xserver-xfree86

On Debian this package configures the X11 system. In case you want to reconfigure it, the command

$ dpkg-reconfigure xserver-xfree86

has to be run. So far that's quite simple but to be able to write, MD5 files must exist in /var/lib/xfree86 for the following files:

• /etc/X11/X
• /etc/X11/Xwrapper.config
• /etc/X11/XF86Config-4

Make sure, you specify the path when creating the files! Otherwise writing will still be impossible.

You can create the necessary MD5 sums by running

for FILE in /etc/X11/X /etc/X11/Xwrapper.config /etc/X11/XF86Config-4; do
  md5sum ${FILE} > /var/lib/xfree86/${FILE##*/}.md5sum;
done

Solaris 10 (on Intel) was not able to use any other solution than 640×480. The solution to get this running was to execute /usr/X11/bin/xorgconfig and to configure X11 this way.

Afterwards the solution selector works like it's expected to.