Bug#487633: Found probably the reason for the problem
It seems to be a conflict to installed files of the nVidia driver.
I had installed the current version NVIDIA-Linux-x86-173.14.05 and after a
sanity test it reports:
| WARNING: Your driver installation has been altered since it was initially
| installed;
| ERROR: File '/usr/lib/xorg/modules/extensions/libglx.so' is not a symbolic
| link.
After re-installing the nVidia driver I got the GL screensavers back.
Examined in a next step the
folder '/usr/lib/xorg/modules/extensions/libglx.so' before and after the
driver installation.
Before:
~~~~~~
| -rw-r--r-- 1 root root 429042 21. Jun 23:48 libglx.so
| -rwxr-xr-x 1 root root 1269664 16. Jun 11:23 libglx.so.173.14.05
After:
~~~~~
| lrwxrwxrwx 1 root root 19 25. Jun 08:50 libglx.so ->
| libglx.so.173.14.05
| -rwxr-xr-x 1 root root 1269664 25. Jun 08:50 libglx.so.173.14.05
So it seems that the installation of the latest xserver-xorg-core has
overwritten the link with a same named file, the previous link is brooken now
to the nVidia driver and the GL screensavers (and maybe other GL-related
things too) are no longer working.
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