I've never tried Sabayon but it seems it would be easy to accomplish. They probably include proprietary drivers as well as open source ones in the distribution and through hardware detection install the proper ones for your card, and put an appropriate xorg.conf in place as well. It basically comes down to writing a small script that, based on the outcome of hardware detection, runs a few simple commands you would normally run yourself. I prefer doing this manually but I will admit their modus operandi is easier or more "seamless" from the user's perspective.
Ubuntu doesn't include certain drivers by default for what I'd call ideological reasons, and if you cannot live with that one time annoyance of enabling the repos for proprietary drivers it is probably best to move to a different distro. It's all based on the position that it's not enough to use some free software but one should strive to use free software exclusively.
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