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Bug 2533

Summary:	Missing task bar on a laptop with a "part time" external monitor
Product:	TDE	Reporter:	Tim Williams <tmw>
Component:	system	Assignee:	Timothy Pearson <kb9vqf>
Status:	NEW ---
Severity:	normal	CC:	bugwatch
Priority:	P5
Version:	R14.0.x [Trinity]
Hardware:	amd64
OS:	Linux
Compiler Version:		TDE Version String:
Application Version:		Application Name:

Description Tim Williams 2015-09-29 09:03:09 CDT

Using a recently upgraded Mageia 5 installation.

When working for clients on-site, I will usually take my own laptop with me and plugin into an external monitor + keyboard while there. I have a script which automatically detects and extends the desktop to the external monitor when I log in. My task bar defaults to the external monitor when present and is shown on the laptop screen when there is no external monitor. This has been working perfectly for years.

However, after my latest upgrade, the taskbar no longer displays on the laptop screen if I boot up after having previously used the external monitor, making my desktop unusable.

The problem seems to be that the taskbar display is now "fixed" to whichever monitor it was last set to display on, regardless of whether that monitor is actually present or not. The external monitor output isn't actually being enabled due to a mis-detection, there is no signal output on the monitor port and the desktop has not been extended off the visible area of the laptop screen in any way.

At first I was able to cure this by plugging an external monitor in and dragging the task bar back to the correct screen before unplugging the monitor again. However, this technique is now failing as well!

While testing for this cause, after plugging in and activating the external monitor, the task bar flipped back to the laptop display, when I removed the monitor, the task bar vanished from the laptop display again! I tired leaving the monitor connected so that the task bar was on the correct screen and logging out/rebooting without the external monitor, but the task bar was missing again when I logged in. Even if I placed the task bar in a new position on the laptop screen (on the left side instead of the bottom), it vanishes again the moment I unplug the external monitor.

Stopping and starting the kicker process from the command line has no effect on the problem.

Right now the only work around I have for this problem is to do the following:

- Edit ~/.trinity/share/config/kickerrc
- Change the value of the XineramaScreen parameter to 0
- Kill and restart the kicker process