Bug 360391

Created attachment 97835 [details]
Screenshot of what I get when I move the mouse to where the panel should pop up.

Can you confirm your Plasma version.

Also please attach your ~/.config/plasma-org.kde.plasma.desktop-appletsrc  as well as the output of xrandr -q

Also what if you try approaching the screen edge with various speeds?
Is there any velocity that would reliably show the panel?

Thanks for the follow-ups, guys. For plasma's version, let me know what specific commands I can help with. Here are the relevant packages:

plasma-breeze-5.5.4-1.fc23.x86_64
plasma-breeze-5.5.5-1.fc23.x86_64
plasma-breeze-common-5.5.4-1.fc23.noarch
plasma-breeze-common-5.5.5-1.fc23.noarch
plasma-desktop-5.5.5-1.fc23.x86_64
plasma-desktop-doc-5.5.5-1.fc23.noarch
plasma-milou-5.5.5-1.fc23.x86_64
plasma-pa-5.5.5-1.fc23.x86_64
plasma-pk-updates-0.2-7.20160216git.fc23.x86_64
plasma-systemsettings-5.5.5-1.fc23.x86_64
plasma-workspace-5.5.5-2.fc23.x86_64
plasma-workspace-common-5.5.4-2.fc23.x86_64
plasma-workspace-common-5.5.5-2.fc23.x86_64
plasma-workspace-drkonqi-5.5.5-2.fc23.x86_64
plasma-workspace-geolocation-5.5.5-2.fc23.x86_64
plasma-workspace-geolocation-libs-5.5.5-2.fc23.x86_64
plasma-workspace-libs-5.5.5-2.fc23.x86_64

Here's the xrandr output:

$ xrandr -q
Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 16384 x 16384
VGA-0 disconnected (normal left inverted right x axis y axis)
DVI-D-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 299mm
   1920x1080     60.00*+
   1280x1024     75.02    60.02
   1152x864      75.00
   1024x768      75.03    60.00
   800x600       75.00    60.32
   640x480       75.00    59.94
HDMI-0 disconnected (normal left inverted right x axis y axis)
DVI-D-1 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 531mm x 299mm
   1920x1080     60.00*+
   1280x1024     75.02    60.02
   1152x864      75.00
   1024x768      75.03    60.00
   800x600       75.00    60.32
   640x480       75.00    59.94

I'm attaching the Plasma config file.

Created attachment 97899 [details]
My ~/.config/plasma-org.kde.plasma.desktop-appletsrc

Martin, the problem is absolute ... speeds, directions, etc make no difference. Once the panel disappears, there's no way to get it back.

Any updates here? Anything I can help with? This still happens with the latest packets. By now I'm using:

plasma-breeze-5.5.5-3.fc23.x86_64
plasma-breeze-common-5.5.5-3.fc23.noarch
plasma-desktop-5.5.5-2.fc23.x86_64
plasma-desktop-doc-5.5.5-2.fc23.noarch
plasma-milou-5.5.5-1.fc23.x86_64
plasma-pa-5.5.5-1.fc23.x86_64
plasma-pk-updates-0.2-7.20160216git.fc23.x86_64
plasma-systemsettings-5.5.5-1.fc23.x86_64
plasma-workspace-5.5.5-4.fc23.x86_64
plasma-workspace-common-5.5.5-4.fc23.x86_64
plasma-workspace-drkonqi-5.5.5-4.fc23.x86_64
plasma-workspace-geolocation-5.5.5-4.fc23.x86_64
plasma-workspace-geolocation-libs-5.5.5-4.fc23.x86_64
plasma-workspace-libs-5.5.5-4.fc23.x86_64

Folks, I've figured out what's going on here. It looks like by default, screen edges are disabled in KDE 5 (System Settings -> Desktop Behavior -> Screen Edges -> Switch desktop on edge). Once you enable desktop switching, the panel no longer pops up. If you disable it, the panel appears again.

Looks like the edge detection logic collides with the panel trigger logic. Note that my virtual desktops are aligned horizontally and my panel is at the bottom, so there's no switching to do when I go near the panel.

Anyway, case closed from my side, but a fix for this would obviously be welcome.

It is the same mechanism that does Plasma panels. 

Thanks

I'll look into a fix.

duplicate of https://bugs.kde.org/show_bug.cgi?id=370964

*** This bug has been marked as a duplicate of bug 370964 ***