I can confirm this bug, which also appears in my system.
My graphics card is an MGA G200 AGP, and the behaviour I get is that when GDM starts, my monitor goes into power-saving mode complaining that its maximum frequency has been reached. I double-checked the frequency ranges in /etc/X11/xorg.conf and they seem to be ok. In fact, they did not change from Dapper.
At the moment I am also using the VESA driver, with which I can only get a resolution of 800x600.
I can confirm this bug, which also appears in my system.
My graphics card is an MGA G200 AGP, and the behaviour I get is that when GDM starts, my monitor goes into power-saving mode complaining that its maximum frequency has been reached. I double-checked the frequency ranges in /etc/X11/xorg.conf and they seem to be ok. In fact, they did not change from Dapper.
At the moment I am also using the VESA driver, with which I can only get a resolution of 800x600.