Bug#233653: that's ok today
Yeeeees! Recent update to xfree86 solved the problem.
klecker:~$ sudo apt-get -u dist-upgrade
Reading Package Lists... Done
Building Dependency Tree... Done
Calculating Upgrade... Done
The following packages will be REMOVED:
The following NEW packages will be installed:
The following packages have been kept back:
The following packages will be upgraded:
alsa-base alsa-utils base-config bogofilter capplets capplets-data console-common console-data cvs debconf debconf-doc debconf-i18n
debconf-utils debmake deborphan euro-support euro-support-console euro-support-x file gnome-control-center imagemagick jade
libasound2 libdb2 libdb2-util libdbi-perl libgnome2-0 libgnome2-common libmagic1 libmagick++6 libmagick6 libqt3-compat-headers
libqt3-headers libqt3c102-mt libsdl1.2debian libsdl1.2debian-oss libsp1 lilo logrotate octave2.1 octave2.1-doc octave2.1-htmldoc
octave2.1-info qt3-dev-tools sed sp ttf-freefont whois wmressel xlibmesa-gl-dev xlibmesa-glu-dev xscreensaver
52 upgraded, 2 newly installed, 2 to remove and 1 not upgraded.
Need to get 0B/30,9MB of archives.
After unpacking 9586kB disk space will be freed.
Do you want to continue? [Y/n]
Francesco P. Lovergine