I don't have a solution, but...

575BT does not like 100MHz on my Dell Inspiron (Jean-Pierre Prieto)
Date: 1999, Nov 30
From: David Hinds <dhinds@pcmcia.sourceforge.org>

The mii-diag program on Donald Becker's web site at: http://cesdis.gsfc.nasa.gov/linux/diag will let you manipulate the transceiver settings. -- Dave

to: "I don't have a solution, but..."