I also got a tuner card. It worked under Arch, but not under Slackware. I still have yet to fix the problem.
]]>A few days later, I decided to reinstall Arch Linux, because it would feel cleaner. I burned CDs of DBAN 2.2.7 and the 4 January 2013 edition of the Arch install/rescue media, DBANned the hard drive, and reinstalled Arch. The CD drive kept throwing I/O errors, therefore I had to boot with the CD and then have a USB flash drive with the same install medium continue from there.
The nouveau driver works this time, therefore I now get the 1280*960 screen resolution in X again.
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