Copyq: High DPI display issue on Ubuntu 18.04 fresh install.

[eera5607]

Describe the bug
At Ubuntu startup (on a PC with a 4K display), incorrect scaling is shown on user interface. Fonts are very small basically. See screenshot below. If I close CopyQ and reopen it with command:

copyq

the user interface shows good scaling. Normal size fonts.

To Reproduce
Steps to reproduce the behavior:

1. Start an Ubuntu PC with CopyQ autostart option enabled.
2. Show user interface (bad scaling, very small fonts)
3. Close CopyQ and reopen.
4. Show user interface (good scaling, normal size fonts)

Expected behavior
I think it would be ideal if CopyQ autostarts with good scaling since the beggining.

Screenshots
At Ubuntu startup:

After closing it and reopening:

Version, OS and Environment

• CopyQ Clipboard Manager v3.2.0
  Built with: Qt 5.9.3, LibQxt 0.7.0
• Ubuntu 18.04.2 fresh install.
• Gnome 3.26.

Additional context
I tried setting a environmental variable at application startup entry:

env QT_AUTO_SCREEN_SCALE_FACTOR=1 copyq

but it did not work.

Thanks!

[hluk]

Yes, I have the same issue in both Gnome and KDE/Plasma.

It's related to #1119. Qt apps don't react on DPI/scaling change on X11.

You can try setting QT_SCALE_FACTOR=2 or QT_SCREEN_SCALE_FACTORS=2 instead.

[eera5607]

Yes. I mean, if I set those variables or not if I restart the app everything looks fine. Bad scaling only occurs at startup. I just have to quit CopyQ and open it again and it is solved. I don't understand why.

[hluk]

I think it's because at start the scaling in the desktop environment (DE) is not yet set correctly but apps are already being auto-started. And after the scaling is updated by the DE, Qt framework won't pick up it up unfortunately.

[eera5607]

Is it possible that a delay in the startup of CopyQ would fix it? Maybe 5 o 10 seconds.

[hluk]

Is it possible that a delay in the startup of CopyQ would fix it? Maybe 5 o 10 seconds.

See: https://github.com/hluk/CopyQ/issues/465#issuecomment-196685151

[eera5607]

Thank you. For some reason, using that type of commands does not work anymore on startup entries on Ubuntu 18.04+.
In this case the solution was to add this line:

X-GNOME-Autostart-Delay=3

at the end of the autostart file ~/.config/autostart/copyq.desktop

That solved the issue. Thanks for the all the help.

[hluk]

X-GNOME-Autostart-Delay=3

Nice, thanks for the tip, I didn't know about this option. Would be good if there is similar option for KDE.

I'm closing this as duplicate of #1119.