PATH
/home/bbigby/bin:/usr/share/Modules/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin
-----------------------------------------

Now, when you run lyx from the terminal or click on the lyx icon launcher, the script above will run in X11 mode and operate normally, but with the exception that the Light theme of lyx might not match the theme of your  desktop.

The patches for fixing the issues with lyx are supposed to arrive in lyx 2.3.4, but until then, this is a fairly clean workaround.

However, once 2.3.4 is available on your system, you can either eliminate or rename the script so that the system will find and run the lyx 2.3.4 binary directly or you can keep your script in place and modify it so that it does not invoke the ssh command as in the following:

----------------------------------
#!/bin/bash

/usr/bin/lyx &
----------------------------------

If lyx is working properly, then you can continue with the script or delete it altogether. However, if lyx is not working properly, then you can restore the script to its original state:

----------------------------------
#!/bin/bash

ssh -X localhost /usr/bin/lyx &
----------------------------------

Note: You might have to enter your ssh password during the lyx launch process.

lyx-2.3.4-1.fc31 has been pushed to the Fedora 31 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2020-447afa6b58

lyx-2.3.4-1.fc31 has been pushed to the Fedora 31 stable repository. If problems still persist, please make note of it in this bug report.

This issue is still happening in version 2.3.6.1 on Manjaro Linux. 

The workaround of using SSH with X forwarding to the localhost avoids the problem, but causes other issues with instatiating Okular, etc.