Bug#570007: xkb-data: Keyboard doesn't work - Key events occur, but no Keysym is assigned

> Package: xkb-data
> Version: 1.7-2
> Severity: grave
> Justification: renders package unusable
>
> After updating to xserver 1.7.5, the keyboard doesn't work, if I start the xserver (it doesn't matter which window manager).
> I get the following output if I start the xserver: www.inf.tu-dresden.de/~s5569359/xstart.log
>
> xev shows, that the key press events are recognized, but there is no keysym found
> e.g. a and Enter: www.inf.tu-dresden.de/~s5569359/c
> I tried several keymaps. Executing xmodmap -pk while a xsession gives a normal key table.
>
> xinitrc and xsession are empty. libx11-6 and all orther related packages are uptodate.