QSystemTrayIcon does not show up under VNC session

daria_is

Hi experts, need your help.

The following code works perfectly directly on PC, but under VNC session the tray icon does not show up.
Tried Ubuntu 20.04 and Ubuntu 22.04. Using tigervnc-standalone-server.

  QSystemTrayIcon* m_trayIcon = new QSystemTrayIcon(this);
  m_trayIcon->setIcon(QIcon(":/images/trayicon.svg"));
  m_trayIcon->setToolTip(tr("SSM"));
  m_trayIcon->show();

Any suggestions are very valuable. Thanks.

ChrisW67

I am assuming you using VNC to view the Ubuntu machines.

Is the Xvnc session starting a desktop that has a system tray? No tray, no tray icon.

Is there space for an icon, but no icon? Have you deployed the Qt SVG graphics plugin?

daria_is

Yes, of course, the Xvnc session desktop has a system tray.
The desktop looks exactly as when working directly on a machine.
Yes, there is a space for the icon in a system tray.

Yes, the Qt I'm using has a Qt SVG plugin. Also tray icon appear in NoMachine sessions and when running directly on the PC.

I found following logs in system journal when starting the application:

gnome-shell[2528]: Can't update stage views actor <unnamed>[<MetaWindowActorX11>:0x55f4ebb3fef0] is on because it needs an allocation.
gnome-shell[2528]: Can't update stage views actor <unnamed>[<MetaWindowGroup>:0x55f4ea784610] is on because it needs an allocation.
gnome-shell[2528]: Can't update stage views actor <unnamed>[<MetaSurfaceActorX11>:0x55f4ebb434d0] is on because it needs an allocation.
gnome-shell[2528]: Can't update stage views actor <unnamed>[<MetaWindowActorX11>:0x55f4ebb3f710] is on because it needs an allocation.
gnome-shell[2528]: Can't update stage views actor <unnamed>[<MetaWindowGroup>:0x55f4ea784610] is on because it needs an allocation.
gnome-shell[2528]: Can't update stage views actor <unnamed>[<MetaSurfaceActorX11>:0x55f4ebb434d0] is on because it needs an allocation.
gnome-shell[2528]: Can't update stage views actor <unnamed>[<MetaWindowActorX11>:0x55f4ebb3f710] is on because it needs an allocation.
gnome-shell[2528]: Can't update stage views actor <unnamed>[<MetaWindowGroup>:0x55f4ea784610] is on because it needs an allocation.
gnome-shell[2528]: Can't update stage views actor <unnamed>[<MetaSurfaceActorX11>:0x55f4ebb434d0] is on because it needs an allocation.
gnome-shell[2528]: Can't update stage views actor <unnamed>[<MetaWindowActorX11>:0x55f4ebb3f710] is on because it needs an allocation.
gnome-shell[2528]: Can't update stage views actor <unnamed>[<MetaWindowGroup>:0x55f4ea784610] is on because it needs an allocation.
gnome-shell[2528]: Can't update stage views actor <unnamed>[<MetaSurfaceActorX11>:0x55f4ebb434d0] is on because it needs an allocation.
gnome-shell[2528]: Can't update stage views actor <unnamed>[<MetaWindowActorX11>:0x55f4ebb3f710] is on because it needs an allocation.
nome-shell[2528]: Can't update stage views actor <unnamed>[<MetaWindowGroup>:0x55f4ea784610] is on because it needs an allocation.

ChrisW67

Does the tool tip text appear when you hover over the blank space where the icon should be?

daria_is

No, the tray behaves like there are no transparent icons

ChrisW67

Does the System Tray Icon Example fail in the same way?

daria_is

Seeing an error window "I couldn't detect any system tray on this system."