I ran into the same issue and I worked it out. I figured I'd post what
I found to see if it helps.
There's really two issues and one was right in the man page for glslideshow.
From the man page:
---
-pan seconds
How long each pan-and-zoom should last. Default 6 seconds.
With the default settings of -pan 6 -duration 30, each image
will be displayed five times (30/6), and then a new image will
be loaded. If you want a new image to be loaded at each fade,
then set -pan and -duration to the same value.
---
This is the exact behavior I was seeing and sounds like what the other
users are describing... So I modified
'/usr/share/applications/screensavers/glslideshow.desktop' and set both
duration and pan to the same value and it appear to be doing the same
thing...
However, what I found was that when I tested by going to "Lock Screen"
it wasn't picking up the changes even though the screen saver
preferences panel did (System->Preferences->Screensaver). (Using
something that modifies the visual like '-fps' is helpful to see if
changes are being picked up or not.) What I had to do was restart gdm
after I modified the glslideshow.desktop file. The xscreensaver-demo
tool seemed to introduce uncertainty... Especially since the interface
provides sliders that don't show the exact set value, and as the man
page states above unless duration and pan are set to the same value the
"same image cycling" issue appears... So, I nuked the .xscreensaver
file in my home dir and added the 'imageDirectory:' parameter by hand.
Restarted GDM and everything works now.
Not really a bug, the system just does something different then what
(some) users expect.
I hope this helps.
--
glslideshow keeps showing the same image
https://bugs.launchpad.net/bugs/278941
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