Re: 1.0.9629 reverting to legacy pci mode (?); no glxgears
Setting NvAGP to 0 in xorg.conf solved the problem with the initial blank screen and glxgears. I read some earlier posts where you suggested that option and thought I tried it, but apparently not. I am still unable to cycle through the resolutions using CTRL-ALT-+, but this is not critical and I'll look into it a bit myself before asking you for more help.
Thank you very much for your quick response!