Bug#297001: Instaalation screen becomes scrumbled after switching to another VC and back

["RG.Schneider@t-online.de" <RG.Schneider@t-online.de>]

Package: Debian-installer
Version:   Current Sarge

Problem:

If one starts the installation of current Sarge release ( either from
custom DVD -Linux Magazin - or from the CD #1 from debian server )
the installation screen ( Virtual Console #1 ) becomes scratched after
activating another VC and switching back to VC #1 ( Installation screen
). E.G.: Press keys <Alt-F3> <enter> to activate root console on 3rd VC.
      Then <Alt-F1> to return to installation screen.
The sccren becomes unreadable ( stripes from top to bottom ) and no
restoration possible.

This does NOT happen when FBconsole is started ( using the "vga=791"
kernel boot prompt parameter) .

/RalfS