X Keyboard layout trouble

[Robert Latest <boblatest@googlemail.com>]

Hello all,

recently I re-activated my wife's 8-year-old laptop using debian
stable. The installation went of course quickly and hitch-free as
usual. However, what doesn't work correctly is the keyboard under X.
More precisely, the symbols accessed using the "Alt Gr" key produce
all sorts of characters, but not the much-needed []{}|. This is a
German Medion MD6100 (Aldi) laptop. I tried out several X keyboard
configurations, but they either didn't work at all or just as lousy.
The console (non-X) keyboard works fine.

By the way, I'm delighted about the performance Debian gets out of
this old veteran, even with a fully encrypted harddisk. Of course all
I use as X environment is dwm, I don't want to even think about what
this would look like with a full-blown Gnome or KDE desktop.

Thanks,
robert