[Xquartz-dev] Class unable to view Qt5 Linux app using XQuartz

from at alumni.stanford.edu from at alumni.stanford.edu
Thu May 5 14:41:49 PDT 2016


Thank you for your reply. I thought I sent a reply to the list but
apparently not.

We were able to discover the cause of the problem and a fix.

The default XQuartz Pasteboard preference was:

Update Pasteboard when CLIPBOARD changes: checked

If this box is unchecked, cutting and pasting works.

This did lead to different problem, however, about the key mappings for
cutting and pasting, which I posted in a followup post, which I'll repeat

---------- Begin forwarded message ----------

Dear XQuartz developers,

I have a class where the majority of students are using Macs and XQuartz to
interact with an app running on Linux. They are developing code with the
app, so are doing a lot of copying and pasting.

The students are used to using Cmd-C and Cmd-V to copy and paste, but the
app expects Ctrl-C and Ctrl-V.

Googling how to map the keys led to your website, where I tried the
solution offered at


which is to have the students use this .Xmodmap file

clear mod2
clear control
keycode 63 = Control_L
keycode 67 = Control_L
keycode 71 = Control_L
add control = Control_L

Unfortunately, this doesn't work.

I'm sure this is a commonly desired functionality and there must be a
solution. Could you please tell me how to accomplish this key mapping.

These are our XQuartz Pasteboard settings:
Enable syncing: y
Update Pasteboard when CLIPBOARD changes: n
Update CLIPBOARD when Pasteboard changes: y
Update PRIMARY (middle-click) when Pasteboard changes: y
Update Pasteboard immediately when new text is selected: n

Many thanks,


*From: *Ken Thomases <ken at codeweavers.com>
*Subject: **Re: [Xquartz-dev] Class unable to view Qt5 Linux app using
*Date: *April 12, 2016 at 8:13:30 PM PDT
*To: *Developer talk about Xquartz <xquartz-dev at lists.macosforge.org>
*Reply-To: *Developer talk about Xquartz <xquartz-dev at lists.macosforge.org>

What X error is Qt getting?  Presumably, you'd need the Qt developers' help
in learning that.  Maybe Qt has a verbose logging setting.  Which selection
is it using?

They asked about the ssh X11 forwarding configuration.  That would be
useful for us, too.

Did you try installing xsel on the Linux system and running it with a Mac
as the X server?  What were the results?

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