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Do you already have another Serverflags section in your xorg.conf? If so, you might need to add it there. Did you restart X after each attempt to make sure the config-file was re-read? Did it give any warnings (WW) that might've indicated that there was an error with the config file?
There was no other "Serverflags" section already existing. I restarted X each time so xorg.conf was re-read. When I tried the first one, nothing unusual happened, except that I was still able to switch virtual terminals as usual. When I tried the second, X wouldn't come up at all until I deleted those lines from xorg.conf with vi.
(WW) is the code X inserts in front of lines containing warnings in its logs. (EE) is the code for errors. Ordinarily, X.org will create a file like /var/log/Xorg.0.log with information about its startup procedure. You could check in there to see if it said anything about that option.