startx from 3.3.3.1-8

[Andreas Tille <tille@physik.uni-halle.de>]

Hello,

recently I upgraded to potato including XFree86 3.3.3.1-8 packages.
I wonder how to invoke startx to get 16 bpp.  Usually I did
  startx --bpp 16
but I get strange results when displaying certain images.  By the
way:  Is there any tool which shows information about the current
display stat (especially which color depth)?  Former the output
on stderr showed me, if I used 16 bpp but now this information seems
to be left out.  Moreover, do I have to change startx if I want to
set 16bpp as default color mode or is there a /etc/X11/* configuration
file responsible (if so which one and what to change there).
I think such really basic informations should be noticed under
/usr/doc/.  Or am I to stupid to find it there???

Kind regards

        Andreas.