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the 'miscellaneous problems' entries on the common bugs page are catch-alls copy/pasted straight over from the f11 page; basically they're just standard bits of advice for configuration tweaking for people who do run into X issues. there are _always_ some X issues in any distro release, just too much hardware to support it all perfectly. In general F12 should have rather better graphics experiences for most users than F11.
Ah. O.K. Thanks.