A user at DebianHelp.org suggested I try the Matrox driver from Matrox. Earlier I did a compile from Debian sources at sarge1 release level and it did not resolve the problem. I worked in vesa mode for a couple of days before installing the Matrox proprietary driver, which resolves the issue for me. However I believe mga driver was working without this driver from Matrox prior to the update.
See this thread for some potential leads on what nm tracing revealed: http://www.debianhelp.org/node/1603#comment-1225 --Donald Teed -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]