On Wed, Mar 17, 2021 at 04:11:56PM -0300, David Pirotte wrote: > > QT_QPA_PLATFORMTHEME=qt5ct linphone > > That does not solve the problem, fwiw. > > > GDK_BACKEND=x11 linphone > > That solves the problem.
Ideally Qt would detect that the platform theme needs that backend and perform the configuration automatically, but apparently that is not yet implemented. I cleaned your output up a bit and diffed it with "diff -U0 debian.env appimage.env" which gives: --- debian.env 2021-03-17 20:34:13.187385487 +0100 +++ appimage.env 2021-03-17 20:41:24.519376882 +0100 @@ -1,0 +2,3 @@ +APPDIR=/tmp/.mount_LinphoATI0bC +APPIMAGE=/opt/linphone/bin/Linphone-4.2.5.AppImage +ARGV0=./Linphone-4.2.5.AppImage @@ -8 +10,0 @@ -GDK_BACKEND=x11 @@ -31,0 +34 @@ +OWD=/opt/linphone/bin @@ -38,2 +40,0 @@ -PS1=\u@\h:\w \# $ -PS2=> @@ -42,0 +44 @@ +QT_QPA_PLATFORMTHEME=gtk2 @@ -45 +47 @@ -SHLVL=1 +SHLVL=2 @@ -53 +54,0 @@ -_=/usr/bin/linphone This tells us that the appimage uses the GTK2 platform theme. You could install the package qt5-gtk2-platformtheme and invoke linphone like so: GDK_BACKEND=x11 QT_QPA_PLATFORMTHEME=gtk2 linphone Then it should look and behave almost identical to the appimage variant. > Although, fwiw, (a) the window 'shape is different (the AppImage has > square corners - the debian window rounded corners, and (b) the font > family and font size are diff as well (musch smaller for the debian > version... no problem at all, big deal, just mentioning ... Any other differences will probably be due to missing fonts which you'd have to install/copy over from the appimage, though I can't find any font files on the appimage. If you find a way to make it look like the appimage, tell us how, so we can maybe tune the defaults. Regards, Dennis