Thanks to all who replied about this. The problem was solved by reducing the dot clock from 75.0 to 65.0. This gave a much better picture than I used to have before I upgraded xserver-svga.
-- Oliver Elphick [EMAIL PROTECTED] Isle of Wight http://www.lfix.co.uk/oliver PGP key from public servers; key ID 32B8FAA1 ======================================== "Lay not up for yourselves treasures upon earth, where moth and rust doth corrupt, and where thieves break through and steal; But lay up for yourselves treasures in heaven, where neither moth nor rust doth corrupt, and where thieves do not break through nor steal; For where your treasure is, there will your heart be also." Matthew 6:19-21