I have an ATI X1650 video card, attached to two monitors. The secondary monitor is a Hitachi CM751 CRT, which previous versions of Fedora have driven at a 75Hz refresh rate at the maximum 1600x1200 resolution.
After installing the Fedora 15 Beta on this computer, the Plymouth boot screen comes up with a 75Hz refresh rate. Once the login screen shows, however, the monitor gets shifted back to a 60Hz refresh rate, and stays there through several screen flickers (looking at the Xorg.0.log file, it appears these are due to EDID probes). The DDC-gathered modelines in the file include the VESA-standard 1600x1200@75Hz modeline, so I'm at a bit of a loss as to why that mode is not selected when I ask for the 1600x1200 resolution in the display settings tool.
Anyone have any ideas for how to get this mode to work? 60Hz really strains my eyes after a while, so it's pretty hard to work with it this way.
The LCD on the other head, I should add, has a max refresh rate of 60Hz in the same 1600x1200 mode, so I'm worried that somehow that setting is getting used for the CRT. But again, as I said, previous versions of Fedora have done fine with this setup, so I'm sure there's some way to make it work.
I've attached my Xorg.0.log in case this would help.
Thanks in advance,