ubuntustudio-bugs team mailing list archive

[Dmitry Shachnev <mitya57@xxxxxxxxx>]

@Len, I could not reproduce it on my own system with Xfce installed, but
I can now reproduce it on Xubuntu daily CD.

According to D-Bus monitor, qjackctl doesn't even create a tray icon
before everything hangs.

Looking at the code, I suppose such behavior may be a result of this
call in src/qjackctl.cpp:

            XGrabServer(m_pDisplay);
            m_wOwner = m_pWidget->winId();
            XSetSelectionOwner(m_pDisplay, m_aUnique, m_wOwner, CurrentTime);

In this code, m_pWidget is hidden so has no winId, and calling
XSetSelectionOwner with m_wOwner=0 may result in blocked X11 session.
(Because of bad design of X11, apps can do that… In Wayland this isn't
possible).

I very much recommend to not use X11 API directly in Qt applications,
and use what Qt provides instead.

-- 
You received this bug notification because you are a member of Ubuntu
Studio Bugs, which is subscribed to Ubuntu Studio.
Matching subscriptions: UbuntuStudio Bugs, ubuntustudio-bugs: qjackctl
https://bugs.launchpad.net/bugs/1546328

Title:
  Systray option does not work.

Status in Ubuntu Studio:
  New
Status in qjackctl package in Ubuntu:
  Confirmed
Status in qtbase-opensource-src package in Ubuntu:
  Invalid

Bug description:
  Setting Qjackctl to "Enable system tray icon" does not display
  Qjackctl's icon and the menu provided by qjackctl from systray is
  blank. Further setting Qjackctl to "Start minimized to system tray"
  makes the application unusable.

  A reboot after Qjackctl to "Enable system tray icon" and  "Start
  minimized to system tray" are set, starting Qjackctl not only doesn't
  show Qjackctl's icon, but the mouse stops working correctly:

  The mouse moves ok, but does not have any hover effect or clicks so
  the menu no longer works and the only way to kill qjackctl is with
  control-alt-F1 (which does still work).

  Qjackctl is the main application used for controlling Jackd or
  jackdbus for those using any of the pro audio software.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: qjackctl 0.4.1-1ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-4.19-lowlatency 4.4.1
  Uname: Linux 4.4.0-4-lowlatency x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Tue Feb 16 14:30:46 2016
  InstallationDate: Installed on 2015-11-19 (89 days ago)
  InstallationMedia: Ubuntu-Studio 16.04 LTS "Xenial Xerus" - Alpha amd64 (20151118)
  SourcePackage: qjackctl
  UpgradeStatus: No upgrade log present (probably fresh install)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntustudio/+bug/1546328/+subscriptions