Behavior confirmed on Tint2 panel on openbox.
% nm-tray
QSystemTrayIcon::setVisible: No Icon set
Then strace nm-tray and grep the output to find only lines containing
"access" and "pixmaps" and ".svg" and "No such file" shows these as missing
icons:
access("/usr/share/pixmaps/network-transmit.svg", F_OK) = -1 ENOENT (No
such file or directory)
access("/usr/share/pixmaps/network-wired-symbolic.svg", F_OK) = -1 ENOENT
(No such file or directory)
access("/usr/share/pixmaps/network-wired-disconnected-symbolic.svg", F_OK)
= -1 ENOENT (No such file or directory)
access("/usr/share/pixmaps/dialog-information.svg", F_OK) = -1 ENOENT (No
such file or directory)
access("/usr/share/pixmaps/view-refresh.svg", F_OK) = -1 ENOENT (No such
file or directory)
access("/usr/share/pixmaps/document-edit.svg", F_OK) = -1 ENOENT (No such
file or directory)
access("/usr/share/pixmaps/help-about.svg", F_OK) = -1 ENOENT (No such file
or directory)
access("/usr/share/pixmaps/application-exit.svg", F_OK) = -1 ENOENT (No
such file or directory)
access("/usr/share/pixmaps/network-offline.svg", F_OK) = -1 ENOENT (No such
file or directory)
access("/usr/share/pixmaps/network-wired-disconnected.svg", F_OK) = -1
ENOENT (No such file or directory)
I manually symlinked network-wired.svg and
preferences-system-network-symbolic.svg into /usr/share/pixmaps/ so I could
have some icons at least, that's why they don't appear in the strace above
